Debian LTS DLA-4161-1 critical: SimpleSAMLphp signature confusion risk
debian lts
May 9, 2025
A vulnerability has been discovered in SimpleSAMLphp, a framework for authentication, primarily via the SAML protocol
Topics Covered
Summary
CVE-2025-27773
The SimpleSAMLphp SAML2 library is a PHP library for SAML2
related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20,
there is a signature confusion attack in the HTTPRedirect binding.
An attacker with any signed SAMLResponse via the HTTP-Redirect
binding can cause the application to accept an unsigned message.
Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.
For Debian 11 bullseye, this problem has been fixed in version
1.19.0-1+deb11u2.
We recommend that you upgrade your simplesamlphp packages.
For the detailed security status of simplesamlphp please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/simplesamlphp
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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Severity
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Critical
Package: simplesamlphp
Version: 1.19.0-1+deb11u2
CVE ID: CVE-2025-27773
Debian Bug: 1100595
Topics Covered
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