========================================================================== Ubuntu Security Notice USN-5069-1 September 08, 2021 libapache2-mod-auth-mellon vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: mod-auth-mellon could be made to redirect to arbitrary sites. Software Description: - libapache2-mod-auth-mellon: SAML 2.0 authentication module for Apache Details: It was discovered that mod-auth-mellon incorrectly filtered certain URLs. A remote attacker could possibly use this issue to perform an open redirect attack. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: libapache2-mod-auth-mellon 0.16.0-1ubuntu0.1 Ubuntu 18.04 LTS: libapache2-mod-auth-mellon 0.13.1-1ubuntu0.3 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5069-1 CVE-2021-3639 Package Information: https://launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.16.0-1ubuntu0.1 https://launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.13.1-1ubuntu0.3