GHSA-j86v-2vjr-fg8f Etcd Gateway TLS endpoint validation only confirms TCP reachability
Etcd gateway fails to validate TLS certificates, allowing connections to non-TLS endpoints when using discovery-srv, bypassing security expectations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-j86v-2vjr-fg8f?
GHSA-j86v-2vjr-fg8f is a vulnerability in go.etcd.io/etcd, published on 3 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Vulnerability type
Cryptography
Workarounds
Refer to the gateway documentation. The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation.
Detail
Secure endpoint validation is performed by the etcd gateway start command when the –discovery-srv flag is enabled. However, as currently implemented, it only validates TCP reachability, effectively allowing connections to an endpoint that doesn't accept TLS connections through the HTTPS URL. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward.
References
Find out more on this vulnerability in the security audit report
For more information
If you have any questions or comments about this advisory:
- Contact the etcd security committee
Which versions are affected by GHSA-j86v-2vjr-fg8f?
6 open source packages ship an affected version, including go.etcd.io/etcd/v3 and go.etcd.io/etcd.
| Package | Affected | Fixed in |
|---|---|---|
go.etcd.io/etcd/v3 Go | All versions | None |
go.etcd.io/etcd/v3 Go | All versions | 3.3.23 |
go.etcd.io/etcd/v3 Go | All versions | 3.3.23 |
go.etcd.io/etcd/v3 Go | From 3.4.0-rc.0 | 3.4.10 |
go.etcd.io/etcd/v3 Go | From 3.4.0-rc.0 | 3.4.10 |
go.etcd.io/etcd Go | All versions | None |
How do I fix GHSA-j86v-2vjr-fg8f?
Upgrade go.etcd.io/etcd/v3 to a fixed version for your release line: 3.3.23 or 3.4.10.
Is GHSA-j86v-2vjr-fg8f being exploited?
There is no known exploitation of GHSA-j86v-2vjr-fg8f in the wild and no public exploit code.
Sources
Also known as GO-2024-2528.