Vulnerability identifier: #VU82316

Vulnerability risk: Medium

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-5824

CWE-ID: CWE-237

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 handling of structural elements in HTTP response caching. A remote user can cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Squid: 6.0.1 - 6.3, 5.0 - 5.9, 4.0 - 4.17, 3.0 - 3.5.28, 2.7 - 2.7.STABLE9, 2.6 - 2.6.stable24, 2.5 - 2.5_stable9, 2.4 - 2.4_stable_3, 2.3 - 2.3_stable5, 2.2 - 2.2.stable5, 2.1 - 2.1_patch2, 2.0 - 2.0_patch2

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External links
http://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255

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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.