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securityvulnsSecurityvulnsSECURITYVULNS:DOC:12100
HistoryApr 06, 2006 - 12:00 a.m.

[SA19531] OpenVPN LD_PRELOAD Environment Variable Pushing Vulnerability

2006-04-0600:00:00
vulners.com
15

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.