Ipswitch IMail IMAP List Command DoS Vulnerability
iDEFENSE Security Advisory 12.06.05
www.idefense.com/application/poi/display?id=347&type=vulnerabilities
December 6, 2005
I. BACKGROUND
Ipswitch Imail Server is an email server that is part of the IpSwitch
Collaboration suit. Imail Supports POP3, SMTP, IMAP and web based email
access. More Information can be located on the vendor’s site at:
Remote exploitation of a denial of service (DoS) vulnerability in
Ipswitch Inc.'s Imail IMAP server allows attackers to crash the target
service, thereby preventing legitimate use.
The problem specifically exists in handling long arguments to the LIST
command. When a LIST command of approximately 8000 bytes is supplied,
internal string parsing routines can be manipulated in such a way as to
reference non-allocated sections of memory. This parsing error results
in an unhandled access violation, forcing the daemon to exit.
III. ANALYSIS
Exploitation allows remote attackers to crash vulnerable IMAP servers
and thereby prevent legitimate usage. The LIST command is only available
post authentication and therefore valid credentials are required to
exploit this vulnerability.
IV. DETECTION
iDEFENSE has confirmed the existence of this vulnerability in Ipswitch
IMail 8.2.
V. WORKAROUND
As this vulnerability is exploited after authentication occurs, ensuring
that only trusted users have accounts can mitigate the risk somewhat. As
a more effective workaround, consider limiting access to the IMAP server
by filtering TCP port 143. If possible, consider disabling IMAP and
forcing users to use POP3.
VI. VENDOR RESPONSE
Ipswitch Collaboration Suite 2.02 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-2005-2923 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.
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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
Re: Suggestions please for what POP or IMAP servers to use ... If your server implementation is so strict that most clients have ... Outlook works just fine in IMAP mode with uw-imap, ... Microsoft tested stuff like IE7 against Apache during IE7 development, ... (freebsd-questions)
Re: IMAP not defaulting sent/drafts folder ... a rule to save sent items on an IMAP Server,... Please refer to the following KB article to save Sent Items on an IMAP... Click the folder from which you want to remove deleted messages. ...Microsoft is providing this information as a convenience to you. ... (microsoft.public.windows.server.sbs)
Re: [SLE] POP Mail HOWTO? ... people, who have the option to log onto the serving machine and read mail from there, OR to read their mail from other PCs in the building, then you want fetchmail and and IMAP server to all start and run as processes when the machine boots. ... or can it handle /data/Maildir for the non-local subscribers as well as individual ~/Maildir for those who have local login accounts?... (SuSE)
Re: send email ... Yours, the *mail server*, presumably ... The client wants to be able to send ... server via one of two protocols, POP or IMAP.... (alt.os.linux.redhat)
