On the 17th of March 2003 Clearswift released a hotfix (4.3.7) for MAILsweeper version 4.3. In the accompanied Readme file (http://www.mimesweeper.com/download/bin/Patches/MAILsweeper_Patches_301_ReadMe.htm) three vulnerabilities are reported. The first vulnerability is the MIME evasion vulnerability which was reported by Corsaire.
The other two vulnerabilities are: 1. MAILsweeper for SMTP Version 4.3.6 (SP1) ignored the classification configured for the On strip unsuccessful scenario outcome if a detected attachment could not be removed from the message. This was the case for all scenarios that have the ability to strip attachments. MAILsweeper for SMTP Version 4.3.7 now follows the specified classification in the event that the attachment cannot be removed successfully.
As a result of these changes, the behavior of the Attachment Stripper scenario upon detecting certain format types that appear outside of an attachment has changed from Version 4.3.6 (SP1). For detailed information on the effect of these changes, see the Technotes under the (Support page) of the MIMEsweeper website.
2. A fix to a memory leak in the MAILsweeper for SMTP Delivery service.
I tried to find more information on the Internet for these two vulnerabilities, but I couldn't find any information. I contacted Clearswift for additional information, but several attempts failed, because they won't help companies or people without a Premium Support contract.
I am wondering if these vulnerabilties are security related and could be exploited by a local or remote attacker. The reason I am looking for this information is that the company I am working for has it's own vulnerability and alerting service for customers. We inform our customers when security vulnerabilities are discovered in the software products they use and how they can resolve this. The brief description in the ReadMe file, doesn't give me enough information to judge if these vulnerabilities are security related.
I hope anybody can provide me additional information.
Regards,
Erwin
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