GMS-2022-7578: kube-httpcache is vulnerable to Cross-Site Request Forgery (CSRF)

December 2, 2022 (updated January 12, 2023)

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.

References

github.com/advisories/GHSA-47xh-qxqv-mgvg
github.com/mittwald/kube-httpcache/security/advisories/GHSA-47xh-qxqv-mgvg
varnish-cache.org/security/VSV00011.html

Code Behaviors & Features

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