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SANS Stormcast Wednesday, January 7th, 2026: Tailsnitch Review; D-Link DSL EoL Vuln; TOTOLINK Unpatched Vuln

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Tailsnitch Review; D-Link DSL EoL Vuln; TOTOLINK Unpatched Vuln

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Application Security: Securing Web Apps, APIs, and Microservices	Orlando	Mar 29th - Apr 3rd 2026
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Tool Review: Tailsnitch
Tailsnitch is a tool to audit your Tailscale configuration. It does a comprehensive analysis of your configuration and suggests (or even applies) fixes.
https://isc.sans.edu/diary/Tool%20Review%3A%20Tailsnitch/32602

D-Link DSL Command Injection via DNS Configuration Endpoint
A new vulnerability in very old D-Link DSL modems is currently being exploited.
https://www.vulncheck.com/advisories/dlink-dsl-command-injection-via-dns-configuration-endpoint

TOTOLINK EX200 firmware-upload error handling can activate an unauthenticated root telnet service
TOTOLINK extenders may start a telnet server and allow unauthenticated access if a firmware update fails.
https://kb.cert.org/vuls/id/295169

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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

Application Security: Securing Web Apps, APIs, and Microservices	Orlando	Mar 29th - Apr 3rd 2026
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