Netatalk: Insecure tempfile handling in etc2ps.sh
Gentoo Linux Security Advisory
||GLSA 200410-25 / Netatalk
||October 25, 2004
||October 25, 2004: 01
All supported architectures
The etc2ps.sh script, included in the Netatalk package, is vulnerable to
symlink attacks, potentially allowing a local user to overwrite arbitrary
files with the rights of the user running the utility.
Netatalk is a kernel level implementation of the AppleTalk Protocol Suite,
which allows Unix hosts to act as file, print, and time servers for Apple
computers. It includes several script utilities, including etc2ps.sh.
The etc2ps.sh script creates temporary files in world-writeable directories
with predictable names.
A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
etc2ps.sh is executed, this would result in the file being overwritten with
the rights of the user running the utility, which could be the root user.
There is no known workaround at this time.
All Netatalk users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=net-fs/netatalk-1.6.4-r1"
# emerge ">=net-fs/netatalk-1.6.4-r1"