GHSA-47xh-qxqv-mgvg kube-httpcache is vulnerable to Cross-Site Request Forgery (CSRF)

Not scored Published 2 Dec 2022

Exploited in the wild: Not known
Fix: Available

What is GHSA-47xh-qxqv-mgvg?

GHSA-47xh-qxqv-mgvg is a vulnerability in github.com/mittwald/kube-httpcache, published on 2 Dec 2022.

Official description

Impact

> 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. > – https://varnish-cache.org/security/VSV00011.html#vsv00011

Patches

This is fixed in Varnish 6.0.11; Varnish 6.0.11 is available in kube-httpcache versions v0.7.1 and later.

Workarounds

See upstream mitigation hints.

References

https://varnish-cache.org/security/VSV00011.html#vsv00011

Which versions are affected by GHSA-47xh-qxqv-mgvg?

2 open source packages ship an affected version, including github.com/mittwald/kube-httpcache.

Package	Affected	Fixed in
`github.com/mittwald/kube-httpcache` Go	All versions	`0.7.1`
`github.com/mittwald/kube-httpcache` Go	All versions	`0.7.1`

How do I fix GHSA-47xh-qxqv-mgvg?

Upgrade github.com/mittwald/kube-httpcache to 0.7.1 or later.

Is GHSA-47xh-qxqv-mgvg being exploited?

There is no known exploitation of GHSA-47xh-qxqv-mgvg in the wild and no public exploit code.