#VU82906 Improper Certificate Validation in Squid - CVE-2023-46724
Vulnerability identifier: #VU82906
Vulnerability risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-295
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Squid
Server applications /
IDS/IPS systems, Firewalls and proxy servers
Vendor: Squid-cache.org
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation when processing a specially crafted SSL Certificate in a server certificate chain. A remote attacker can initiate a TLS Handshake with a specially crafted SSL certificate and perform a denial of service (DoS) attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Squid: 3.3 - 3.5.28, 4.0 - 4.17, 5.0 - 5.9, 6.0.1 - 6.3
External links
https://github.com/squid-cache/squid/security/advisories/GHSA-73m6-jm96-c6r3
https://www.squid-cache.org/Versions/v6/SQUID-2023_4.patch
https://www.squid-cache.org/Versions/v5/SQUID-2023_4.patch
https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810
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.
