USN-4291-1: mod-auth-mellon vulnerability

libapache2-mod-auth-mellon vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS


libapache2-mod-auth-mellon could be made to redirect users to malicious sites.

Software Description

  • libapache2-mod-auth-mellon - SAML 2.0 authentication module for Apache


It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly use this issue to redirect a user to a malicious URL.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10
libapache2-mod-auth-mellon - 0.14.2-1ubuntu1.19.10.1
Ubuntu 18.04 LTS
libapache2-mod-auth-mellon - 0.13.1-1ubuntu0.2

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.