[arch-security] [ASA-201710-10] xorg-server: multiple issues
anthraxx at archlinux.org
Tue Oct 10 16:10:39 UTC 2017
Arch Linux Security Advisory ASA-201710-10
Date : 2017-10-08
CVE-ID : CVE-2017-13721 CVE-2017-13723
Package : xorg-server
Type : multiple issues
Remote : No
Link : https://security.archlinux.org/AVG-432
The package xorg-server before version 1.19.4-1 is vulnerable to
multiple issues including arbitrary code execution and denial of
Upgrade to 1.19.4-1.
# pacman -Syu "xorg-server>=1.19.4-1"
The problems have been fixed upstream in version 1.19.4.
- CVE-2017-13721 (denial of service)
A denial of service vulnerability was found in xorg-server in the
ProcShmCreateSegment function due to a missing shmseg resource ids
validation. A passed shmseg resource id may belong to a non-existing
client and abort X server with FatalError "client not in use", or
overwrite existing segment of another existing client.
- CVE-2017-13723 (arbitrary code execution)
A stack buffer overflow was found in xkbtext.c, which didn't handle xkb
formatted string output safely due to a single shared static buffer.
The fix introduces a ring of resizable buffers to avoid problems when
strings end up longer than anticipated.
This vulnerability may potentially lead to privilege escalation when
the xorg-server is running with root privileges.
A local attacker is able to crash the xorg-server process leading to
denial of service or possibly elevate privileges when the xorg-server
is running with root privileges.
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