After a week away recovering from too much turkey and sweet potato casserole, we’re back for more security news! And if you need something to shake you out of that turkey-induced coma, React Server has a single request Remote Code Execution flaw in versions 19.0.1, 19.1.2, and 19.2.1.

The issue is insecure deserialization in the Flight protocol, as implemented right in React Server, and notably also used in Next.js. Those two organizations have both issued Security Advisories for CVSS 10.0 CVEs.

There are reports of a public Proof of Concept (PoC), but the repository that has been linked explicitly calls out that it is not a true PoC, but merely research into how the vulnerability might work. As far as I can tell, there is not yet a public PoC, but reputable researchers have been able to reverse engineer the problem. This implies that mass exploitation attempts are not far off, if they haven’t already started.

Legal AI Breaks Attorney-Client Privilege

We often cover security flaws that are discovered by merely poking around the source of a web interface. [Alex Schapiro] went above and beyond the call of duty, manually looking through minified JS, to discover a major data leak in the Filevine legal AI. And the best part, the problem isn’t even in the AI agent this time.

The story starts with subdomain enumeration — the process of searching DNS records, Google results, and other sources for valid subdomains. That resulted in a valid subdomain and a not-quite-valid web endpoint. This is where [Alex] started digging though Javascript, and found an Amazon AWS endpoint, and a reference to BOX_SERVICE. Making requests against the listed endpoint resulted in both boxFolders and a boxToken in the response. What are those, and what is Box?

Box is a file sharing system, similar to a Google Drive or even Microsoft Sharepoint. And that boxToken was a valid admin-level token for a real law firm, containing plenty of confidential records. It was at this point that [Alex] stopped interacting with the Filevine endpoints, and contacted their security team. There was a reasonably quick turnaround, and when [Alex] re-tested the flaw a month later, it had been fixed.

JSON Formatting As A Service

The web is full of useful tools, and I’m sure we all use them from time to time. Or maybe I’m the only lazy one that types a math problem into Google instead of opening a dedicated calculator program. I’m also guilty of pasting base64 data into a conversion web site instead of just piping it through base64 and xxd in the terminal. Watchtowr researchers are apparently familiar with such laziness efficiency, in the form of JSONformatter and CodeBeautify. Those two tools have an interesting feature: an online save function.

You may see where this is going. Many of us use Github Gists, which supports secret gists protected by long, random URLs. JSONformatter and CodeBeautify don’t. Those URLs are short enough to enumerate — not to mention there is a Recent Links page on both sites. Between the two sites, there are over 80,000 saved JSON snippets. What could possibly go wrong? Not all of that JSON was intended to be public. It’s not hard to predict that JSON containing secrets were leaked through these sites.

And then on to the big question: Is anybody watching? Watchtowr researchers beautified a JSON containing a Canarytoken in the form of AWS credentials. The JSON was saved with the 24 hour timeout, and 48 hours later, the Canarytoken was triggered. That means that someone is watching and collecting those JSON snippets, and looking for secrets. The moral? Don’t upload your passwords to public sites.

Shai Hulud Rises Again

NPM continues to be a bit of a security train wreck, with the Shai Hulud worm making another appearance, with some upgraded smarts. This time around, the automated worm managed to infect 754 packages. It comes with a new trick: pushing the pilfered secrets directly to GitHub repositories, to overcome the rate limiting that effected this worm the first time around. There were over 33,000 unique credentials captured in this wave. When researchers at GitGuardian tested that list a couple days later, about 10% were still valid.

This wave was launched by a PostHog credential that allowed a malicious update to the PostHog NPM package. The nature of Node.js means that this worm was able to very quickly spread through packages where maintainers were using that package. Version 2.0 of Shai Hulud also includes another nasty surprise, in the form of a remote control mechanism stealthily installed on compromised machines. It implies that this is not the last time we’ll see Shai Hulud causing problems.

Bits and Bytes

[Vortex] at ByteRay took a look at an industrial cellular router, and found a couple major issues. This ALLNET router has an RCE, due to CGI handling of unauthenticated HTTP requests. It’s literally just /cgi-bin/popen.cgi?command=whoami to run code as root. That’s not the only issue here, as there’s also a hardcoded username and password. [Vortex] was able to derive that backdoor account information and use hashcat to crack the password. I was unable to confirm whether patched firmware is available.

Google is tired of their users getting scammed by spam phone calls and texts. Their latest salvo in trying to defeat such scams is in-call scam protection. This essentially detects a banking app that is opened as a result of a phone call. When this scenario is detected, a warning dialogue is presented, that suggests the user hangs up the call, and forces a 30 second waiting period. While this may sound terrible for sophisticated users, it is likely to help prevent fraud against our collective parents and grandparents.

What seemed to be just an illegal gambling ring of web sites, now seems to be the front for an Advanced Persistent Threat (APT). That term, btw, usually refers to a government-sponsored hacking effort. In this case, instead of a gambling fraud targeting Indonesians, it appears to be targeting Western infrastructure. One of the strongest arguments for this claim is the fact that this network has been operating for over 14 years, and includes a mind-boggling 328,000 domains. Quite the odd one.

This week Jonathan chats with Konstantinos Margaritis about SIMD programming. Why do these wide data instructions matter? What’s the state of Hyperscan, the project from Intel to power regex with SIMD? And what is Konstantinos’ connection to ARM’s SIMD approach? Watch to find out!

• VectorCamp:https://vectorcamp.gr
• SIMD Info: https://simd.info
• SIMD AI: https://simd.ai
• VSCode plugin: https://code.simd.info

Did you know you can watch the live recording of the show right on our YouTube Channel? Have someone you’d like us to interview? Let us know, or have the guest contact us! Take a look at the schedule here.

Direct Download in DRM-free MP3.

If you’d rather read along, here’s the transcript for this week’s episode.

Theme music: “Newer Wave” Kevin MacLeod (incompetech.com)

Licensed under Creative Commons: By Attribution 4.0 License

This week Jonathan chats with Maurice Kalinowski about QT! That’s the framework that runs just about anywhere, making it easy to write cross-platform applications. What’s the connection with KDE? And how has this turned into a successful company? Watch to find out!

• https://www.qt.io/

Did you know you can watch the live recording of the show right on our YouTube Channel? Have someone you’d like us to interview? Let us know, or have the guest contact us! Take a look at the schedule here.

Direct Download in DRM-free MP3.

If you’d rather read along, here’s the transcript for this week’s episode.

Theme music: “Newer Wave” Kevin MacLeod (incompetech.com)

Licensed under Creative Commons: By Attribution 4.0 License

You may have noticed that large pieces of the Internet were down on Tuesday. It was a problem at Cloudflare, and for once, it wasn’t DNS. This time it was database management, combined with a safety limit that failed unsafe when exceeded.

Cloudflare’s blog post on the matter has the gritty details. It started with an update to how Cloudflare’s ClickHouse distributed database was responding to queries. A query of system columns was previously only returning data from the default database. As a part of related work, that system was changed so that this query now returned all the databases the given user had access to. In retrospect it seems obvious that this could cause problems, but it wasn’t predicted to cause problems. The result was that a database query to look up bot-management features returned the same features multiple times.

That featurelist is used to feed the Cloudflare bot classification system. That system uses some AI smarts, and runs in the core proxy system. There are actually two versions of the core proxy, and they behaved a bit differently when the featurelist exceeded the 200 item limit. When the older version failed, it classified all traffic as a bot. The real trouble was the newer Rust code. That version of the core proxy threw an error in response, leading to 5XX HTTP errors, and the Internet-wide fallout.

Dangling Azure

There’s a weird pitfall with cloud storage when a storage name is used and then abandoned. It’s very much like what happens when a domain name is used and then allowed to expire: Someone else can come along and register it. Microsoft Azure has its own variation on this, in the form of Azure blob storage. And the folks at Eye Security’s research team found one of these floating blobs in an unexpected place: In Microsoft’s own Update Health Service.

The 1.0 version of this tool was indeed exploitable. A simple payload hosted on one of these claimed blob endpoints could trigger an explorer.exe execution with an arbitrary parameter, meaning trivial code execution. The 1.1 version of the Update Health Service isn’t vulnerable by default, requiring a registry change before reaching out to the vulnerable blob locations. That said, there are thousands of machines looking to these endpoints that would be vulnerable to takeover. After the problem was reported, Microsoft took over the blob names to prevent any future misuse.

BADAUDIO

There’s a new malware strain from APT24, going by the name BADAUDIO. Though “new” is a bit of a misnomer here, as the first signs of this particular malware were seen back in 2022. What is new is that Google Threat Intelligence reporting on it. The campaign uses multiple techniques, like compromising existing websites to serve the malware in “watering hole” attacks, to spam and spearphishing.

Notable here is how obfuscated the BADAUDIO malware loader is, using control flow flattening to resist analysis. First consider how good code uses functions to group code into logical blocks. This technique does the opposite, putting code into blocks randomly. The primary mechanism for execution is DLL sideloading, where a legitimate application is run with a malicious DLL in its search path, again primarily to avoid detection. It’s an extraordinarily sneaky bit of malware.

Don’t Leave The Defaults

There’s an RCE (Remote Code Execution) in the W3 Total Cache WordPress plugin. The vulnerability is an eval() that can be reached by putting code in a page to be cached. So if a WordPress site allows untrusted comments, and has caching enabled, there’s just one more hurdle to clear. And that is the W3TC_DYNAMIC_SECURITY value, which seems to be intended to stave off exactly this sort of weakness. So here’s the lesson, don’t leave this sort of security feature default.

Not a Vulnerability

We have a trio of stories that aren’t technically vulnerabilities. The first two are in the mPDF library, that takes HTML code and generates PDFs — great for packaging documentation. The first item of interest in mPDF is the handling of @import css rules. Interestingly, these statements seem to be evaluated even outside of valid CSS, and are handled by passing the URL off to curl to actually fetch the remote content. Those URLs must end in .css, but there’s no checking whether that is in a parameter or not. So evil.org/?.css is totally valid. The use of curl is interesting for another reason, that the Gopher protocol allows for essentially unrestricted TCP connections.

The next quirk in mPDF is in how .svg files are handled. Specifically, how an image xlink inside an svg behaves, when it uses the phar:// or php:// prefixes. These are PHP Archive links, or a raw php link, and the mPDF codebase already guards against such shenanigans, matching links starting with either prefix. The problem here is that there’s path mangling that happens after that guard code. To skip straight to the punchline, :/phar:// and :/php:// will bypass that filter, and potentially run code or leak information.

Now the big question: Why are neither of those vulnerabilities? Even when one is a bypass for a CVE fix from 2019? Because mPDF is only to be used with sanitized input, and does not do that sanitization as part of its processing. And that does check out. It’s probably the majority of tools and libraries that will do something malicious if fed malicious input.

There’s one more “vulnerable” library, esbuild, that has an XSS (Cross Site Scripting) potential. It comes down to the use of escapeForHTML(), and the fact that function doesn’t sanitize quotation marks. Feed that malicious text, and the unescaped quotation mark allows for plenty of havoc. So why isn’t this one a vulnerability? Because the text strings getting parsed are folder names. And if you can upload an arbitrary folder to the server where esbuild runs, you already have plenty of other ways to run code.

Bits and Bytes

There’s another Fortinet bug being exploited in the wild, though this one was patched with FortiWeb 8.0.2. This one gets the WatchTowr treatment. It’s a path traversal that bypasses any real authentication. There are a couple of validation checks that are straightforward to meet, and then the cgi_process() API can be manipulated as any user without authentication. Ouch.

The Lite XL text editor seems pretty nifty, running on Windows, Linux, and macOS, and supporting lua plugins for extensibility. That Lua code support was quite a problem, as opening a project would automatically run the .lua configuration files, allowing direct use of os.execute(). Open a malicious project, run malicious code.

And finally, sometimes it’s the easy approach that works the best. [Eaton] discovered A Cracker Barrel administrative panel built in React JS, and all it took to bypass authentication was to set isAuthenticated = true in the local browser. [Eaton] started a disclosure process, and noticed the bug had already been fixed, apparently discovered independently.

Dogfooding is usually a good thing: That’s when a company uses their own code internally. It’s not so great when it’s a cloud company, and that code has problems. Oracle had this exact problem, running the Oracle Identity Governance Suite. It had a few authentication bypasses, like the presence of ?WSDL or ;.wadl at the end of a URL. Ah, Java is magical.

This week Jonathan chats with Kevin, Colin, and Curtis about Cataclysm: Dark Days Ahead! It’s a rogue-like post-apocalyptic survival game that you can play in the terminal, over SSH if you really want to! Part of the story is a Kickstarter that resulted in a graphics tile-set. And then there’s the mods!

• https://cataclysmdda.org/
• https://github.com/CleverRaven/Cataclysm-DDA

Did you know you can watch the live recording of the show right on our YouTube Channel? Have someone you’d like us to interview? Let us know, or have the guest contact us! Take a look at the schedule here.

Direct Download in DRM-free MP3.

If you’d rather read along, here’s the transcript for this week’s episode.

Theme music: “Newer Wave” Kevin MacLeod (incompetech.com)

Licensed under Creative Commons: By Attribution 4.0 License