CVE-2018-6557

Name	CVE-2018-6557
Description	The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
base-files (PTS)	buster	10.3+deb10u13	fixed
	bullseye	11.1+deb11u9	fixed
	bookworm	12.4+deb12u5	fixed
	trixie	13	fixed
	sid	13.1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
base-files	source	(unstable)	(not affected)

- base-files <not-affected> (Ubuntu specific motd update code; vulnerable code not present)