GO-2022-0236
Panic due to large headers in net/http and golang.org/x/net/http/httpguts
At a glance
- Published
- Updated
- CVE
- CVE-2021-31525
- Aliases
- BIT-golang-2021-31525, GHSA-h86h-8ppg-mxmh
Description
A malicious HTTP server or client can cause the net/http client or server to panic. ReadRequest and ReadResponse can hit an unrecoverable panic when reading a very large header (over 7MB on 64-bit architectures, or over 4MB on 32-bit ones). Transport and Client are vulnerable and the program can be made to crash by a malicious server. Server is not vulnerable by default, but can be if the default max header of 1MB is overridden by setting Server.MaxHeaderBytes to a higher value, in which case the program can be made to crash by a malicious client. This also affects golang.org/x/net/http2/h2c and HeaderValuesContainsToken in golang.org/x/net/http/httpguts.
Affected packages
| Package | Versions |
|---|---|
| Go · stdlib | introduced 0, fixed 1.15.12, introduced 1.16.0-0, fixed 1.16.4 |
| Go · golang.org/x/net | introduced 0, fixed 0.0.0-20210428140749-89ef3d95e781 |
References
- https://go.dev/cl/313069 FIX
- https://go.googlesource.com/net/+/89ef3d95e781148a0951956029c92a211477f7f9 FIX
- https://go.dev/issue/45710 REPORT
- https://groups.google.com/g/golang-announce/c/cu9SP4eSXMc WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — Go Vulnerability Database |