Podcast Detail

SANS Stormcast Monday, December 1st, 2025: More ClickFix; Teams Guest Access; Geoserver XXE Vulnerablity

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More ClickFix; Teams Guest Access; Geoserver XXE Vulnerablity

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Network Monitoring and Threat Detection In-Depth	Online \| Central European Time	Dec 15th - Dec 20th 2025
Application Security: Securing Web Apps, APIs, and Microservices	Orlando	Mar 29th - Apr 3rd 2026

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Fake adult websites pop realistic Windows Update screen to deliver stealers via ClickFix
The latest variant of ClickFix tricks users into copy/pasting commands by displaying a fake blue screen of death.
https://www.acronis.com/en/tru/posts/fake-adult-websites-pop-realistic-windows-update-screen-to-deliver-stealers-via-clickfix/

B2B Guest Access Creates an Unprotected Attack Vector
Users may be tricked into joining an external Teams workspace as a guest, bypassing protections typically enabled for Teams workspaces.
https://www.ontinue.com/resource/blog-microsoft-chat-with-anyone-understanding-phishing-risk/

Geoserver XXE Vulnerability CVE-2025-58360
Geoserver patched an external XML entity (XXE) vulnerability.
https://helixguard.ai/blog/CVE-2025-58360

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Discussion

The Shibboleth vulnerability is quite interesting. In their example, the SAML signature covers the entire and they've made modifications to it (the changes to the uid) that should cause the signature to fail validation. This vulnerability speaks to larger architectural issues with Shibboleth. Obviously the signature validation is happening on a DIFFERENT document (the inline DTD defs are resolved and replaced) than the attribute extraction code works on (the inline DTD variables are not replaced). This is a HUGE no no and leads to the confused deputy issues that caused the vulnerability. I would bet other SP SAML parsing code is making similar mistakes.

Posted by Anonymous on Tue Jan 16 2018, 16:54

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