Signature Detail

POP3: Hyperterm (.HT) File Attachment

This signature detects e-mail attachments with the extension ".ht" sent through POP3. This can indicate an incoming e-mail virus or other attack. HT files contain configuration information for the Hyperterm console program, shipped with every Windows operating system since Windows 95. It is the default handler program for .ht files. A recent vulnerability in Hyperterm could allow an attacker to take control of your computer through an infected .ht file. These files are not normally sent through email.

Extended Description

A remote buffer overflow vulnerability affects the session parsing functionality of Hilgraeve HyperTerminal. HyperTerminal is shipped and installed with every copy of Microsoft Windows 98, ME, NT 4.0, 2000, XP, and 2003. It is the default telnet client in Microsoft 98 and ME, but not in Windows NT 4.0, 2000, XP, and 2003. This issue is due to a failure of the application to properly validate the length of session-related strings prior to copying them into static process buffers. This may be triggered by a malicious session file or through a telnet URI in circumstances where HyperTerminal is configured to be the default handler for the telnet protocol. An attacker may exploit this issue to execute arbitrary code with the privileges of the unsuspecting user that activates the vulnerable application. This may facilitate unauthorized access or privilege escalation.

Affected Products

• Microsoft Windows 2000 Advanced Server SP1
• Microsoft Windows 2000 Advanced Server SP2
• Microsoft Windows 2000 Advanced Server SP3
• Microsoft Windows 2000 Advanced Server SP4
• Microsoft Windows 2000 Advanced Server
• Microsoft Windows 2000 Datacenter Server SP1
• Microsoft Windows 2000 Datacenter Server SP2
• Microsoft Windows 2000 Datacenter Server SP3
• Microsoft Windows 2000 Datacenter Server SP4
• Microsoft Windows 2000 Datacenter Server
• Microsoft Windows 2000 Professional SP1
• Microsoft Windows 2000 Professional SP2
• Microsoft Windows 2000 Professional SP3
• Microsoft Windows 2000 Professional SP4
• Microsoft Windows 2000 Professional
• Microsoft Windows 2000 Server SP1
• Microsoft Windows 2000 Server SP2
• Microsoft Windows 2000 Server SP3
• Microsoft Windows 2000 Server SP4
• Microsoft Windows 2000 Server
• Microsoft Windows 98 A
• Microsoft Windows 98 B
• Microsoft Windows 98 J
• Microsoft Windows 98 SP1
• Microsoft Windows 98
• Microsoft Windows 98SE
• Microsoft Windows ME
• Microsoft Windows NT 4.0
• Microsoft Windows NT 4.0 alpha
• Microsoft Windows NT 4.0 SP1
• Microsoft Windows NT 4.0 SP1 alpha
• Microsoft Windows NT 4.0 SP2
• Microsoft Windows NT 4.0 SP2 alpha
• Microsoft Windows NT 4.0 SP3
• Microsoft Windows NT 4.0 SP3 alpha
• Microsoft Windows NT 4.0 SP4
• Microsoft Windows NT 4.0 SP4 alpha
• Microsoft Windows NT 4.0 SP5
• Microsoft Windows NT 4.0 SP5 alpha
• Microsoft Windows NT 4.0 SP6
• Microsoft Windows NT 4.0 SP6a
• Microsoft Windows NT 4.0 SP6a alpha
• Microsoft Windows NT 4.0 SP6 alpha
• Microsoft Windows NT Enterprise Server 4.0
• Microsoft Windows NT Enterprise Server 4.0 SP1
• Microsoft Windows NT Enterprise Server 4.0 SP2
• Microsoft Windows NT Enterprise Server 4.0 SP3
• Microsoft Windows NT Enterprise Server 4.0 SP4
• Microsoft Windows NT Enterprise Server 4.0 SP5
• Microsoft Windows NT Enterprise Server 4.0 SP6
• Microsoft Windows NT Enterprise Server 4.0 SP6a
• Microsoft Windows NT Server 4.0
• Microsoft Windows NT Server 4.0 SP1
• Microsoft Windows NT Server 4.0 SP2
• Microsoft Windows NT Server 4.0 SP3
• Microsoft Windows NT Server 4.0 SP4
• Microsoft Windows NT Server 4.0 SP5
• Microsoft Windows NT Server 4.0 SP6
• Microsoft Windows NT Server 4.0 SP6a
• Microsoft Windows NT Terminal Server 4.0
• Microsoft Windows NT Terminal Server 4.0 alpha
• Microsoft Windows NT Terminal Server 4.0 SP1
• Microsoft Windows NT Terminal Server 4.0 SP2
• Microsoft Windows NT Terminal Server 4.0 SP3
• Microsoft Windows NT Terminal Server 4.0 SP4
• Microsoft Windows NT Terminal Server 4.0 SP5
• Microsoft Windows NT Terminal Server 4.0 SP6
• Microsoft Windows NT Terminal Server 4.0 SP6a
• Microsoft Windows NT Workstation 4.0
• Microsoft Windows NT Workstation 4.0 SP1
• Microsoft Windows NT Workstation 4.0 SP2
• Microsoft Windows NT Workstation 4.0 SP3
• Microsoft Windows NT Workstation 4.0 SP4
• Microsoft Windows NT Workstation 4.0 SP5
• Microsoft Windows NT Workstation 4.0 SP6
• Microsoft Windows NT Workstation 4.0 SP6a
• Microsoft Windows Server 2003 Datacenter Edition SP1 Beta 1
• Microsoft Windows Server 2003 Datacenter Edition
• Microsoft Windows Server 2003 Datacenter Edition Itanium SP1 Beta 1
• Microsoft Windows Server 2003 Datacenter Edition Itanium
• Microsoft Windows Server 2003 Enterprise Edition SP1 Beta 1
• Microsoft Windows Server 2003 Enterprise Edition
• Microsoft Windows Server 2003 Enterprise Edition Itanium SP1 Beta 1
• Microsoft Windows Server 2003 Enterprise Edition Itanium
• Microsoft Windows Server 2003 Standard Edition SP1 Beta 1
• Microsoft Windows Server 2003 Standard Edition
• Microsoft Windows Server 2003 Web Edition SP1 Beta 1
• Microsoft Windows Server 2003 Web Edition
• Microsoft Windows XP 64-bit Edition SP1
• Microsoft Windows XP 64-bit Edition
• Microsoft Windows XP 64-bit Edition Version 2003 SP1
• Microsoft Windows XP 64-bit Edition Version 2003
• Microsoft Windows XP Home SP1
• Microsoft Windows XP Home SP2
• Microsoft Windows XP Home
• Microsoft Windows XP Media Center Edition SP1
• Microsoft Windows XP Media Center Edition SP2
• Microsoft Windows XP Media Center Edition
• Microsoft Windows XP Professional SP1
• Microsoft Windows XP Professional SP2
• Microsoft Windows XP Professional

References

• CVE: CVE-2004-0568
• URL: http://www.hilgraeve.com/htpe/
• URL: http://filext.com/detaillist.php?extdetail=ht
• URL: http://www.microsoft.com/technet/security/bulletin/MS04-043.mspx