[UNIX] klprfax_filter Symlink Vulnerability

From: support@securiteam.com
Date: 12/28/01 

From: support@securiteam.com
To: list@securiteam.com
Date: Fri, 28 Dec 2001 11:17:30 +0100 (CET)

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  klprfax_filter Symlink Vulnerability
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SUMMARY

KLPRFax is an LPD fax front-end using efax. A utility called
`klprfax_filter`, which is a part of the KLPRFax package suffers from a
symlink vulnerability that would allow a local user to overwrite and
create files with root privileges.

DETAILS

Vulnerable systems:
kdeutils version 2.2-2

When using klprfax_filter, the product would create a temporary file
inside the /tmp directory called klprfax.filter however this temporary
file is not created safely, allowing attackers to overwrite system
sensitive files.

Workaround:
Remove the suid bit from efax.

ADDITIONAL INFORMATION

The information has been provided by <mailto:r0gue@21cn.com> wang yuan
and <mailto:staikos@0wned.org> George Staikos.

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