Vulnerability identifier: #VU32717

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-1839

CWE-ID: CWE-20

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 non-authenticated attacker to perform a denial of service (DoS) attack.

The strHdrAcptLangGetItem function in errorpage.cc in Squid 3.2.x before 3.2.9 and 3.3.x before 3.3.3 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a "," character in an Accept-Language header.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Squid: 3.2.0.1 - 3.2.8

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External links
http://archives.neohapsis.com/archives/bugtraq/2013-03/0025.html
http://archives.neohapsis.com/archives/bugtraq/2013-03/0069.html
http://secunia.com/advisories/52588
http://www.openwall.com/lists/oss-security/2013/03/11/7
http://www.securityfocus.com/bid/58316
http://www.squid-cache.org/Advisories/SQUID-2013_1.txt

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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.