A Shibboleth security update has been released for Ubuntu Linux 20.04 LTS.

USN-4925-1: Shibboleth vulnerability

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Ubuntu Security Notice USN-4925-1
April 22, 2021

shibboleth-sp vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Shibboleth could be made to display malicious content.

Software Description:
- shibboleth-sp: Federated web single sign-on system

Details:

Toni Huttunen and Fraktal Oy discovered that the Shibboleth Service
provider allowed content injection due to allowing attacker-controlled
parameters in error or other status pages. An attacker could use this to
inject malicious content.

Update instructions:

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

Ubuntu 20.04 LTS:
libapache2-mod-shib 3.0.4+dfsg1-1ubuntu0.1
libshibsp-plugins 3.0.4+dfsg1-1ubuntu0.1
libshibsp8 3.0.4+dfsg1-1ubuntu0.1
shibboleth-sp-common 3.0.4+dfsg1-1ubuntu0.1
shibboleth-sp-utils 3.0.4+dfsg1-1ubuntu0.1

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

References:
  https://ubuntu.com/security/notices/USN-4925-1
CVE-2021-28963

Package Information:
  https://launchpad.net/ubuntu/+source/shibboleth-sp/3.0.4+dfsg1-1ubuntu0.1