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Vigil@nce - Perl Clipboard: file corruption via clipedit
September 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can create a symbolic link named /tmp/clipedit$$,
in order to alter the pointed file, with privileges of Perl
Clipboard clipedit.
– Impacted products: Unix (platform)
– Severity: 1/4
– Creation date: 01/09/2014
DESCRIPTION OF THE VULNERABILITY
The clipedit script of the Perl Clipboard module uses a temporary
file named /tmp/clipedit$$.
However, when the file is opened, the program does not check if it
is an existing symbolic link. The file pointed by the link is thus
opened with privileges of the program.
Moreover, the file name is predictable, and is located in a
publicly writable directory, so the attacker can create the
symbolic link before its usage.
A local attacker can therefore create a symbolic link named
/tmp/clipedit$$, in order to alter the pointed file, with
privileges of Perl Clipboard clipedit.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Perl-Clipboard-file-corruption-via-clipedit-15247
