#VU78678 Improper Encoding or Escaping of Output in envoy - CVE-2023-35941

Vulnerability identifier: #VU78678

Vulnerability risk: High

CVSSv4.0: 7.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2023-35941

CWE-ID: CWE-116

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
envoy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cloud Native Computing Foundation

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper encoding or escaping of output. A remote attacker can construct credentials with permanent validity.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

envoy: 1.23.0 - 1.26.3

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.