[USN-5069-1] mod-auth-mellon vulnerability

========================================================================== 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: ubuntu.com/security/notices/USN-5069-1 CVE-2021-3639
Package Information: launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.16.0-1ubuntu0.1 launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.13.1-1ubuntu0.3