Vulnerability identifier: #VU32228

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7944

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libxfixes
Other software / Other software solutions

Vendor: xorg.freedesktop.org

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain privileges via a length value of INT_MAX, which triggers the client to stop reading data and get out of sync.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libxfixes: 5.0.1 - 5.0.2

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External links
http://www.openwall.com/lists/oss-security/2016/10/04/2
http://www.openwall.com/lists/oss-security/2016/10/04/4
http://www.securityfocus.com/bid/93361
http://www.securitytracker.com/id/1036945
http://cgit.freedesktop.org/xorg/lib/libXfixes/commit/?id=61c1039ee23a2d1de712843bed3480654d7ef42e
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4CE6VJWBMOWLSCH4OP4TAEPIA7NP53ON/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GE43MDCRGS4R7MRRZNVSLREHRLU5OHCV/
http://lists.x.org/archives/xorg-announce/2016-October/002720.html
http://security.gentoo.org/glsa/201704-03

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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.