========================================================================== Ubuntu Security Notice USN-5069-2 September 08, 2021 libapache2-mod-auth-mellon vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 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: USN-5069-1 fixed a vulnerability in mod-auth-mellon. This update provides the corresponding updates for Ubuntu 21.04. Original advisory 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 21.04: libapache2-mod-auth-mellon 0.17.0-1ubuntu0.21.04.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5069-2 https://ubuntu.com/security/notices/USN-5069-1 CVE-2021-3639 Package Information: https://launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.17.0-1ubuntu0.21.04.1