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 (firstname.lastname@example.org) Mark Litchfield (email@example.com) Date: 7th May 2003 Advisory URL: http://www.nextgenss.com/advisories/slwebmail-vulns.txt Advisory number: #NISR07052003B
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.
Many of the ISAPI DLL applications that form SLWebmail are vulnerable to buffer overflow vulnerabilities. By passsing an overly long value 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
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
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.
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/
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.
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