Ipswitch Collaboration Suite provides e-mail and real-time
collaboration, calendar and contact list sharing, and protection from
spam and viruses, all delivered in an easy to use suite.
Remote exploitation of a format string vulnerability in Ipswitch
IMail allows remote attackers to execute arbitrary code.
The vulnerability specifically exists due to improper use of functions
which allow format specifiers in the SMTP service included with ICS.
Remote attackers can supply format string values to certain string
functions to cause memory corruption leading to remote code execution.
The vulnerability may be exploited by supplying specially crafted
strings to any of the following SMTP commands: EXPN, MAIL, MAIL FROM,
RCPT TO. All of the commands are handled by the same function which
parses user-supplied input strings. The following debugger session
shows a backtrace with user-supplied strings as values. With properly
constructed input value, the strings would be interpreted as memory
addresses that would be executed upon returning from the current
00A7F374 00A7F634 ASCII 5B,"192.168.242.1] MAIL
00A7F380 7C34FC0B RETURN to MSVCR71.7C34FC0B from MSVCR71.write_char
00A7F388 00A7F648 ASCII 20,"FROM:C:appsIpswitchCollaborat"
Successful exploitation of the format string vulnerability allows
unauthenticated remote attackers to execute arbitrary code. Ipswitch
mail services are commonly configured to allow untrusted access. The
use of a firewall or other mitigating strategy is highly recommended
due to the nature of this vulnerability. The IMail SMTP server is
installed by default.
iDEFENSE Labs has confirmed the existence of this vulnerability in
Ipswitch Collaboration Suite 8.20.
iDEFENSE is currently unaware of any effective workarounds for this
issue. Access to the affected host should be filtered at the network
boundary if global accessibility is not required. Restricting access to
only trusted hosts and networks may reduce the likelihood of
Ipswitch Collaboration Suite 2.02 has been released to address this
issue and is available for download at:
IMail Server 8.22 has been released to address this issue and is
available for download at:
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-2931 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
09/08/2005 Initial vendor notification
09/13/2005 Initial vendor response
10/06/2005 Coordinated public disclosure
iDEFENSE credits Nico with the discovery of this vulnerability.
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Copyright © 2005 Verisign, Inc.
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