Vulnerability identifier: #VU42563

Vulnerability risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]

CVE-ID: CVE-2013-4123

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Squid
Server applications / IDS/IPS systems, Firewalls and proxy servers
Opensuse
Operating systems & Components / Operating system

Vendor: Squid-cache.org
SUSE

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

client_side_request.cc in Squid 3.2.x before 3.2.13 and 3.3.x before 3.3.8 allows remote attackers to cause a denial of service via a crafted port number in a HTTP Host header.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Squid: 3.2.0.1 - 3.3.7

Opensuse: 3.2.0.1 - 12.3

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External links
http://lists.opensuse.org/opensuse-updates/2013-09/msg00024.html
http://secunia.com/advisories/54142
http://secunia.com/advisories/54834
http://www.squid-cache.org/Advisories/SQUID-2013_3.txt
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11826.patch
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12591.patch

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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. However, proof of concept for this vulnerability is available.