Title: Network Associates WebShield SMTP Malformed Mime Header Vulnerability
Severity: HIGH
Description:
WebShield SMTP is a gateway product designed to parse and scan incoming email for malicious content, including virus and worm attachments. MIME is a standard encoding scheme used for multi-part messages, including file attachments in email.
WebShield includes functionality to parse MIME attached files from email messages, and apply additional filtering rules to them. It may scan attachments with a virus scanning engine, or block attachments with suspect file extensions such as '.scr' or '.pif'.
The MIME encoded file attachments that do not follow the MIME specification may not be recognized as attachments by WebShield. Some email clients, however, will recognize these malformed MIME encodings as valid, treating this content as a valid file attachment.
As WebShield does not recognize the content as an attachment, it is not subject to file based content filtering rules. Additionally, as the attachment is not recognized as a file, it will not be scanned for viruses.
Individuals have reported cases of the W32/Badtrans.B virus bypassing WebShield in this manner.
Older versions of WebShield may also be vulnerable.
Affected Products:
- Network Associates VirusScan for Windows NT 4.5.0
References:
- Network Associates Inc.: WebShield SMTP Product Home Page
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