Vulnerability Note VU#185593

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

Overview

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.

I. Description

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.

II. Impact

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).

III. Solution

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.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Novell	Vulnerable	23-Jul-2003

References

http://www.protego.dk/advisories/200301.html
http://support.novell.com/cgi-bin/search/searchtid.cgi?/2966549.htm
http://developer.novell.com/ndk/doc/perl5/prl57enu/data/hyyq6w6r.html
http://developer.novell.com/ndk/doc/general/glossenu/data/alffzwf.html
http://www.secunia.com/advisories/9345/

Credit

This vulnerability was reported by Uffe Nielsen of PROTEGO.

This document was written by Art Manion.

Other Information

Date Public:	2003-07-23
Date First Published:	2003-07-23
Date Last Updated:	2003-08-08
CERT Advisory:
CVE-ID(s):	CAN-2003-0562
NVD-ID(s):	CAN-2003-0562
US-CERT Technical Alerts:
Metric:	7.22
Document Revision:	35

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

Get Adobe Reader