Input validation error in Squid-cache Squid

1) Input validation error

EUVDB-ID: #VU32717

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 - Improper input validation

Exploit availability: No

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

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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