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NSFOCUS SA2001-07 : ActivePerl PerlIS.dll Remote Buffer Overflow Vulnerability
From: Nsfocus Security Team <security () nsfocus com>
Date: Thu, 15 Nov 2001 11:39:43 +0800

NSFOCUS Security Advisory(SA2001-07)

Topic:  ActivePerl PerlIS.dll Remote Buffer Overflow Vulnerability

Release Date: 2001-11-15

CVE CAN ID : CAN-2001-0815
BUGTRAQ ID : 3526

Affected system:
================

Activestate ActivePerl 5.6.1.629 and earlier versions
 - Microsoft IIS 4.0
 - Microsoft IIS 5.0

Not affected system:
====================

Activestate ActivePerl 5.6.1.630
 - Microsoft IIS 4.0
 - Microsoft IIS 5.0

Impact: 
=========

NSFOCUS Security Team has found a exploited buffer overflow vulnerability in 
a dynamic link library (perlIS.dll) of ActivePerl when handling overlong 
filename. Exploit of it, an attacker could remotely execute arbitrary code.

Description:
============

ActivePerl is a binary package of perl for Linux, Solaris or Windows system 
developed by ActiveState. ActivePerl for windows has a dynamic link library, 
perlIS.dll, which is a ISAPI extension to provide high-performance perl 
interface for Microsoft IIS server. 

PerlIS.dl was discovered to handle perl script request sent by user without 
correct length check of the URL. In case that an attacker send an overlong URL 
request, PerlIS would call strcpy() and copy it to a stack buffer, which would 
trigger a buffer overflow. Attacker could overwrite some sensitive data in the
stack like returned address. With well-crafted URL request, the attacker might 
be able to execute arbitrary code remotely.

Exploiting this vulnerability successfully, an attack might access 
IWAM_machinename account in IIS 5.0 and Local SYSTEM privilege in IIS 4.0.


Exploit:
==========

$ lynx http://host/cgi-bin/`perl -e 'print "A" x 360'`.pl

The remote procedure call failed.

Workaround:
===================

Edit "perlIS.dll" ISAPI extension in Internet Service Manager and check "Check 
that file exists" option.


Vendor Status:
==============

2001.10.15  We reported this vulnerability to ActiveState.
2001.10.23  ActiveState informed that the vulnerability has been eliminated in
            build 630.

Latest version of ActivePerl is available at

http://www.activestate.com/Products/ActivePerl/download.plex


Additional Information:
========================

The Common Vulnerabilities and Exposures (CVE) project has 
assigned the name CAN-2001-0815 to this issue. This is a 
candidate for inclusion in the CVE list (http://cve.mitre.org),
which standardizes names for security problems.  Candidates 
may change significantly before they become official CVE entries.

DISCLAIMS:
==========
THE INFORMATION PROVIDED IS RELEASED BY NSFOCUS "AS IS" WITHOUT WARRANTY
OF ANY KIND. NSFOCUS DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, 
EXCEPT FOR THE WARRANTIES OF MERCHANTABILITY. IN NO EVENTSHALL NSFOCUS 
BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, 
INCIDENTAL,CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, 
EVEN IF NSFOCUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 
DISTRIBUTION OR REPRODUTION OF THE INFORMATION IS PROVIDED THAT THE 
ADVISORY IS NOT MODIFIED IN ANY WAY.

Copyright 1999-2001 NSFOCUS. All Rights Reserved. Terms of use.


NSFOCUS Security Team <security () nsfocus com>
NSFOCUS INFORMATION TECHNOLOGY CO.,LTD
(http://www.nsfocus.com)
 


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