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Novell NetWare Enterprise Web Server /perl/ handler vulnerable to buffer overflow

Vulnerability Note VU#185593

Original Release Date: 2003-07-23 | Last Revised: 2003-08-08


Novell NetWare Enterprise Web Server contains a buffer overflow vulnerability that can be exploited via the /perl/ HTTP request handler. A remote attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the server process.


Novell NetWare 5.1 and 6.0 include a web server called NetWare Enterprise Server. The server contains a buffer overflow vulnerability that can be triggered by a specially crafted HTTP request directed to the /perl/ handler. The vulnerability occurs in the module CGI2PERL.NLM, which is mapped to the /perl/ directory in an HTTP request. Further information is available in Novell Technical Information Document 2966549 and PROTEGO Security Advisory #PSA200301.

NetWare 5.1 with NetWare Enterprise Web Server 3.6 and certain NetWare 6.0 systems (NetWare Enterprise Web Server 6.00d) are affected. In particular, NetWare 6.0 systems that have been upgraded from 5.1 may be affected.


A remote attacker could cause the web server to hang or restart (ABEND), resulting in a denial of service. Since EIP is overwritten, it may be possible for the attacker to execute arbitrary code with the privileges of the server process (Admin).


Apply a patch
Apply the appropriate patch referenced in Novell TID 2966549.

Unmap /perl/ handler

If it is not needed, unmap the /perl/ request handler. Information about how to configure the /perl/ CGI directory can be found in Novell's Perl documentation for Netware Enterprise Web Server.

Vendor Information


Novell Affected

Notified:  May 08, 2003 Updated: July 23, 2003



Vendor Statement


Hash: SHA1

For Immediate Disclosure

============================== Summary ==============================

Security Alert: NOVL-2003-2966549
Title: Enterprise Web Server PERL Handler Buffer Overflow
Date: 23-Jul-2003
Revision: Original
Product Name: Netware Enterprise Web Server
OS/Platform(s): Netware 5.1, 6.0
Reference URL:
Vendor Name: Novell, Inc.
Vendor URL:
Security Alerts:
Affects: cgi2perl.nlm
Identifiers: CERT VU# 185593, CVE: CAN-2003-0562
Credits: Uffe Nielsen

============================ Description ============================

A Buffer Overflow in the PERL handler, (/perl/) may result in a
server ABEND.  The problem is not in the Netscape-based Enterprise
Web Server, but in the Novell-supplied cgi2perl.nlm handler to PERL.

============================== Impact ===============================

One or more server ABENDs may be triggered by buffer overflows,
resulting in degraded performance or crash of the server, in turn
causing in a denial of service to legitimate users of the system.
There is no known ROOT shell exploit from this kind of failure on

======================== Recommended Actions ========================

See detailed instructions in the referenced Technical Information
Document (TID)

============================ DISCLAIMER =============================

The content of this document is believed to be accurate at the time
of publishing based on currently available information. However, the
information is provided "AS IS" without any warranty or
representation. Your use of the document constitutes acceptance of
this disclaimer. Novell disclaims all warranties, express or implied,
regarding this document, including the warranties of merchantability
and fitness for a particular purpose. Novell is not liable for any
direct, indirect, or consequential loss or damage arising from use
of, or reliance on, this document or any security alert, even if
Novell has been advised of the possibility of such damages and even
if such damages are foreseeable.

============================ Appendices =============================


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========================= Revision History ==========================
Original: 23-Jul-2003 - Original Publication

Version: PGP Personal Security 7.0.3


Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


Please see Novell Technical Information Document 2966549.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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This vulnerability was reported by Uffe Nielsen of PROTEGO.

This document was written by Art Manion.

Other Information

CVE IDs: CVE-2003-0562
Severity Metric: 7.22
Date Public: 2003-07-23
Date First Published: 2003-07-23
Date Last Updated: 2003-08-08 21:58 UTC
Document Revision: 37

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