Critical severity · published Jul 25, 2023
CVE-2023-35941
Envoy is an open source edge and service proxy designed for cloud-native applications
9.8
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
Envoy · Envoyproxy
1.23.0 before 1.23.12; 1.24.0 before 1.24.10; 1.25.0 before 1.25.9; 1.26.0 before 1.26.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-35941
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-35941
Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-7mhv-gr67-hq55
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