Permissions, Privileges, and Access Controls - CVE-2011-4613
Published: February 5, 2014 / Updated: August 4, 2020
Vulnerability identifier: #VU33697
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-4613
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a local non-authenticated attacker to read and manipulate data.
The X.Org X wrapper (xserver-wrapper.c) in Debian GNU/Linux and Ubuntu Linux does not properly verify the TTY of a user who is starting X, which allows local users to bypass intended access restrictions by associating stdin with a file that is misinterpreted as the console TTY.
Affected software
Ubuntu
xorg-server (Alpine package)
xserver-xorg (Ubuntu package)
xorg-server (Alpine package)
xserver-xorg (Ubuntu package)
How to mitigate CVE-2011-4613
Install update from vendor's website.
xorg-server (Alpine package) - update to 1.11.3-r0
xserver-xorg (Ubuntu package) - addressed in versions 1:7.5+5ubuntu1.1, 1:7.5+6ubuntu3.1, 1:7.6+4ubuntu3.2, 1:7.6+7ubuntu7.1
xserver-xorg (Ubuntu package) - addressed in versions 1:7.5+5ubuntu1.1, 1:7.5+6ubuntu3.1, 1:7.6+4ubuntu3.2, 1:7.6+7ubuntu7.1