Multiple Vulnerabilities in SLWebMail

NGSSoftware Insight Security Research Advisory

Name: Multiple Vulnerabilities in SLWebMail

Systems Affected: SLWebMail 3 on Windows

Severity: High Risk

Vendor URL: http://www.slmail.com

Authors: David Litchfield (david@ngssoftware.com)

Mark Litchfield (mark@ngssoftware.com)

Date: 7th May 2003

Advisory URL: http://www.nextgenss.com/advisories/slwebmail-vulns.txt

Advisory number: #NISR07052003B

Description

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SLWebMail is a web based e-mail system that runs on top of Microsoft’s Internet Information Server. It is vulnerable to many different kinds of issues, such as buffer overflows, arbitrary file access and physical path revelation.

Details

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Buffer Overflows

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Many of the ISAPI DLL applications that form SLWebmail are vulnerable to buffer overflow vulnerabilities. By passsing an overly long values for certain parameters in the query string the overflows can be triggered.

Module: showlogin.dll

Parameter: Language

Module: recman.dll

Parameter: CompanyID

Module: admin.dll

Parameter: CompanyID

Module: globallogin.dll

Parameter: CompanyID

Abritrary File Access

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ShowGodLog.dll can be accessed without requiring a remote user to authenticate. This ISAPI application is used to show SLWebMail’s log file. However, by providing the path, relative or full, to any file that the anonymous Internet account has read access to then access to the contents can be gained, even outside of the web root.

Physical Path Revelation

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By making invalid requests to certain DLLs such as WebMailReq.dll the complete physical path to the DLL is revealed. This information can be used to help with other attacks.

Fix Information

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NGSSoftware alerted SLMail to these issues in February and an update has been released. See http://www.slmail.com for more details.

A check for these issues has been added to Typhon, a comprehensive automated vulnerability assessment tool of which more information is available from the NGSSite: http://www.ngssoftware.com/

About NGSSoftware

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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/

http://www.ngsconsulting.com/

Telephone +44 208 401 0070

Fax +44 208 401 0076

enquiries@ngssoftware.com