bugtraq - RE: EEYE: Microsoft ASN.1 Library Length Overflow Heap Corruption

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Date: Tue, 10 Feb 2004 11:44:43 -0800
From: "Marc Maiffret" <mmaiffret@...e.com>
To: "Joe Blatz" <sd_wireless@...oo.com>, <BUGTRAQ@...urityfocus.com>
Subject: RE: EEYE: Microsoft ASN.1 Library Length Overflow Heap Corruption


This attack can be performed through various encryption systems such as
Kerberos and almost anything using CERTs... I am not sure about
Microsofts wording in their advisory.

Signed,
Marc Maiffret
Chief Hacking Officer
eEye Digital Security
T.949.349.9062
F.949.349.9538
http://eEye.com/Retina - Network Security Scanner
http://eEye.com/Iris - Network Traffic Analyzer
http://eEye.com/SecureIIS - Stop known and unknown IIS vulnerabilities 

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| -----Original Message-----
| From: Joe Blatz [mailto:sd_wireless@...oo.com] 
| Sent: Tuesday, February 10, 2004 11:36 AM
| To: Marc Maiffret; BUGTRAQ@...urityfocus.com
| Subject: RE: EEYE: Microsoft ASN.1 Library Length Overflow 
| Heap Corruption
| 
| In the security bulletin published by MS it states, "In the 
| most likely exploitable scenario, an attacker would have to 
| have direct access to the user's network."
| 
| The bulletin published by eEye states "...applications that 
| make use of certificates (SSL, digitally-signed e-mail, 
| signed ActiveX controls, etc.) [are affected]".
| 
| I see a big disconnect there. Can you address this?
| Also, how would this potentially affect sites that are using 
| an MS VPN solution?
| 
| 
| > -----Original Message-----
| > From: Marc Maiffret [mailto:mmaiffret@...e.com]
| > Sent: Tuesday, February 10, 2004 10:20 AM
| > To: BUGTRAQ@...urityfocus.com
| > Subject: EEYE: Microsoft ASN.1 Library Length Overflow Heap 
| Corruption
| > 
| > Microsoft ASN.1 Library Length Overflow Heap Corruption
| > 
| > Release Date:
| > February 10, 2004
| > 
| > Date Reported:
| > July 25, 2003
| > 
| > Severity:
| > High (Remote Code Execution)
| > 
| > Systems Affected:
| > Microsoft Windows NT 4.0 (all versions) Microsoft Windows 2000 (SP3 
| > and earlier) Microsoft Windows XP (all versions)
| > 
| > Software Affected:
| > Microsoft Internet Explorer
| > Microsoft Outlook
| > Microsoft Outlook Express
| > Third-party applications that use certificates
| > 
| > Services Affected:
| > Kerberos (UDP/88)
| > Microsoft IIS using SSL
| > NTLMv2 authentication (TCP/135, 139, 445)
| 
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