#VU74474 Input validation error in envoy - CVE-2023-27488
Vulnerability identifier: #VU74474
Vulnerability risk: Medium
CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2023-27488
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 escalate privileges on the system.
The vulnerability exists due to insufficient validation of user-supplied input when "failure_mode_allow: true" is configured for ext_authz filter. A remote attacker can pass specially crafted input to the application and gain elevated privileges on the target system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
envoy: 1.0.0, 1.1.0 - 1.19.5, 1.2.0 - 1.25.3, 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0 - 1.7.1, 1.8.0, 1.9.0 - 1.9.1
External links
https://github.com/envoyproxy/envoy/security/advisories/GHSA-9g5w-hqr3-w2ph
https://github.com/envoyproxy/envoy/releases/tag/v1.25.4
https://github.com/envoyproxy/envoy/releases/tag/v1.24.5
https://github.com/envoyproxy/envoy/releases/tag/v1.23.7
https://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.
