Out-of-bounds write in libx11 - CVE-2016-7943
Published: December 13, 2016 / Updated: July 28, 2020
Vulnerability identifier: #VU32227
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2016-7943
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The XListFonts function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving length fields, which trigger out-of-bounds write operations.
Affected software
libx11
Gentoo Linux
Slackware Linux
Fedora
libx11 (Alpine package)
libX11
Gentoo Linux
Slackware Linux
Fedora
libx11 (Alpine package)
libX11
How to mitigate CVE-2016-7943
Install update from vendor's website.
libx11 - update to 1.6.4
libx11 (Alpine package) - update to 1.6.2-r2
libX11 - update to 1.6.4-1.fc25
libx11 (Alpine package) - update to 1.6.2-r2
libX11 - update to 1.6.4-1.fc25
External References
- 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/93362
- http://www.securitytracker.com/id/1036945
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9
- 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/