TITLE:
BMC CONTROL-M/Agent Insecure Temporary Directory Usage

SECUNIA ADVISORY ID:
SA17294

VERIFY ADVISORY:
http://secunia.com/advisories/17294/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
BMC CONTROL-M/Agent 6.x for Solaris
http://secunia.com/product/6012/
BMC CONTROL-M/Agent 6.x for Linux
http://secunia.com/product/6013/

DESCRIPTION:
Scott Cromar has reported a vulnerability in BMC Control-M/Agent,
which potentially can be exploited by malicious, local users to
perform certain actions on a vulnerable system with escalated
privileges.

The vulnerability is caused due to the failure to verify that the
"/tmp/ctm" temporary directory is owned by the root user before
writing files into it. If this directory has been deleted by e.g. the
O/S or the root user, then it is possible that a malicious user may
re-create the directory. This can potentially be exploited via
symlink attacks to create or overwrite arbitrary files with the
privileges of the Control-M process.

Successful exploitation requires that e.g. the O/S is configured to
delete the "/tmp/ctm" directory when it restarts or on a regular
basis. 

The vulnerability has been reported in version 6.1.03 on Solaris.
Other versions may also be affected.

SOLUTION:
The vendor recommends that the "/tmp/ctm" directory should not be
deleted. On systems that clears the "/tmp" directory on restart, the
"/tmp/ctm" directory should be re-created immediately on startup with
root user permissions.

A fix reportedly will be implemented in the next major release,
version 6.3.

PROVIDED AND/OR DISCOVERED BY:
Scott Cromar

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