#VU29390 Exposed dangerous method or function in Squid - CVE-2020-14058

Vulnerability identifier: #VU29390

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-14058

CWE-ID: CWE-749

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 usage of potentially dangerous function when processing TLS certificates. A remote client can perform a denial of service attack when opening TLS connections.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Squid: 3.1 - 3.5.28, 4.0 - 4.11, 5.0 - 5.0.2

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External links
https://github.com/squid-cache/squid/security/advisories/GHSA-qvf6-485q-vm57

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.