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Category:   Application (Security)  >   Sudo Vendors:   sudo.ws
Sudo Input Validation Flaw in Perl-related Environment Variables Lets Certain Local Users Execute Arbitrary Perl Code
SecurityTracker Alert ID:  1015192
SecurityTracker URL:  http://securitytracker.com/id/1015192
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 11 2005
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 1.6.8p12
Description:   A vulnerability was reported in Sudo. A local user with permission to run a perl script can execute arbitrary perl code.

Sudo does not properly validate the PERL5LIB, PERLLIB, and PERL5OPT environment variables. A local user with sudo permissions to run a perl script (without the tainting option) can set these variables to execute an arbitrary file with a name that is identical to the name of a system library included by the perl script.

Charles Morris discovered this vulnerability.

Impact:   A local user with permissions to run a perl script can execute arbitrary perl code on the target system.
Solution:   The vendor has issued a fixed version (1.6.8p12), available at:

http://www.sudo.ws/sudo/download.html

Vendor URL:  www.sudo.ws/sudo/alerts/perl_env.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


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