[SA20756] MAILsweeper for SMTP/Exchange Multiple Vulnerabilities

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TITLE:
MAILsweeper for SMTP/Exchange Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA20756

VERIFY ADVISORY:
http://secunia.com/advisories/20756/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

SOFTWARE:
CS MAILsweeper 4.x for Exchange 2000
http://secunia.com/product/205/
CS MAILsweeper 4.x for SMTP
http://secunia.com/product/202/

DESCRIPTION:
Some vulnerabilities have been reported in MAILsweeper for
SMTP/Exchange, which can be exploited by malicious people to bypass
certain security restrictions and potentially cause a DoS (Denial of
Service).

1) An error exists within the handling of messages that specify a
non-existent character set. This can be exploited to bypass text
analysis.

2) An error exists within the handling of reverse DNS lookups when
the "Received" header in a message includes non-ASCII characters.
This can be exploited to cause the Receiver service to stop
processing messages.

3) An error exists within the handling of certain malformed messages.
This can be exploited to cause the Security service to stop processing
messages.

The vulnerabilities have been reported in the following products:

• MAILsweeper for SMTP version 4.3.19
• MIMEsweeper for Exchange version 4.3.19

Prior versions may also be affected.

SOLUTION:
Update to version 4.3.20 (requires 4.3.19).

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://download.mimesweeper.com/www/TechnicalDocumentation/ReadMe_MSW_4,3,20.htm

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