TITLE:
OpenVPN LD_PRELOAD Environment Variable Pushing Vulnerability

SECUNIA ADVISORY ID:
SA19531

VERIFY ADVISORY:
http://secunia.com/advisories/19531/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
OpenVPN 2.x
http://secunia.com/product/5568/

DESCRIPTION:
Hendrik Weimer has reported a vulnerability in OpenVPN, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to OpenVPN clients allowing the
server to transmit environment variables including LD_PRELOAD to
client-side shell scripts via "setenv" configuration directives. This
can be exploited to execute arbitrary code on a vulnerable client by
placing a malicious file in a known location and load this.

Successful exploitation requires that a user connects to a malicious
server.

The vulnerability has been reported in versions 2.0 through 2.0.5.

SOLUTION:
Update to version 2.0.6.

PROVIDED AND/OR DISCOVERED BY:
Hendrik Weimer

ORIGINAL ADVISORY:
OpenVPN:
http://openvpn.net/changelog.html

Hendrik Weimer:
http://www.osreviews.net/reviews/security/openvpn-print

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