Title: KDE2 KDEUtils KLPRFax_Filter Insecure Temporary File Creation Vulnerability
Severity: MODERATE
Description:
KDE2 is a freely available, open source X Window System manager. It is maintained by the KDE Project.
A problem with a program included with the KDE Utils package could make it possible for a local user to launch a symbolic link attack. The problem is in the klprfax_filter program.
klprfax_filter is a program included with KDE2 for fax functionality. klprfax_filter works by adding a printer as a fax system, then putting the output of a print job through a filter to fax.
The problem is in the creation of files in the temporary directory. The program uses the following code:
cat >/tmp/klprfax.$$
/opt/kde/bin/klprfax --fax /tmp/klprfax.$$ >/tmp/klprfax.filter 2>&1
rm -f /tmp/klprfax.$$
The program does not check for the existance of the klprfax.filter file prior to attempting to send input to it. This makes it possible for a local user to create a symbolic link to any file that is write-accessible by the user executing klprfax_filter, and overwrite the contents of the file.
This could result in a local user overwriting files owned by other users, and potentially elevated privileges.
Affected Products:
- KDE KDEUtils 2.2.0
- KDE KDEUtils 2.2.0 -2
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