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UNIRAS Brief - 109/04 - NGSSoftware Security Bulletin - Buffer Overflow Vulnerabilities in SLWebMail and SLMail Pro Supervisor Report



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 109/04 dated 09.03.04  Time: 11:45  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

NGSSoftware Security Bulletin:

Buffer Overflow Vulnerabilities in SLWebMail and SLMail Pro Supervisor Report 
Center.


Detail
====== 

SLWebMail is installed with SLMail Pro. Implemented as a set of ISAPI applications, 
many suffer from stack based buffer overflow vulnerabilities. Known to be vulnerable 
are user.dll, loadpageadmin.dll and loadpageuser.dll. Even though these ISAPI 
applications are loaded into dllhost, which runs in the security context of the 
IWAM account and not the local system account, the risk should still be considered 
as high and customers should install the patch as soon as is possible.

SLMail. The Supervisor Report Center is a self-contained web server. The image file 
for the web server is webcontainer.exe and the server HTTP response header is returned 
as "OctoWebSvr/COM". The web server listens on TCP port 801 by default. An attacker 
can trigger the overflow by making an HTTP request and providing an overly long HTTP 
sub-version (HTTP/1.x). This sub-version is copied to a stack based buffer and is used 
in the server's response to the client. On overflow the saved return address stored on 
the stack is overwritten allowing the attacker to redirect the process' flow of execution 
and gives the ability to run arbitrary code.



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NGSSoftware Insight Security Research Advisory

Name: SLWebMail Multiple Buffer Overflow Vulnerabilities Systems Affected: 
SLWebMail (Installed with SLMail Pro version 2.0.9 and earlier) on Windows.
Severity: High Risk
Vendor URL: http://www.slmail.com/
Author: David Litchfield [ david@xxxxxxxxxxxxxxx ]
Date Vendor Notified:    13th January 2004
Date of Public Advisory: 5th March 2004
Advisory number: #NISR05022004b
Advisory URL: http://www.ngssoftware.com/advisories/slmailwm.txt

Description
***********
SLWebMail is a web based e-mail solution designed for the small to medium 
enterprise. SLWebMail runs atop Microsoft's Internet Information Server and 
is implemented as a set of ISAPI applications. SLWebMail suffers from 
multiple buffer overflow vulnerabilities.

Details
*******
SLWebMail is installed with SLMail Pro. Implemented as a set of ISAPI 
applications, many suffer from stack based buffer overflow vulnerabilities. 
Known to be vulnerable are user.dll, loadpageadmin.dll and loadpageuser.dll. 
Even though these ISAPI applications are loaded into dllhost, which runs in 
the security context of the IWAM account and not the local system account, 
the risk should still be considered as high and customers should install the 
patch as soon as is possible.

Fix Information
***************
SLMail have made available a patch to resolve these issues: 
http://216.26.170.92/Products/SLMailPro/Utilities.asp . Customers are urged 
to update as soon as is possible.

About NGSSoftware
*****************
NGSSoftware design, research and develop intelligent, advanced application 
security assessment scanners. Based in the United Kingdom, NGSSoftware have 
offices in the South of London and the East Coast of Scotland. NGSSoftware's 
sister company NGSConsulting, offers best of breed security consulting 
services, specialising in application, host and network security 
assessments.

http://www.ngssoftware.com/

Telephone +44 208 401 0070
Fax +44 208 401 0076

enquiries@xxxxxxxxxxxxxxx



NGSSoftware Insight Security Research Advisory

Name: SLMail Pro Supervisor Report Center Buffer Overflow Systems Affected: 
SLMail Pro version 2.0.9 and earlier on Windows.
Severity: High Risk
Vendor URL: http://www.slmail.com/
Author: David Litchfield [ david@xxxxxxxxxxxxxxx ]
Date Vendor Notified:    7th January 2004
Date of Public Advisory: 5th March 2004
Advisory number: #NISR05022004a
Advisory URL: http://www.ngssoftware.com/advisories/slmailsrc.txt

Description
***********
SLMail Pro is a complete e-mail solution designed for the small to medium 
enterprise. A default install of SLMail Pro includes the installation of the 
Supervisor Report Center; this has been found vulnerable to a stack based 
buffer overflow vulnerability.

Details
*******
The Supervisor Report Center is a self-contained web server. The image file 
for the web server is webcontainer.exe and the server HTTP response header 
is returned as "OctoWebSvr/COM". The web server listens on TCP port 801 by 
default. An attacker can trigger the overflow by making an HTTP request and 
providing an overly long HTTP sub-version (HTTP/1.x). This sub-version is 
copied to a stack based buffer and is used in the server's response to the 
client. On overflow the saved return address stored on the stack is 
overwritten allowing the attacker to redirect the process' flow of execution 
and gives the ability to run arbitrary code.

Fix Information
***************
SLMail have made available a patch to resolve this issue: 
http://216.26.170.92/Products/SLMailPro/Utilities.asp . Customers are urged 
to update as soon as is possible.

About NGSSoftware
*****************
NGSSoftware design, research and develop intelligent, advanced application 
security assessment scanners. Based in the United Kingdom, NGSSoftware have 
offices in the South of London and the East Coast of Scotland. NGSSoftware's 
sister company NGSConsulting, offers best of breed security consulting 
services, specialising in application, host and network security 
assessments.

http://www.ngssoftware.com/

Telephone +44 208 401 0070
Fax +44 208 401 0076

enquiries@xxxxxxxxxxxxxxx


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UNIRAS wishes to acknowledge the contributions of NGSSoftware for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
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members and the community at large. 
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<End of UNIRAS Briefing>

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