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Ubuntu Security Notice USN-4597-1
October 22, 2020

libapache2-mod-auth-mellon vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in mod_auth_mellon.

Software Description:
- libapache2-mod-auth-mellon: SAML 2.0 authentication module for Apache

Details:

François Kooman discovered that mod_auth_mellon incorrectly handled
cookies. An attacker could possibly use this issue to cause a Cross-Site
Session Transfer attack. (CVE-2017-6807)

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. (CVE-2019-3877)

It was discovered that mod_auth_mellon incorrectly handled certain requests.
An attacker could possibly use this issue to access sensitive information.
(CVE-2019-3878)

Update instructions:

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

Ubuntu 16.04 LTS:
  libapache2-mod-auth-mellon      0.12.0-2+deb9u1build0.16.04.1

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

References:
  https://usn.ubuntu.com/4597-1
  CVE-2017-6807, CVE-2019-3877, CVE-2019-3878

Package Information:
  https://launchpad.net/ubuntu/+source/libapache2-mod-auth-mellon/0.12.0-2+deb9u1build0.16.04.1