Vulnerability identifier: #VU32297

Vulnerability risk: High

CVSSv3.1: 7.1 [AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-3947

CWE-ID: CWE-122

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 execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Heap-based buffer overflow in the Icmp6::Recv function in icmp/Icmp6.cc in the pinger utility in Squid before 3.5.16 and 4.x before 4.0.8. A remote attacker can use an ICMPv6 packet. to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
The vendor has issued the following versions to address this vulnerability: 3.5.16, 4.0.8.

Vulnerable software versions

Squid: 3.5.0.1 - 3.5.15, 4.0.1 - 4.0.7

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External links
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html
http://www.securitytracker.com/id/1035457
http://www.squid-cache.org/Advisories/SQUID-2016_3.txt
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10495.patch
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11839.patch
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12694.patch
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13232.patch
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-14015.patch
http://www.ubuntu.com/usn/USN-2995-1
http://security.gentoo.org/glsa/201607-01

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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.