Permissions, Privileges, and Access Controls in xorg.freedesktop libx11

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32226

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-7942

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving image type and geometry, which triggers out-of-bounds read operations.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libx11: 1.6.0 - 1.6.3

CPE2.3

• cpe:2.3:a:xorg.freedesktop.org:libx11:1.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:xorg.freedesktop.org:libx11:1.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:xorg.freedesktop.org:libx11:1.6.2:*:*:*:*:*:*:*

External links

https://www.openwall.com/lists/oss-security/2016/10/04/2
https://www.openwall.com/lists/oss-security/2016/10/04/4
https://www.securityfocus.com/bid/93363
https://www.securitytracker.com/id/1036945
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8ea762f94f4c942d898fdeb590a1630c83235c17
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GMCVDXMFPXR7QGMKDG22WPPJCXH2X3L7/
https://lists.x.org/archives/xorg-announce/2016-October/002720.html
https://security.gentoo.org/glsa/201704-03
https://usn.ubuntu.com/3758-1/
https://usn.ubuntu.com/3758-2/

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.