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kube-httpcache is vulnerable to Cross-Site Request Forgery (CSRF)
GHSA-47xh-qxqv-mgvg
- Affected
- Go github.com/mittwald/kube-httpcache < 0.7.1
- Fixed in
- 0.7.1· Vendor fix available
- Issue
- 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
Recommended action: Upgrade to 0.7.1 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.