Debian Security Advisory

DLA-3359-1 libapache2-mod-auth-mellon -- LTS security update

Date Reported:
13 Mar 2023
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 931265, Bug 991730.
In Mitre's CVE dictionary: CVE-2019-13038, CVE-2021-3639.
More information:

libapache2-mod-auth-mellon, a SAML 2.0 authentication module for Apache, were reported to have the following vulnerabilities.

  • CVE-2019-13038

    mod_auth_mellon had an Open Redirect via the login?ReturnTo= substring, as demonstrated by omitting the // after http: in the target URL.

  • CVE-2021-3639

    mod_auth_mellon did not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server.

For Debian 10 buster, these problems have been fixed in version 0.14.2-1+deb10u1.

We recommend that you upgrade your libapache2-mod-auth-mellon packages.

For the detailed security status of libapache2-mod-auth-mellon please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: