CVE-2022-2880: 
Grafana vulnerability analysis and mitigation

CVE-2022-2880 is a vulnerability discovered in the Go programming language's ReverseProxy functionality. The issue involves requests forwarded by ReverseProxy including raw query parameters from inbound requests, including unparsable parameters that were rejected by net/http. This vulnerability was disclosed in August 2022 and affects Go versions before 1.18.7 and before 1.19.2 (Go Issue, Go Announce).

The vulnerability exists in the net/http/httputil package, specifically affecting the ReverseProxy.ServeHTTP functionality. When a Go proxy forwards a parameter with an unparsable value, it could permit query parameter smuggling. The issue became particularly relevant after Go 1.17's change in URL parsing to reject keys containing semicolons, which could lead to disagreements between proxy and backend interpretations of request parameters (Go Issue, NVD).

The vulnerability could enable query parameter smuggling attacks when a Go proxy forwards requests containing parameters with unparsable values. This could lead to potential security implications where the proxy and backend systems interpret request parameters differently, potentially allowing attackers to bypass security controls (Go Issue).

The fix was implemented in Go versions 1.18.7 and 1.19.2. After the fix, ReverseProxy sanitizes the query parameters in the forwarded query when the outbound request's Form field is set after the ReverseProxy.Director function returns. Proxies which do not parse query parameters continue to forward the original query parameters unchanged. Users are advised to upgrade to these or later versions (Go Announce).