Vulnerability identifier: #VU46117

Vulnerability risk: Medium

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15810

CWE-ID: CWE-444

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 preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote authenticated attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Squid: 2.5.6 - 2.5.stable14, 2.6.stable1 - 2.6.stable24, 2.7 RC2 - 2.7.STABLE9, 3.0 - 3.5.28, 4.0 - 4.12, 5.0.1 - 5.0.3

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External links
http://github.com/squid-cache/squid/security/advisories/GHSA-3365-q9qx-f98m/

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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.