[NT] Novell eDirectory DOS Device Name DoS

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Novell eDirectory DOS Device Name DoS
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SUMMARY

Novell <http://www.novell.com/products/edirectory/> eDirectory is "a
Lightweight Directory Access Protocol (LDAP)-enabled, directory-based
identity management system".

Novell's eDirectory is vulnerable to denial of service whenever a DOS
device name is requested from server.

DETAILS

Vulnerable Systems:
* Novell eDirectory version 8.7.3 (NT65DE.exe)

Requesting "DOS Device in Path Name" Denial of Service:
The problem exhibits itself when requesting an URL that includes reserved
MS-DOS devices. These represent devices such as the first printer port
(LPT1) and the first serial communication port (COM1).

Reserved MS-DOS device names include (partial list):
AUX, CON ,PRN, COM1 and LPT1.

Proof of concept:
http://target:8008/COM1
http://target:8008/COM2
http://target:8008/AUX

Default open web-ports:
8008 HTTP
8010 HTTPS

When the attack is preformed the service will stop, until manually
restarted

Patch Availability:
Apply the current interim release for eDirectory 8.7.3 available on the
<http://support.novell.com/novell> http://support.novell.com/novell

Disclosure Timeline:
* 08.01.05 - Vulnerability discovered
* 17.04.05 - Research ended
* 18.04.05 - Novell Notified (secure@novell.com)
* 18.04.05 - Received response from Ed Reed, Security Tzar, Novell, Inc.
* 03.06.05 - Novell Fixes issue
* 13.06.05 - Public Release

ADDITIONAL INFORMATION

The information has been provided by <mailto:advisory@cirt.dk> Dennis
Rand.
The original article can be found at:
<http://www.cirt.dk/advisories/cirt-33-advisory.pdf>
http://www.cirt.dk/advisories/cirt-33-advisory.pdf

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