Vulnerability identifier: #VU18950

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-8160

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to net/netfilter/nf_conntrack_proto_generic.c in the Linux kernel generates incorrect conntrack entries when handling certain iptables rule sets for the SCTP, DCCP, GRE, and UDP-Lite protocols. A remote attacker can send packets with disallowed port numbers to the affected system and bypass iptables filtering rules. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.101, 3.1 - 3.17.8, 3.2 - 3.2.93, 3.3 rc1 - 3.3.8, 3.4 - 3.4.113, 3.5 - 3.5.7, 3.6 - 3.6.11, 3.7 - 3.7.10, 3.8 - 3.8.13, 3.9 - 3.9.11

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External links
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=db29a9508a9246e77087c5531e45b2c88ec6988b
http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html
http://rhn.redhat.com/errata/RHSA-2015-0284.html
http://rhn.redhat.com/errata/RHSA-2015-0290.html
http://rhn.redhat.com/errata/RHSA-2015-0674.html
http://www.debian.org/security/2015/dsa-3170
http://www.mandriva.com/security/advisories?name=MDVSA-2015:057
http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
http://www.openwall.com/lists/oss-security/2015/01/14/3
http://www.securityfocus.com/bid/72061
http://www.spinics.net/lists/netfilter-devel/msg33430.html
http://www.ubuntu.com/usn/USN-2513-1
http://www.ubuntu.com/usn/USN-2514-1
http://www.ubuntu.com/usn/USN-2515-1
http://www.ubuntu.com/usn/USN-2516-1
http://www.ubuntu.com/usn/USN-2517-1
http://www.ubuntu.com/usn/USN-2518-1
http://bugzilla.redhat.com/show_bug.cgi?id=1182059
http://github.com/torvalds/linux/commit/db29a9508a9246e77087c5531e45b2c88ec6988b

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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.