Handler on Duty: Didier Stevens
Threat Level: green
Podcast Detail
SANS Stormcast Monday, December 22nd, 2025: TLS Callbacks; FreeBSD RCE; NIST Time Server Issues
If you are not able to play the podcast using the player below: Use this direct link to the audio file: https://traffic.libsyn.com/securitypodcast/9748.mp3
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DLLs & TLS Callbacks
As a follow-up to last week's diary about DLL Entrypoints, Didier is looking at TLS (“Thread Local Storage”) and how it can be abused.
https://isc.sans.edu/diary/DLLs%20%26%20TLS%20Callbacks/32580
FreeBSD Remote code execution via ND6 Router Advertisements
A critical vulnerability in FreeBSD allows for remote code execution. But an attacker must be on the same network.
https://www.freebsd.org/security/advisories/FreeBSD-SA-25:12.rtsold.asc
NIST Time Server Problems
The atomic ensemble time scale at the NIST Boulder campus has failed due to a prolonged utility power outage. One impact is that the Boulder Internet Time Services no longer have an accurate time reference.
https://tf.nist.gov/tf-cgi/servers.cgi https://groups.google.com/a/list.nist.gov/g/internet-time-service/c/o0dDDcr1a8I
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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