Title: Baltimore Technologies MAILsweeper Script Filtering Bypass Vulnerability
Severity: HIGH
Description:
Baltimore Technologies MAILsweeper for SMTP is a commercial application for filtering e-mail content at the gateway level.
MAILsweeper does not adequately filter script code from HTML-enabled e-mail. It is possible to use HTML-encoded characters to trick MAILsweeper's filter. Also, adding an additional "<" to the beginning of a HTML tag which includes script code will be sufficient to bypass the script filter.
These examples will cause script code to be executed:
<A HREF="javascript:alert('This part should be filtered')">Click here</A>
<IMG SRC="javascript:alert('This part should be filtered')">
<<IMG SRC="javascript:alert('This part should be filtered')">
Successful exploitation may allow malicious code to be executed on client systems receiving HTML e-mail. This is due to the fact that the malicious e-mail will not be filtered at the gateway level and may affect users within an organization that is using MAILsweeper to filter e-mail content.
Affected Products:
- Baltimore Technologies MAILsweeper for SMTP 4.2.0
- Baltimore Technologies MAILsweeper for SMTP 4.2.1
- Baltimore Technologies MAILsweeper for SMTP 4.2.5
References:
- "edvice Security Services" <support@edvicesecurity.com>: Various problems in Baltimore MailSweeper Script filtering
- Baltimore Technologies: MAILsweeper for SMTP Product Page
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