Debian 9813 Published by

A libapache2-mod-auth-mellon security update has been released for Debian GNU/Linux 10 LTS to address multiple vulnerabilities.

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

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Debian LTS Advisory DLA-3359-1 Utkarsh Gupta
March 13, 2023
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Package : libapache2-mod-auth-mellon
Version : 0.14.2-1+deb10u1
CVE ID : CVE-2019-13038 CVE-2021-3639
Debian Bug : 931265, 991730

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


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


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

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: