GHSA-87m9-rv8p-rgmg go-grpc-compression has a zstd decompression bombing vulnerability
A malicious user can cause denial of service via crafted gRPC requests due to unbounded zstd decompression, requiring library upgrades.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-87m9-rv8p-rgmg?
GHSA-87m9-rv8p-rgmg is a denial of service vulnerability in github.com/mostynb/go-grpc-compression, published on 10 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Impact
A malicious user could cause a denial of service (DoS) when using a specially crafted gRPC request. The decompression mechanism for zstd did not respect the limits imposed by gRPC, allowing rapid memory usage increases.
Versions v1.1.4 through to v1.2.2 made use of the Decoder.DecodeAll function in github.com/klauspost/compress/zstd to decompress data provided by the peer. The vulnerability is exploitable only by attackers who can send gRPC payloads to users of github.com/mostynb/go-grpc-compression/zstd or github.com/mostynb/go-grpc-compression/nonclobbering/zstd.
Patches
Version v1.2.3 of github.com/mostynb/go-grpc-compression avoids the issue by not using the Decoder.DecodeAll function in github.com/klauspost/compress/zstd.
All users of github.com/mostynb/go-grpc-compression/zstd or github.com/mostynb/go-grpc-compression/nonclobbering/zstd in the affected versions should update to v1.2.3.
Workarounds
Other compression formats were not affected, users may consider switching from zstd to another format without upgrading to a newer release.
References
This issue was uncovered during a security audit performed by Miroslav Stampar of 7ASecurity, facilitated by OSTIF, for the OpenTelemetry project.
https://opentelemetry.io/blog/2024/cve-2024-36129 https://github.com/open-telemetry/opentelemetry-collector/security/advisories/GHSA-c74f-6mfw-mm4v
Which versions are affected by GHSA-87m9-rv8p-rgmg?
3 open source packages ship an affected version, including github.com/mostynb/go-grpc-compression.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mostynb/go-grpc-compression Go | From 1.1.4 | 1.2.3 |
github.com/mostynb/go-grpc-compression Go | From 1.1.4 | 1.2.3 |
github.com/mostynb/go-grpc-compression Go | From 1.1.4 | 1.2.3 |
How do I fix GHSA-87m9-rv8p-rgmg?
Upgrade github.com/mostynb/go-grpc-compression to 1.2.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-87m9-rv8p-rgmg being exploited?
There is no known exploitation of GHSA-87m9-rv8p-rgmg in the wild and no public exploit code.
Sources
Also known as GO-2024-2911.