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TITLE:
ActivePerl sitecustomize.pl Privilege Escalation

SECUNIA ADVISORY ID:
SA20328

VERIFY ADVISORY:
http://secunia.com/advisories/20328/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
ActivePerl 5.x
http://secunia.com/product/3328/

DESCRIPTION:
Kreej has discovered a security issue in ActivePerl, which can be
exploited by malicious, local users to gain escalated privileges.

The problem is caused due to a combination of insecure use of the
"sitecustomize.pl" file and insecure default directory permissions
(grants "Users" group permissions to create files). This can be
exploited to execute arbitrary code with the privileges of another
user running ActivePerl by creating a malicious "sitecustomize.pl"
file in the "site/lib" directory.

The security issue has been confirmed in version 5.8.8.817 for
Windows. Other versions may also be affected.

SOLUTION:
Create an empty sitecustomize.pl in the "site/lib" directory.

Always run ActivePerl with the "-f" command line option.

The vendor is planning on including an empty sitecustomize.pl in the
818 release build.

PROVIDED AND/OR DISCOVERED BY:
Kreej

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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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.
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use those supplied by the vendor.

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