[NT] Ipswitch IMail IMAP Vulnerabilities (Multiple Buffer Overflow, Multiple DoS, Directory Traversal)
From: SecuriTeam (support_at_securiteam.com)
Date: 05/25/05
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To: list@securiteam.com Date: 25 May 2005 11:39:48 +0200
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Ipswitch IMail IMAP Vulnerabilities (Multiple Buffer Overflow, Multiple
DoS, Directory Traversal)
------------------------------------------------------------------------
SUMMARY
<http://www.ipswitch.com/> Ipswitch Collaboration Suite (ICS) 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
package designed with the unique needs of small and medium sized
businesses in mind".
Ipswitch IMail was found vulnerable for Multiple Buffer overflow
vulnerabilities that allow attackers to remotely execute arbitrary code on
the server. A directory Traversal vulnerability also was found, that allow
attackers to remotely view files on the server. A denial of service
vulnerability was also found with the server, that attackers can make the
server to stop responding.
DETAILS
Vulnerable Systems:
* Ipswitch IMail version 8.13
* Ipswitch IMail version 8.12
Immune Systems:
* Ipswitch IMail Server 8.2 Hotfix 2
SELECT Command DoS:
Remote exploitation of a denial of service vulnerability in Ipswitch
Inc.'s IMail IMAP server allows attackers to crash the target service
thereby preventing legitimate usage.
The problem specifically exists in the handling of long arguments to the
SELECT command. When a string approximately 260 bytes in size is supplied
a stack-based buffer overflow occurs that results in an unhandled access
violation forcing the daemon to exit. The issue is not believed to be
further exploitable.
Successful exploitation allows remote to crash vulnerable IMAP servers and
thereby prevent legitimate usage. The SELECT command is only available
post authentication and therefore valid credentials are required to
exploit this vulnerability
LSUB DoS:
Remote exploitation of a denial of service (DoS) vulnerability in Ipswitch
Inc.'s IMail IMAP daemon allows attackers to cause 100 percent CPU use on
the server, thereby preventing legitimate users from retrieving e-mail.
The problem specifically exists within IMAPD32.EXE upon parsing a
malformed LSUB command. An attacker can cause the daemon to produce heavy
load by transmitting a long string of NULL characters to the 'LSUB' IMAP
directive. This, in turn, causes an infinite loop, eventually exhausting
all available system resources and causing a denial of service.
Exploitation allows unauthenticated remote attackers to render the IMAP
server useless, thereby preventing legitimate users from retrieving e-
mail. This attack takes few resources to launch and can be repeated to
ensure that an unpatched system is unable to recover. Exploitation
requires a valid IMAP account, thus limiting the impact of this
vulnerability.
Directory Traversal:
Remote exploitation of a directory traversal vulnerability in Ipswitch
Inc.'s IMail Web Calendaring server allows attackers to read arbitrary
files with System privileges.
The problem specifically exists because of a flaw in the handling of
requests for nonexistent JavaScript (jsp) files. By requesting a
nonexistent jsp file followed by a question mark, several sequences of
"..\" and then the path to a file on the system, an attacker can read
arbitrary files remotely without any authentication.
Proof of Concept:
The following query demonstrates how the system's boot.ini file may be
retrieved:
GET /bla.jsp?\..\..\..\..\..\..\..\..\..\..\boot.ini HTTP/1.0
Connection: Close
Host: example.com
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
Pragma: no-cache
Successful exploitation allows remote attackers to retrieve arbitrary
files from the target host. Exploitation does not require authentication
and does not require exploit code, as a user can simply type the malicious
query in a web browser.
LOGIN Remote Buffer Overflow:
Remote exploitation of several buffer overflow vulnerabilities in Ipswitch
Inc.'s IMail IMAP server allows attackers to execute arbitrary code with
System privileges.
The first vulnerability specifically exists in the handling of a long
username to the LOGIN command. A long username argument of approximately
2,000 bytes will cause a stack based Unicode string buffer overflow
providing the attacker with partial control over EIP. As this
vulnerability is in the LOGIN command itself, valid credentials are not
required.
The second vulnerability also exists in the handling of the LOGIN command
username argument, however it lends itself to easier exploitation. If a
large username starting with one of several special characters is
specified, a stack overflow occurs, allowing an attacker to overwrite the
saved instruction pointer and control execution flow.
Included in the list of special characters are the following: % : * @ &,
Both of these vulnerabilities can lead to the execution of arbitrary code.
Successful exploitation allows remote attackers to execute arbitrary code
with System privileges. Valid credentials are not required to for
exploitation, which heightens the impact of this vulnerability.
STATUS Remote Buffer Overflow:
Remote exploitation of a buffer overflow vulnerability in Ipswitch Inc.'s
IMail IMAP server allows attackers to execute arbitrary code with System
privileges.
The vulnerability specifically exists in the handling of a long mailbox
name to the STATUS command. A long mailbox name argument will cause a
stack based buffer overflow, providing the attacker with full control over
the saved return address on the stack. Once this has been achieved,
execution of arbitrary code becomes trivial. As this vulnerability is in
the STATUS command, which requires that a session is authenticated, valid
credentials are required.
Successful exploitation allows remote attackers to execute arbitrary code
with System privileges. Valid credentials are required for exploitation,
which lessens the impact of this vulnerability.
Workaround:
* Consider limiting access to the IMAP server by filtering TCP port 143.
If possible, consider disabling IMAP and forcing users to use POP3.
* Limit access to the Web Calendaring server by allowing only trusted
hosts to access TCP port 8484, the default port for Web Calendaring. If
the Web Calendaring service is not required, disable it entirely.
Vendor Status:
The vendor has released the following patch to fix this vulnerability:
<ftp://ftp.ipswitch.com/Ipswitch/Product_Support/IMail/imail82hf2.exe>
ftp://ftp.ipswitch.com/Ipswitch/Product_Support/IMail/imail82hf2.exe
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1249>
CAN-2005-1249
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1252>
CAN-2005-1252
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1254>
CAN-2005-1254
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1255>
CAN-2005-1255
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1256>
CAN-2005-1256
Disclosure Timeline:
04/15/2005 - Initial vendor notification
05/10/2005 - Initial vendor response
05/24/2005 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@idefense.com> idlabs.
The original article can be found at:
<http://www.idefense.com/application/poi/display?id=241&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=241&type=vulnerabilities,
<http://www.idefense.com/application/poi/display?id=242&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=242&type=vulnerabilities,
<http://www.idefense.com/application/poi/display?id=243&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=243&type=vulnerabilities,
<http://www.idefense.com/application/poi/display?id=244&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=244&type=vulnerabilities,
<http://www.idefense.com/application/poi/display?id=245&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=245&type=vulnerabilities
The Vendor advisory can be found at:
<http://www.ipswitch.com/support/imail/releases/imail_professional/im82hf2.html> http://www.ipswitch.com/support/imail/releases/imail_professional/im82hf2.html
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