Vulnerability identifier: #VU74473

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-27496

CWE-ID: CWE-20

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 perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when a redirect url without a state param is received in the oauth filter. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

envoy: 1.0.0 - 1.25.3

---

External links
http://github.com/envoyproxy/envoy/security/advisories/GHSA-j79q-2g66-2xv5
http://github.com/envoyproxy/envoy/releases/tag/v1.25.4
http://github.com/envoyproxy/envoy/releases/tag/v1.24.5
http://github.com/envoyproxy/envoy/releases/tag/v1.23.7
http://github.com/envoyproxy/envoy/releases/tag/v1.22.10

---

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.