SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding
Summary
SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-27773 simplesamlphp Fixed in: 1.19.0-1+deb11u2
- Ubuntu UBUNTU-CVE-2025-27773 simplesamlphp
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- web github.com
- web github.com
- web lists.debian.org