[NEWS] Novell NetMail Multiple Vulnerabilities (Buffer Overflow and XSS)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html 

- - - - - - - - -



  Novell NetMail Multiple Vulnerabilities (Buffer Overflow and XSS)
------------------------------------------------------------------------


SUMMARY

Novell  <http://www.novell.com/products/netmail/> NetMail is an e-mail and 
calendaring system that is based on Internet-standard messaging and 
security protocols.

Remote exploitation of a buffer overflows in Novell's NetMail allows 
unauthenticated attackers to execute arbitrary code with the privileges of 
the underlying user. Lack of proper validation of user input allows 
attackers to perform XSS and steal information from the users.

DETAILS

Vulnerable Systems:
 * Novell NetMail version 3.5.2

IMAPD Command Continuation Request Buffer Overflow:
The problem specifically exists in the handling of command continuation 
requests as the user-specified size value is used directly as the argument 
to a custom memory allocation wrapper (MMalloc()):

00402CA2 lea ecx, [ebx+1] ; ebx is attacker controlled
00402CA5 push ecx
00402CA6 call MMmalloc

The MMalloc() routine performs minimal mathematical operations to the 
supplied value before allocating memory. An attacker can specify a 
malicious number that will result in an integer overflow and cause a small 
memory chunk to be allocated. The original and larger supplied value will 
be later used in an inline memcpy():

00402D6E rep movsd ; destination is attacker allocated
00402D70 mov ecx, edx
00402D72 and ecx, 3
00402D75 rep movsb

This instruction sequence will copy attacker-supplied data beyond the 
brims of the allocated heap chunk and arbitrarily overwrite the heap.
Too large a payload will cause an access violation as it writes off the 
end of the heap. If the supplied data is large enough, it will corrupt the 
heap and eventually result in a classic arbitrary DWORD overwrite in NTDLL 
during subsequent heap manipulation:

77FCC2C0 mov [ecx], eax
77FCC2C2 mov [eax+4], ecx

By overwriting the address of a soon to be called function, the attacker 
can redirect CPU flow and eventually execute arbitrary code.

Successful exploitation of the described vulnerability allows 
unauthenticated remote attackers to execute arbitrary code with the 
privileges of the underlying user, normally NetMailService.

WebAccess Cross-Site Scripting:
When a user opens an appointment containing valid formatted script in the 
body of the message, the browser interprets and executes that script. The 
script could do perform malicious actions on the user's authenticated 
connection. This exploit is available to any client that sends an ical 
object to a NetMail user.

WebAccess Buffer Overflow:
Specifying a very large name on folder rename through the WebAccess or 
WebMail client causes a buffer Overflow that allow attackers to execute 
arbitrary code.

Vendor Status:
The vendor has issued a fix for the vulnerability:  
<http://support.novell.com/filefinder/19357/index.html> 
http://support.novell.com/filefinder/19357/index.html

CVE Information:
 <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1756> 
CAN-2005-1756
 <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1757> 
CAN-2005-1757
 <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1758> 
CAN-2005-1758

Disclosure Timeline:
04/25/2005 - Initial vendor notification
04/25/2005 - Initial vendor response
09/01/2005 - Public disclosure


ADDITIONAL INFORMATION

The information has been provided by  
<mailto:[email protected]> iDEFENSE Labs Security 
Advisories,
Novell.
The original article can be found at:  
<http://www.idefense.com/application/poi/display?id=301&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=301&type=vulnerabilities
The vendor advisory can be found at:  
<http://support.novell.com/cgi-bin/search/searchtid.cgi?/10097957.htm> 
http://support.novell.com/cgi-bin/search/searchtid.cgi?/10097957.htm



======================================== 


This bulletin is sent to members of the SecuriTeam mailing list. 
To unsubscribe from the list, send mail with an empty subject line and body to: [email protected] 
In order to subscribe to the mailing list, simply forward this email to: [email protected] 


==================== 
==================== 

DISCLAIMER: 
The information in this bulletin is provided "AS IS" without warranty of any kind. 
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.