TippingPoint Zero Day Initiative

Ipswitch IMail IMAP Daemon SUBSCRIBE Stack Overflow Vulnerability

ZDI-07-043: July 19th, 2007


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 2068. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Ipswitch IMail and ICS server. Authentication is required to exploit this vulnerability.

The specific flaw exists due to a lack of bounds checking during the
parsing of arguments to the SUBSCRIBE IMAP command sent to the IMAP daemon listening by default on TCP port 143. By providing an overly long string as the argument, an exploitable stack-based buffer overflow occurs.

Vendor Response

Ipswitch has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2007-03-09 - Vulnerability reported to vendor
    2007-07-19 - Coordinated public release of advisory


This vulnerability was discovered by:
    Sebastian Apelt (webmaster@buzzworld.org)