Title: Zone Labs ZoneAlarm MailSafe Bypass Vulnerability
Severity: HIGH
Description:
ZoneAlarm is a Windows firewall. It has the ability to limit which applications can access the network as well as numerous other security features. ZoneAlarm includes a feature called MailSafe that can filter specific filetypes from email attachments. If a prohibited attachment is detected, ZoneAlarm will rename the file extension to '.zl' and continue with the delivery of the email. This is done to protect user's from malicious files (example: .vbs, .exe, .com, etc). Typically, if a user should be legitimately receiving a high risk file, the user would know to rename it with the proper extension.
Due to a flaw in the handling of long filenames, it is possible for a user to bypass the MailSafe feature. If an attachment is composed with an unusually long filename along with a prohibited file extension, ZoneAlarm will treat the illicit file as one of a trusted type.
Successful exploitation of this vulnerability could lead to a complete compromise of the host, and possibly assist in further attacks against the target host.
Affected Products:
- Zone Labs ZoneAlarm 2.1.0
- Zone Labs ZoneAlarm 2.2.0
- Zone Labs ZoneAlarm 2.3.0
- Zone Labs ZoneAlarm 2.4.0
- Zone Labs ZoneAlarm 2.5.0
- Zone Labs ZoneAlarm 2.6.0
- Zone Labs ZoneAlarm Pro 2.4.0
- Zone Labs ZoneAlarm Pro 2.6.0
References:
- Zone Labs: Zone Labs Homepage
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