Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks
Description
Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. The HTTP Gateway processes headers, but with no timeout set. With a slow loris attack, an attacker could cause Denial of Service (DoS). Exploitation does not require authentication nor authorization, so anyone can exploit it. It should nonetheless not be exploitable as it is highly recommended to bury Chall-Manager deep within the infrastructure due to its large capabilities, so no users could reach the system. Patch has been implemented by commit 1385bd8 and shipped in v0.1.4.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/ctfer-io/chall-managerGo | < 0.1.4 | 0.1.4 |
Affected products
1- Range: < 0.1.4
Patches
11385bd869142fix: potential slowloris attack on http server header reading
1 file changed · +2 −0
server/server.go+2 −0 modified@@ -6,6 +6,7 @@ import ( "math" "net" "net/http" + "time" grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware" "github.com/grpc-ecosystem/grpc-gateway/v2/runtime" @@ -151,6 +152,7 @@ func (s *Server) newHTTPServer(ctx context.Context, grpcWebHandler http.Handler) "application/grpc-web+proto": grpcWebHandler, }, }, + ReadHeaderTimeout: time.Second, } // Build gateway to the HTTP 1.1+JSON server
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-ggmv-j932-q89qghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-53634ghsaADVISORY
- github.com/ctfer-io/chall-manager/commit/1385bd869142651146cd0b123085f91cec698636ghsax_refsource_MISCWEB
- github.com/ctfer-io/chall-manager/releases/tag/v0.1.4ghsax_refsource_MISCWEB
- github.com/ctfer-io/chall-manager/security/advisories/GHSA-ggmv-j932-q89qghsax_refsource_CONFIRMWEB
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