Rule: -- Sid: 2216 -- Summary: This event is generated when an attempt is made to access readmail.cgi on an internal web server. This may indicate an attempt to exploit a buffer overflow vulnerability in Ipswitch IMail 7.04 and earlier. -- Impact: Denial of service. -- Detailed Information: Ipswitch IMail is a mail server that supports multiple mail protocols. Its web mail implementation contains a vulnerability in readmail.cgi where, if a mailbox name with more than 248 dot characters (.) is requested, the server will crash. It has also been reported that this is caused by a buffer overflow error that may allow an attacker to execute arbitrary code, but this has not been confirmed. -- Affected Systems: Mail servers running Ipswitch Imail 7.04 and earlier with web mail enabled. -- Attack Scenarios: An attacker sends an HTTP request to readmail.cgi for a mailbox with more than 248 dot characters in the mailbox name parameter. The mail server will crash and must be restarted. -- Ease of Attack: Simple. -- False Positives: If a legitimate remote user accesses readmail.cgi, this rule may generate an event. -- False Negatives: None known. -- Corrective Action: Upgrade to a newer version or apply the vendor-supplied hotfix available at ftp://ftp.ipswitch.com/Ipswitch/Product_Support/IMail/imail704.exe. -- Contributors: Sourcefire Research Team Brian Caswell <bmc@sourcefire.com> Nigel Houghton <nigel.houghton@sourcefire.com> Sourcefire Technical Publications Team Jennifer Harvey <jennifer.harvey@sourcefire.com> -- Additional References: Bugtraq http://www.securityfocus.com/bid/3427 --
