CVE-2024-55919: 
Linux Debian vulnerability analysis and mitigation

CVE-2024-55919 is a security vulnerability affecting the generic SSO login functionality in Sympa web interface. The vulnerability was discovered and disclosed on December 16, 2024, affecting all versions of Sympa prior to 6.2.74. This improper input validation vulnerability impacts the authentication mechanism of the Sympa mailing list management software (Sympa Advisory).

The vulnerability stems from improper input validation in the generic SSO functionality of Sympa's web interface when used with specific settings. The issue specifically occurs when the generic SSO is enabled and the force_email_verify parameter is set to 1 in the configuration (Sympa Advisory).

The vulnerability allows an attacker to bypass authentication mechanisms and log in with an arbitrary email address, potentially compromising the security of the mailing list management system (Sympa Advisory).

Several workarounds are available: disabling the web interface entirely, not enabling generic SSO in auth.conf, or not setting force_email_verify to 1. The permanent solution is to upgrade Sympa to version 6.2.74 or later, or apply the security patch sympa-6.2.72-sa-2024-001-r1.patch for versions 6.2 to 6.2.72 (Sympa Advisory).