Vulnerability · Published Jul 25, 2023 · Assigned by GitHub_M

CVE-2023-35941Envoy vulnerable to OAuth2 credentials exploit with permanent validity

High 8.6

In plain English

A high-severity security flaw in envoy from envoyproxy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.8%top 42.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, a malicious client is able to construct credentials with permanent validity in some specific scenarios. This is caused by the some rare scenarios in which HMAC payload can be always valid in OAuth2 filter's check. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, avoid wildcards/prefix domain wildcards in the host's domain configuration.

Affected products (as reported)

Vendor	Product	Versions
envoyproxy	envoy	>= 1.26.0, < 1.26.4>= 1.25.0, < 1.25.9>= 1.24.0, < 1.24.10< 1.23.12

Weakness: CWE-116 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-7mhv-gr67-hq55 x_refsource_CONFIRM