CVE-2024-1735: Armeria SAML authentication bypass due to missing validation on unsigned SAML messages
Impact The SAML implementation provided by armeria-saml currently accepts unsigned SAML messages (assertions, logout requests, etc.) as they are, rather than rejecting them by default. As a result, an attacker can forge a SAML message to authenticate themselves, despite the fact that such an unsigned SAML message should be rejected. Patches The vulnerability has been patched in Armeria version 1.27.2.
Published Feb 26, 2024 · Updated Mar 15, 2026
Affected packages
com.linecorp.armeria:armeria-saml
- Ecosystem
- Maven
- Affected
- <= 1.27.1
- Fixed in
- 1.27.2
- Check
mvn dependency:tree -Dincludes=com.linecorp.armeria:armeria-saml
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
Impact
The SAML implementation provided by armeria-saml currently accepts unsigned SAML messages (assertions, logout requests, etc.) as they are, rather than rejecting them by default. As a result, an attacker can forge a SAML message to authenticate themselves, despite the fact that such an unsigned SAML message should be rejected.
Patches
The vulnerability has been patched in Armeria version 1.27.2. All users who rely on armeria-saml older than version 1.27.2 must upgrade to 1.27.2 or later.
Workarounds
There is no known workaround for this vulnerability.
References
Credited to lishiki.
References
- https://github.com/line/armeria/security/advisories/GHSA-4m6j-23p2-8c54
- https://nvd.nist.gov/vuln/detail/CVE-2024-1735
- https://github.com/line/armeria/commit/b2aa9f49b46a7b0e03d8b8d753809cd1e8e2016c
- https://github.com/line/armeria/blob/0efc776988d71be4da6e506ec8a33c2b7b43f567/saml/src/main/java/com/linecorp/armeria/server/saml/SamlMessageUtil.java#L160-L163
- https://github.com/line/armeria/releases/tag/armeria-1.27.2
- https://github.com/advisories/GHSA-4m6j-23p2-8c54
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology