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
About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.
Subscribe:
http://secunia.com/secunia_security_advisories/
Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/
Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.