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Ubuntu Security Notice USN-7372-1
March 26, 2025

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Varnish could allow unintended access to network services.

Software Description:
- varnish: state of the art, high-performance web accelerator

Details:

Martin van Kervel Smedshammer discovered that Varnish did not properly
sanitize certain HTTP headers. A remote attacker could possibly use this
issue to perform a cross-site request forgery (CSRF) attack.

Update instructions:

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

Ubuntu 22.04 LTS
  libvarnishapi2                  6.6.1-1ubuntu0.2+esm1
                                  Available with Ubuntu Pro
  varnish                         6.6.1-1ubuntu0.2+esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  libvarnishapi2                  6.2.1-2ubuntu0.2+esm1
                                  Available with Ubuntu Pro
  varnish                         6.2.1-2ubuntu0.2+esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libvarnishapi1                  5.2.1-1ubuntu0.1+esm1
                                  Available with Ubuntu Pro
  varnish                         5.2.1-1ubuntu0.1+esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7372-1
  CVE-2022-45060