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TITLE:
GNU Sharutils unshar Insecure Temporary File Creation

SECUNIA ADVISORY ID:
SA14551

VERIFY ADVISORY:
http://secunia.com/advisories/14551/

CRITICAL:
Not critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
GNU Sharutils 4.x
http://secunia.com/product/4880/

DESCRIPTION:
Joey Hess has reported a vulnerability in GNU Sharutils, which
potentially can be exploited by malicious, local users to conduct
certain actions on a vulnerable system with escalated privileges.

The vulnerability is caused due to the unshar utility creating
temporary files insecurely with predictable filenames. This can
potentially be exploited via symlink attacks to create or overwrite
arbitrary files on the system with the privileges of the user running
unshar.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Joey Hess

ORIGINAL ADVISORY:
http://www.ubuntulinux.org/support/documentation/usn/usn-104-1

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