#VU33823 Input validation error in conntrack-tools - CVE-2015-6496

Vulnerability identifier: #VU33823

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-6496

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
conntrack-tools
Other software / Other software solutions

Vendor: conntrack-tools.netfilter.org

Description

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

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Mitigation
Install update from vendor's website.

Vulnerable software versions

conntrack-tools: 1.4.0 - 1.4.6

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External links
https://bugzilla.netfilter.org/show_bug.cgi?id=910
https://lists.fedoraproject.org/pipermail/package-announce/2016-January/174875.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-January/174883.html
https://lists.opensuse.org/opensuse-updates/2015-10/msg00015.html
https://www.debian.org/security/2015/dsa-3341
https://www.openwall.com/lists/oss-security/2015/08/14/4
https://www.openwall.com/lists/oss-security/2015/08/18/1
https://git.netfilter.org/conntrack-tools/commit/?id=c392c159605956c7bd4a264ab4490e2b2704c0cd

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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.