TITLE:
avast! Insecure Temporary File Creation

SECUNIA ADVISORY ID:
SA19683

VERIFY ADVISORY:
http://secunia.com/advisories/19683/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
avast! Linux Home Edition 1.x
http://secunia.com/product/9378/

DESCRIPTION:
Julian L. has reported a vulnerability in avast! Linux Home Edition,
which can be exploited by malicious, local users to perform certain
actions on a vulnerable system with escalated privileges.

When performing a virus scanning, the program checks for the presence
of a specific folder in the "/tmp" directory. If this folder is not
present, it is created with insecure permissions, which can be
exploited via symlink attacks to create, overwrite, or manipulate the
permissions of arbitrary files on the system with the privileges of
the user running the program.

The vulnerability has been reported in version 1.0.5. Other versions
may also be affected.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Julian L.

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