Debian Security Advisory
DLA-3208-1 varnish -- LTS security update
- Date Reported:
- 27 Nov 2022
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 956307, Bug 1023751.
In Mitre's CVE dictionary: CVE-2020-11653, CVE-2022-45060.
- More information:
Martin van Kervel Smedshammer discovered a request forgery attack can be performed on Varnish Cache servers that have the HTTP/2 protocol turned on. An attacker may introduce characters through the HTTP/2 pseudo-headers that are invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1 requests to the backend. This may in turn be used to successfully exploit vulnerabilities in a server behind the Varnish server.
For Debian 10 buster, these problems have been fixed in version 6.1.1-1+deb10u4.
We recommend that you upgrade your varnish packages.
For the detailed security status of varnish please refer to its security tracker page at: https://security-tracker.debian.org/tracker/varnish
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS