SANS Internet Stormcenter Daily Cyber Security Podcast (Stormcast)

• SANS Stormcast Friday, March 27th: Sitecore Exploited; Blasting Past Webp; Splunk and Firefox Vulnerabilities

  Sitecore "thumbnailsaccesstoken" Deserialization Scans (and some new reports) CVE-2025-27218 Our honeypots detected a deserialization attack against the CMS Sitecore using a thumnailaccesstoken header. The underlying vulnerability was patched in January, and security firm Searchlight Cyber revealed details about this vulnerability a couple of weeks ago. https://isc.sans.edu/diary/Sitecore%20%22thumbnailsaccesstoken%22%20Deserialization%20Scans%20%28and%20some%20new%20reports%29%20CVE-2025-27218/31806 Blasting Past Webp Google s Project Zero revealed details how the NSO BLASTPASS exploit took advantage of a Webp image parsing vulnerability in iOS. This zero-click attack was employed in targeted attack back in 2023 and Apple patched the underlying vulnerability in September 2023. But this is the first byte by byte description showing how the attack worked. https://googleprojectzero.blogspot.com/2025/03/blasting-past-webp.html Splunk Vulnerabilities Splunk patched about a dozen of vulnerabilities. None of them are rated critical, but a vulnerability rated High allows authenticated users to execute arbitrary code. https://advisory.splunk.com/ Firefox 0-day Patched Mozilla patched a sandbox escape vulnerability that is already being exploited. https://www.mozilla.org/en-US/security/advisories/mfsa2025-19/

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• SANS Stormcast Thursday Mar 27th: Classifying Malware with ML; Malicious NPM Packages; Google Chrome 0-day

  Leveraging CNNs and Entropy-Based Feature Selection to Identify Potential Malware Artifacts of Interest This diary explores a novel methodology for classifying malware by integrating entropy-driven feature selection with a specialized Convolutional Neural Network (CNN). Motivated by the increasing obfuscation tactics used by modern malware authors, we will focus on capturing high-entropy segments within files, regions most likely to harbor malicious functionality, and feeding these distinct byte patterns into our model. https://isc.sans.edu/diary/%5BGuest%20Diary%5D%20Leveraging%20CNNs%20and%20Entropy-Based%20Feature%20Selection%20to%20Identify%20Potential%20Malware%20Artifacts%20of%20Interest/31790 Malware found on npm infecting local package with reverse shell Researchers at Reversinglabs found two malicious NPM packages, ethers-provider2, and ethers-providerz that patch the well known (and not malicious) ethers package to add a reverse shell and downloader. https://www.reversinglabs.com/blog/malicious-npm-patch-delivers-reverse-shell Google Patched Google Chrome 0-day Google patched a vulnerability in Chrome that was already exploited in attacks against media and educational organizations in Russia https://chromereleases.googleblog.com/2025/03/stable-channel-update-for-desktop_25.html

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• SANS Stormcast Wednesday Mar 26th: XWiki Exploit; File Converter Correction; VMWare Vulnerability; Draytek Router Reboots; MMC Exploit Details;

  XWiki Search Vulnerablity Exploit Attempts (CVE-2024-3721) Our honeypot detected an increase in exploit attempts for an XWiki command injection vulnerablity. The vulnerability was patched last April, but appears to be exploited more these last couple days. The vulnerability affects the search feature and allows the attacker to inject Groovy code templates. https://isc.sans.edu/diary/X-Wiki%20Search%20Vulnerability%20exploit%20attempts%20%28CVE-2024-3721%29/31800 Correction: FBI Image Converter Warning The FBI's Denver office warned of online file converters, not downloadable conversion tools https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam VMWare Vulnerability Broadcom released a fix for a VMWare Tools vulnerability. The vulnerability allows users of a Windows virtual machine to escalate privileges within the machine. https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25518 Draytek Reboots Over the weekend, users started reporting Draytek routers rebooting and getting stuck in a reboot loop. Draytek now published advise as to how to fix the problem. https://faq.draytek.com.au/docs/draytek-routers-rebooting-how-to-solve-this-issue/ Microsoft Managemnt Console Exploit CVE-2025-26633 TrendMicro released details showing how the MMC vulnerability Microsoft patched as part of its patch tuesday this month was exploited. https://www.trendmicro.com/en_us/research/25/c/cve-2025-26633-water-gamayun.html

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• SANS Stormcast Tuesday Mar 25th: Privacy Awware Bots; Ingress Nightmare; Malicious File Converters; VSCode Extension Leads to Ransomware

  Privacy Aware Bots A botnet is using privacy as well as CSRF prevention headers to better blend in with normal browsers. However, in the process they may make it actually easier to spot them. https://isc.sans.edu/diary/Privacy%20Aware%20Bots/31796 Critical Ingress Nightmare Vulnerability ingress-nginx fixed four new vulnerabilities, one of which may lead to a Kubernetes cluster compromise. Note that at the time I am making this live, not all of the URLs below are available yet, but I hope they will be available shortly after publishing this podcast https://www.darkreading.com/application-security/critical-ingressnightmare-vulns-kubernetes-environments https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities https://kubernetes.io/blog/ FBI Warns of File Converter Scams File converters may include malicious ad ons. Be careful where you get your software from. https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam VSCode Extension Includes Ransomware https://x.com/ReversingLabs/status/1902355043065500145

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• SANS Stormcast Monday Mar 24th: Critical Next.js Vulnerability; Microsoft Trust Signing Platform Abuse

  Critical Next.js Vulnerability CVE-2025-29927 A critical vulnerability in how the x-middleware-subrequest header is verified may lead to bypassing authorization in Next.js applications. https://zhero-web-sec.github.io/research-and-things/nextjs-and-the-corrupt-middleware https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw https://www.runzero.com/blog/next-js/ Microsoft Trust Signing Service Abused Attackers abut the Microsoft Trust Signing Service, a service meant to help developers create signed software, to obtain short lived signatures for malware. https://www.bleepingcomputer.com/news/security/microsoft-trust-signing-service-abused-to-code-sign-malware/

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