PowerPoint, ArcaneDoor, the Z80 and Kaiser Permanente
Notable security news from the week of April 21st with a small side of nostalgia for the Z80 CPU; we'll dive into the exploitation of an old PowerPoint CVE from 2017, ArcaneDoor and the targeting of Cisco perimiter devices and an enormous breach of Kaiser Permanente user information!Dell & TicketMaster breaches, CVE & patch roundup and ProxyShell is back
Notable security news for the week of May 20th-26th, 2024, brought to you by the F5 Security Incident Response Team. This week, AaronJB is taking a look at breach news from Dell, a novel DNS attack technique, how threat actors still exploit old CVEs (like Exchange's ProxyShell CVE-2021-34473, CVE-2021-34523 & CVE-2021-31207), why Industrial Control Systems shouldn't be connected to the Internet and a quick round-up of vendor patches you should take a look at from Ivanti, Fortinet, TP-Link and F5. Huge breaches, still in fashion I originally had this segment planned so that I could talk about the recentDell data breach which exposed the records of 49 million customers- name,physical address, Dell order information - you know, the usual kind of information that an adversary could use to construct averyconvincing spearphishing attack (yet Dell consider low risk, apparently); but there is some late breaking news which potentially makes this breach look tiny. I'll get onto that later. The Dell breach is interesting though as it was actually achieved using one of the most basic techniques (which I thought was long since 'fixed') - web scraping. The attackers simply registered a partner account using fake company details and then used a generated list of service tags to scrape the details of every order relating to those service tags - they sent 5000 requests per minute for three weeks straight, and nobody noticed a thing. Dell Service Tags are a unique asset identifier consisting of seven alphanumeric digits - consider them a serial number - so the attackers just needed to generate every possible combination of service tag and then, one by one, request the details of the order behind that tag. Apparently, the attackerseven tried to disclose this security issue to Dell, but received no response and set about monetizing their discovery instead. It strikes me that there are so many places this could have been fixed ahead of time: Least privilege: Doeseverypartner accountreallyneed to be able to access the details ofeverypossible service tag? (I would have thought no!) Rate limiting: Does that APIreallyneed to be able to support endless requests from a single partner account? (I would have thought no!) Logging: I don't know what the base requests-per-second rate is for that API, but shouldn't there at least have been some logging happening to a central SIEM about suspicious activity? Any of the above could have stopped this attack dead - heck, I get the impression that Dell could have stopped the attack had they interacted with the original report sent to them; though perhaps the original report (in part redacted) was looking for a bounty and Dell declined to interact on such basis. Still, the published partial email does seem to indicate that the attackers provided a full PoC from the outset.. But wait, I said there was something bigger? Yes! This is late breaking and we don't have all the facts yet, but a couple of days ago posts began appearing on X suggesting thatTicketMaster had suffered a breachof1.3TBof data which included names, physical addresses, email addresses, phone numbers andthe last four digits and expiryof payment cards associated with orders - 560 million rows of data. The validity of this wasinitially questionedbut, unfortunately for us,later verified to be true; as vx-underground says: Sometime in April an unidentified Threat Group was able to get access to TicketMaster AWS instances by pivoting from a Managed Service Provider. At least this wasn't a simple web scraping attack, I suppose, but it highlights something for me: You need to beverycareful who you trust to manage your systems, becauseyoursecurity is entirely intheirhands. Meanwhile, your reputation is entirely in your hands - when and if you are breached, your customers won't come with pitchforks for your MSP, they will come foryou. This is also true of SaaS services, of course, and why SaaS companies (including ours) invest heavily in internal training, processes and patch management.. I wonder if the MSP did, in this case? Vendor patch watch It's like Spring Watch (for UK readers; for the rest of the world, that's a daytime TV show where cameras get shoved in badger sets, bird houses etc and people watch baby animals that were born in springtime), but for vulnerabilities.. Ivanti published patches forsixCritical severity vulnerabilities (plus four High)in Ivanti EPM, and a handful of other Ivanti products; if you use any of those youreallyshould patch ASAP, although none have appeared inCISA's Known Exploited Vulnerabilities (KEV) listyet. Proof of Conceptexploits were released for Fortinet's CVE-2024-23108(disclosed in January) so if you haven't patched, you absolutely must as the time from PoC availability to widespread exploitation is typically 24 hours or less. Rather unfortunately, the PoC reveals that CVE-2024-23108 is basically CVE-2023-34992 just in a different argument - still, we have all been there! TP-Link discloseda CVSS10.0 vulnerability in their Archer C5400Xgaming router and if you have one of those then you really need to patch - home routers are common targets for attackers looking to create botnets to carry out further attacks, andearlier TP-Link CVEs quickly appeared in CISA's KEV listas well asF5 Labs' Sensor Intel Serieswhich showed that CVE-2023-1389 (TP-Link Archer AX-21) wasthe most targeted vulnerabilityin March 2024! Finally, and not to be outdone, F5 had two disclosures in May; this is unusual for us as we typically coordinate our disclosures for Quarterly Security Notifications however, this month, we had both a QSN and an Out-of-Band notification affecting NGINX products. You can find the details of our May 8th QSN inK000139404and details of our NGINX-specific May 29th OOBSN inK000139628; fortunately for us the highest CVSS in our QSN was an 8.0, and in our OOBSN a 6.5 (and the OOBSN NGINX issues are all specific to QUIC, as well). As I say, we try to coordinate our disclosures for QSNs so that our customers can have a predictable cadence around which to plan updates & upgrades; we are committed to security, to working with external researchers, and to the security of the open-source community however, and in some cases we must disclose issues out of band in order to best protect and serve our customer base, and maintain the balance between transparency and security. Novel DNS attack - DNSbomb DNSbomb- I originally spotted this a couple of weeks ago, but last week it was the topic of a talk at the2024 IEEE Symposium on Security and Privacyso has had a bit more coverageandthere is now an easy-to-digestslide setavailable (with a video to follow) and even a one-pageposterfor your wall (seriously though, I actually love the idea of a one-page poster like this for new research; it's great for those of us who are attention-span challenged!). The idea behind this attack is to use a low-rate of requests from a large number of hosts to fly under the radar, but rather than simply having those hosts query the target victim, those hosts send their queries to some intermediary concentrator (which could be a recursive resolver, CDN or similar) which will queue all of those requests up and send them in one big burst to the target victim (hence the "bomb" part of the name). The technique is interesting and novel, promising a theoretical amplification factor of 20,000x or greater and a peak "bomb" in the 9Gb/s range, but I have to admit that I haven't been able to properly go through the research paper or try to replicate their findings yet. Perhaps that will be the basis of a future DCCO article! If anyone has had chance to really understand the research - or better still, was at the IEEE Symposium - I'd love to hear from you! Don't put your Industrial Control Systems on the Internet? I thought this fell under the heading of "obvious news" but apparently, not so obvious;Rockwell Automation and CISAhave "encouraged" customers to assess and secure their public internet exposed ICS assets. Personally I'm struggling to understand why Industrial Control Systems would be exposed to the Internet, ever, but perhaps I am being naieve here? Is the public internet just considered "easy connectivity" for ICS & IoT systems? Certainly a quick google for things like "water treatment plant internet" shows plenty of articles discussing IoT for waste treatment monitoring, but do you really want the gate valves separating brown water from clean being controlled by a PLC hooked up to the Internet? OK, silly example, but my point stands - industrial controls typically look after things that are mission- or human-critical; toxic waste, nuclear power stations, manufacturing plants and so on.Noneof that stuff shouldeverbe connected to the internet, and it terrifies me that Rockwell & CISA felt the need to reiterate that... One last thing.. An article about MS Exchange flaws being leveraged todeploy keyloggers in highly targetted attacks. What caught my eye there wasn't the keylogger part (although thatisneat; at least neat to see something that isn't just ransomware!) but rather that the threat actor is leveraing Exchange vulnerabilities from2021in the form of ProxyShell (CVE-2021-34473, CVE-2021-34523, and CVE-2021-31207). I talk about this often, but as an industry wehaveto get better at patching exposed systems; perhaps the problem is we simply don't know what systems are exposed, perhaps the problem is a lack of time to patch, or a lack of corporate will to suffer potential downtime and push-back by Change Advisory Boards, but whatever the problem is we really have to tackle it. I'd love to hear your stories from the front lines of patching things like ProxyShell; how long did it take, was there any fallout, management push-back etc? Ancient Exchange flaws exploited -https://thehackernews.com/2024/05/ms-exchange-server-flaws-exploited-to.htmlGhostStripe, Sec Clearance bill, JR EAST, Vulnrichment, and Solar Storm
This weekKoichi is back as editor for another round-up of the news. This time I chose these security news: GhostStripe, Security Clearance bill, and RISS, Suspected attack on Japan Railway (JR) East, Vulnrichment; and Solar Storm.InSpectre, Rust/PANOS CVEs, X URL blunder and More-April 8-14, 2024-F5 SIRT-This Week in Security
Editor'sIntroduction Hello, Arvin is your editor for This Week in Security. As usual, I collected some interesting security news. Credit to the original articles. Intel processors are affected by a Native Branch History Injection (Native BHI) attack and the tool InSpectre, a tool that can find gadgets (code snippets that can serve as a jumping point to bypass sw and hw protections) in an OS kernel on vulnerable hardware. Spectre style attacks that abuses speculative execution on processors has been around for a while now. Intel updated their previous published article on "Branch History Injection and Intra-mode Branch Target Injection" guidance and included an "Additional Hardening Options" section. The silver lining in this, is the CVEs CVSS score are Medium severity. See the section snippets from the research paper of the researchers from VU Amsterdam that illustrates the use InSpectre tool. Rust has a critical CVE - CVE-2024-24576. It affects the Rust standard library, which was found to be improperly escaping arguments when invoking batch files on Windows using the library's Command API – specifically, std::process::Command. It is specific to the Windows OS cmd exe as it has complex parsing rules and allowed untrusted inputs to be safely passed to spawned processes. Next is a PAN OS Critical CVE, where it affects devices with firewall configurations with GlobalProtect gateway and device telemetry enabled. CVE-2024-3400 affects PAN-OS 10.2, PAN-OS 11.0 and PAN-OS 11, Updates to fully fix this CVE were made available from April 14. Refer tohttps://security.paloaltonetworks.com/CVE-2024-3400 Change Healthcare's worries on effects of a previous breach due to ALPHV ransomware group appears to be not over. Per the report, the victim organization was potentially "exit" scammed by ALPHV and is being pursued by the "contactor/affiliate" of the ransomware attack, RansomHub, demanding another round of ransom to be paid, else, they sell the exfiltrated data to the highest bidder. X/Twitter had an URL blunder where it converts anything with the string twitter in their site's tweets and then converts it to the letter X - example, netflitwitter[.]com will be converted to netflix[.]com. This behavior was reversed and back to usual, but X twitter[.]com URLs now properly converts to X[.]com. Lastly, a round up of issues from MS, Fortinet, SAP, Cisco, Adobe, Google/Android. As in previous TWIS editions, some of these news were a recurrence/follow up. In general, keep your systems up to date on software versions, secure access to them and allow only trusted users and applications to run. Implement layers of protections - updated AV/ED/XDR on Server and End User systems, Firewall/network segmentation rules/IPS to prevent further spread/lateral movement in the event of a ransomware attack (BIG-IP AFM have network firewall, IPS features that you can consider), a WAF to protect your web applications and APIs - BIG-IP ASM/Adv WAF, F5 Distributed Cloud Services, NGINX App Protect have security policy configuration and attack signatures that can mitigate known command injection techniques and other web exploitation techniques. End user security training and awareness, incident response and reporting will help an organization should that first phishing email reaches a target end user mailbox. If it feels "off" and looks suspicious, stop and ponder before clicking. I hope this edition of TWIS is educational. You can also read past TWIS editions and othercontent from the F5 SIRT , so check those out as well. Till next time! Rust rustles up fix for 10/10 critical command injection bug on Windows in std lib Programmers are being urged to update their Rust versions after the security experts working on the language addressed a critical vulnerability that could lead to malicious command injections on Windows machines. The vulnerability, which carries a perfect 10-out-of-10 CVSS severity score, is tracked as CVE-2024-24576. It affects the Rust standard library, which was found to be improperly escaping arguments when invoking batch files on Windows using the library's Command API – specifically, std::process::Command. "An attacker able to control the arguments passed to the spawned process could execute arbitrary shell commands by bypassing the escaping," said Pietro Albini of the Rust Security Response Working Group, who wrotethe advisory. The main issue seems to stem from Windows' CMD.exe program, which has more complex parsing rules, and Windows can't execute batch files without it, according to the researcher at Tokyo-based Flatt Security whoreported the issue. Albini said Windows' Command Prompt has its own argument-splitting logic that works differently from the usual Command::arg and Command::args APIs provided by the standard library, which typically allow untrusted inputs to be safely passed to spawned processes. "On Windows, the implementation of this is more complex than other platforms, because the Windows API only provides a single string containing all the arguments to the spawned process, and it's up to the spawned process to split them," said Albini. "Most programs use the standard C run-time argv, which in practice results in a mostly consistent way arguments are split. "Unfortunately it was reported that our escaping logic was not thorough enough, and it was possible to pass malicious arguments that would result in arbitrary shell execution." https://www.theregister.com/2024/04/10/rust_critical_vulnerability_windows/ It's 2024 and Intel silicon is still haunted by data-spilling Spectre Intel CPU cores remain vulnerable to Spectre data-leaking attacks, say academics at VU Amsterdam. We're told mitigations put in place at the software and silicon level by the x86 giant to thwart Spectre-style exploitation of its processors' speculative execution can be bypassed, allowing malware or rogue users on a vulnerable machine to steal sensitive information – such as passwords and keys – out of kernel memory and other areas of RAM that should be off limits. The boffins say they have developed a tool called InSpectre Gadget that can find snippets of code, known as gadgets, within an operating system kernel that on vulnerable hardware can be abused to obtain secret data, even on chips that have Spectre protections baked in. InSpectre Gadget was used, as an example, to find a way to side-step FineIBT, a security feature built into Intel microprocessors intended to limitSpectre-stylespeculative execution exploitation, and successfully pull off a Native Branch History Injection (Native BHI) attack to steal data from protected kernel memory. "We show that our tool can not only uncover new (unconventionally) exploitable gadgets in the Linux kernel, but that those gadgets are sufficient to bypass all deployed Intel mitigations," the VU Amsterdam teamsaidthis week. "As a demonstration, we present the first native Spectre-v2 exploit against the Linux kernel on last-generation Intel CPUs, based on the recent BHI variant and able to leak arbitrary kernel memory at 3.5 kB/sec." https://www.theregister.com/2024/04/10/intel_cpus_native_spectre_attacks/ fromhttps://download.vusec.net/papers/inspectre_sec24.pdf 2.2 Spectre v2 In 2018, the disclosure of Spectre [29] famously demonstratedhow speculation can be used to leak data across security domains. One variant presented in the paper, originally known asSpectre v2 or Branch Target Injection (BTI), shows how speculation of indirect branches can be used to transiently divertthe control flow of a program and redirect it to an attackerchosen location. The attack works by poisoning one of theCPU predictors, the Branch Target Buffer (BTB), which isused to decide where to jump on indirect branch speculation. Initially, mitigations were proposed at the software leveland, later, in-silicon mitigations such as Intel eIBRS [5] anARM CSV2 [12] were added to newer generations of CPUsto isolate predictions across privilege levels. 2.3 Branch History Injection In 2022, Branch History Injection (BHI) [13] showed that,despite mitigations, cross-privilege Spectre v2 is still possibleon latest Intel CPUs by poisoning the Branch History Buffer(BHB). Figure 1 provides a high-level overview of the attack. In summary, by executing a sequence of conditionalbranches (HA and HV ) right before performing a system call,an unprivileged attacker can cause the CPU to transientlyjump to a chosen target (TA) when speculating over an indirect call in the kernel (CV ). This happens because the CPUpicks the speculative target forCV from a shared structure, theBTB, that is indexed using both the address of the instructionand the history of previous conditional branches, which isstored in the Branch History Buffer (BHB). Finding the rightcombination of histories that will result in a collision can bedone with brute-forcing.To ensure the injected target, TA, contains a disclosure gadget, the original BHI attack relied on the presence of theextended Berkeley Packet Filter (eBPF), through which anunprivileged user can craft code that lives in the kernel. Figure 2: InSpectre gadget workflow. The analyst provides akernel image and a list of target addresses to InSpectre Gadget⃝1 , which performs in-depth inspection to find gadgets thatcan leak secrets and output their characteristics. The gadgetscan be filtered ⃝2 based on the available attacker-controlledregisters and the mitigations enabled, and used to craft Spectrev2 exploits against the kernel ⃝3 . Zero-day exploited right now in Palo Alto Networks' GlobalProtect gateways Palo Alto Networks on Friday issued a critical alert for an under-attack vulnerability in the PAN-OS software used in its firewall-slash-VPN products. The command-injection flaw, with an unwelcome top CVSS severity score of 10 out of 10, may let an unauthenticated attacker execute remote code with root privileges on an affected gateway, which to put it mildly is not ideal. It can, essentially, be exploited to take complete control of equipment and drill into victims' networks. Updates to fully fix this severe hole are due to arrive by Sunday, April 14, we're told. CVE-2024-3400affects PAN-OS 10.2, PAN-OS 11.0 and PAN-OS 11.1 firewall configurations with a GlobalProtect gateway and device telemetry enabled. Cloud firewalls, Panorama appliances, and Prisma Access are not affected, Palo Altosays. Zero-day exploitation of this vulnerability was detected on Wednesday by cybersecurity shop Volexity, on a firewall it was monitoring for a client. After an investigation determined that the firewall had been compromised, the firm saw another customer get hit by the same intruder on Thursday. "The threat actor, which Volexity tracks under the alias UTA0218, was able to remotely exploit the firewall device, create a reverse shell, and download further tools onto the device," the networks security management firm said in ablog post. "The attacker focused on exporting configuration data from the devices, and then leveraging it as an entry point to move laterally within the victim organizations." The intrusion, which begins as an attempt to install a custom Python backdoor on the firewall, appears to date back at least to March 26, 2024. Palo Alto Networks refers to the exploitation of this vulnerability as Operation MidnightEclipse, which at least is more evocative than the alphanumeric jumble UTA0218. The firewall maker says while the vulnerability is being actively exploited, only a single individual appears to be doing so at this point. mitigations include applying a GlobalProtect-specificvulnerability protection, if you're subscribed to Palo Alto's Threat Prevention service, or "temporarily disabling device telemetry until the device is upgraded to a fixed PAN-OS version. Once upgraded, device telemetry should be re-enabled on the device." It urged customers to follow the above security advisory and thanked the Volexity researchers for alerting the company and sharing its findings. ® https://www.theregister.com/2024/04/12/palo_alto_pan_flaw/ https://www.volexity.com/blog/2024/04/12/zero-day-exploitation-of-unauthenticated-remote-code-execution-vulnerability-in-globalprotect-cve-2024-3400/ https://unit42.paloaltonetworks.com/cve-2024-3400/ Change Healthcare faces second ransomware dilemma weeks after ALPHV attack Change Healthcare is allegedly being extorted by a second ransomware gang, mere weeks after recovering from an ALPHV attack. RansomHub claimed responsibility for attacking Change Healthcare in the last few hours, saying it had 4 TB of the company's data containing personally identifiable information (PII) belonging to active US military personnel and other patients, medical records, payment information, and more. The miscreants are demanding a ransom payment from the healthcare IT business within 12 days or its data will be sold to the highest bidder. "Change Healthcare and United Health you have one chance in protecting your clients data," RansomHub said. "The data has not been leaked anywhere and any decent threat intelligence would confirm that the data has not been shared nor posted. The org is alleged to have paid a $22 million ransom to ALPHV following the incident – a claim made by researchers monitoring a known ALPHV crypto wallet and one backed up by RansomHub. However, Change Healthcare has never officially confirmed this to be the case. If all of the claims are true, it means the embattled healthcare firm is deciding whether to pay a second ransom fee to keep its data safe. the prevailing theory among infosec watchers is that ALPHV pulled what's known as an exit scam after Change allegedly paid its ransom. While the ratios vary slightly between gangs, generally speaking, ransomware payments are split 80/20 – 80 percent for the affiliate that actually carried out the attack and 20 percent for the gang itself. It's believed that ALPHV took 100 percent of the alleged payment from Change Healthcare, leaving the affiliate responsible for the attack without a commission. Angry and searching for what they believed they were "owed," the affiliate is thought to have retained much of the data it stole and now switched allegiances to RansomHub in one last throw of the dice to earn themselves a payday, or so the theory goes. UnitedHealth, parent company of Change Healthcare,discloseda cybersecurity incident on February 22, saying at the time it didn't expect it to materially impact its financial condition or the results of its operations. It originally suspected nation state attackers to be behind the incident, but the ALPHV ransomware gang later claimed responsibility. Many of its systems were taken down as a result while it assessed and worked to remediate the damage. Hospitals and pharmacies reported severe disruption to services following the attack, with many unable to process prescriptions, payments, and medical claims. Cashflow issues also plagued many institutions, prompting the US government tointervene. The IT biz's data protection standards are soon to be subject to aninvestigationby the US healthcare industry's data watchdog, which cited the "unprecedented magnitude of this cyberattack" in its letter to Change. https://www.theregister.com/2024/04/08/change_healthcare_ransomware/ X fixes URL blunder that could enable convincing social media phishing campaigns Elon Musk's X has apparently fixed an embarrassing issue implemented earlier in the week that royally bungled URLs on the social media platform formerly known as Twitter. Users started noticing on Monday that X's programmers implemented a rule on its iOS app that auto-changedTwitter.comlinks that appeared in Xeets toX.com links. Attackers could feasibly copy legitimate web pages to steal credentials, or skip the trouble and simply use it as a malware-dropping tool, or any number of other possibilities. The potential for abuse here would be rife, given the number of legitimate, well-known brands most people would blindly trust. Netflix, Plex, Roblox, Clorox, Xerox – you get the picture. According to tests at Reg towers on Wednesday morning, the issue appears to have been reversed. Netflitwitter[.]com now reads as such, but Twitter.com is auto-changed to X.com.
Maintainers, Slowloris/2, Kobold Letters - April 1st - 7th, 2024 - F5 SIRT - This Week in Security
Introduction Hello again, Kyle Fox here. This week we have some shorter bits about things, in which I promise two more future articles, which I think means I am up to three non-TWIS articles in the pipeline. We have to talk about project maintainers again. We have all seen that one XKCD comic about dependency maintainers. The xz situation has resurfaced a common plea from Open Source maintainers: We need funds and help. I don't have any real deep commentary here, just a plea that companies heavily dependent on Open Source projects should consider giving back to the community by retaining internal SMEs who can help projects resolve issues by submitting bug fixes, contribute to those projects financially, and possibly consider hiring internal people to work on the major features they want out of these projects. Platforms like GitHub may be able to help by moderating discussions to keep project maintainers from being abused by users. And the community should work better at being a positive force for change. And the same goes for conferences, some of us spend lots of time working on all the little details so you can go to DEF CON, have parties to go to, things to hack and places to hack them in. Its easy to look at something like DEF CON and think that its just another industry conference and everyone is being paid to be there, but very few people are paid to be there. I will further discuss this soon in a post about the current DEF CON situation and venues. Is the HTTP/2 CONTINUATION Attack Just Slowloris/2? On April 3rd the industry got wind of a new attack on HTTP/2, this time you could consume resources by sending a steady stream of CONTINUATION frames, leaving the connection open and consuming resources. This came on the tail end of the HTTP/2 Rapid Reset attack, which consumed resources in an orthogonal way. If this attack sounds familiar, its because it is almost the same attack for HTTP/2 as the Slowloris attack was for HTTP/1.1. You could also compare it to the Slow POST attack as well. How Slowloris worked, for those who may have forgotten since 2009, is the attacker will send a HTTP/1.1 request to a webserver and then slowly send one header at a time, holding the connection open for a very long time with limited traffic. On susceptible webservers they would only need to send headers fast enough to keep the TCP connection from timing out, since the webserver does not have a timeout for the header stage of the request. The Slow POST attack is similar, but slowly sending chunks of POST data rather than headers, relying on the webserver not timing out on those. BIG-IP mitigated Slowloris by its normal behavior of buffering all the headers before forwarding a request to the backend servers. A limit on the number and/or size of headers allows further refinement of this mitigation. When mitigated, these attacks only generate at most an open connection on the backend with no request. This same behavior mitigated the HTTP/2 Rapid Reset attack and now mitigates the HTTP/2 CONTINUATION attack. As we can see from this, old attacks can become new ones when a new or significantly revised protocol comes along. This is why when working on new features F5 performs Threat Modelling Assessments to categorize possible new variations of old attacks or completely new attacks that may apply to a new feature, protocol or service and build in protections against those attacks. Display: none Strikes Again, Now in Email. A recent post over at Lutra Security called Kobold Letters has resurfaced an old trick with CSS, but this time in email. The basic TL;DR of this trick is using display: none attached to CSS in an email to hide text in the email until its forwarded or replied to. Email clients often will convert an email to plain text or try to convert the HTML and CSS slightly. This results in the ability to put blocks of text in divs or other selectable blocks that can be styled in CSS to hide them or otherwise change their display and appearance when they are forwarded or replied to. I don't know if this really changes much in the spear-phishing risk area, at this point organizations should have considerable controls in places to make sure that fund transfers are only acted on with clear verified approval and that the destinations of fund transfers are vetted and verified, not copied from some email and sent without checking. Fortunately in this case the vendors have been informed and they are working to provide solutions to this attack, so it may not be viable for very long. Are Bluetooth Discovery Attacks Drying Up? I don't have much to write here since I have not yet dove into the data that much, but the Bluetooth Discovery attacks that I talked about in December appear to not be as popular as they once were. I used Wall-of-Flippers at a few conventions in March to collect Flipper and Bluetooth Discovery Spam data, but it appears that not a whole lot of spamming was happening. Apple and Google Android have been working on mitigating these attacks, Apple having released several iOS updates to patch it. The lack of impact these days may be driving this trend. I do intend on bringing the Wall-of-Flippers to more events, and will be doing a bigger writeup on the device, the software and the data collected here on DevCentral in the coming month or two. Roundup Not a channel this time, but a single video by TwinkleTwinkie: Understanding & Making PCB Art. Google to delete records made from users using Incognito Mode in lawsuit settlement. Microsoft has announced how much it will cost to keep Windows 10 past the date they want you to move to Windows 11. No word on a better Windows 11 UI. Fake AI lawfirms are sending DMCA takedowns to generate SEA gains. (Original report) A recommendation from my recent trip to Las Vegas: Roberto's Taco Shop. Wi-Fi only works when its raining. This is a lesson in sometimes the observations, while absurd, are correct. Roku wants to insert ads in HDMI inputs? DEF CON now has hotel blocks at the Sahara Las Vegas, The Fontainebleau Las Vegas and Resort World.
