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TSRT-06-07: eIQnetworks Enterprise Security Analyzer Monitoring Agent Buffer Overflow Vulnerabilities

TSRT-06-07: eIQnetworks Enterprise Security Analyzer Monitoring Agent
            Buffer Overflow Vulnerabilities

http://www.tippingpoint.com/security/advisories/TSRT-06-07.html
August 8, 2006

-- CVE ID:
CVE-2006-3838

-- Affected Vendor:
eIQnetworks

-- Affected Products:
Enterprise Security Analyzer

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since July 31, 2006 by Digital Vaccine protection
filter ID 4386. For further product information on the TippingPoint IPS:

    http://www.tippingpoint.com 

-- Vulnerability Details:
These vulnerabilities allow remote attackers to execute arbitrary code
on vulnerable installations of eIQnetworks Enterprise Security
Analyzer. Authentication is not required to exploit these
vulnerabilities.

The first flaw specifically exists within the routines responsible for
handling user-supplied data on TCP port 9999 within Monitoring.exe.
Upon connecting to this port the user is immediately prompted for a
password. A custom string comparison loop is used to validate the
supplied password against the hard-coded value "eiq2esa?", where the
question mark represents any alpha-numeric character. Issuing the
command "HELP" reveals a number of documented commands:

   ---------------------------------------------------------
   Usage:
   QUERYMONITOR: to fetch events for a particular monitor
           QUERYMONITOR&<user>&<monid>&timer
   QUERYEVENTCOUNT or QEC: to get latest event counts
   RESETEVENTCOUNT or REC: to reset event counts
           REC&[ALL] or REC&dev1,dev2,
   STATUS: Display the running status of all the threads
   TRACE:  TRACE&ip or hostname&.  TRACE&OFF& will turn off the trace
   FLUSH: reset monitors as though the hour has changed
   ALRT-OFF and ALRT-ON: toggle the life of alerts-thread.
   RECV-OFF and RECV-ON: toggle the life of event-collection thread.
   EM-OFF and EM-ON toggle event manager
   DMON-OFF and DMON-ON toggle device event monitoring
   HMON-OFF and HMON-ON toggle host event monitoring
   NFMON-OFF and NFMON-ON toggle netflow event monitoring
   HPMON-OFF and HPMON-ON toggle host perf monitoring
   X or EXIT: to close the session
   ---------------------------------------------------------

Supplying a long string to the TRACE command results in an overflow of
the global variable at 0x004B1788. A neighboring global variable, 116
bytes after the overflowed variable, contains a file output stream
pointer that is written to every 30 seconds by a garbage collection
thread. The log message can be influenced and therefore this is a valid
exploit vector, albeit complicated. A trivial exploit vector exists
within the parsing of the actual command at the following equivalent
API call:

    sscanf(socket_data, "%[^&]&%[^&]&", 60_byte_stack_var, global_var);

Because no explicit check is made for the exact command "TRACE", an
attacker can abuse this call to sscanf by passing a long suffix to the
TRACE command that is free of the field terminating character, '&'.
This vector is trivial to exploit.

The second flaw specifically exists within the routines responsible for
handling user-supplied data on TCP port 10626 within Monitoring.exe. The
service will accept up to approximately 16K of data from unauthenticated
clients which is later parsed, in a similar fashion to above, in search
of the delimiting character '&'. Various trivial vectors of
exploitation exist, for example, through the QUERYMONITOR command.

-- Vendor Response:
eIQnetworks has issued an update to correct this vulnerability. More
details can be found at:

    http://www.eiqnetworks.com/products/enterprisesecurity/
        EnterpriseSecurityAnalyzer/ESA_2.5.0_Release_Notes.pdf

-- Disclosure Timeline:
2006.05.10 - Vulnerability reported to vendor
2006.07.31 - Digital Vaccine released to TippingPoint customers
2006.08.08 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by Pedram Amini, TippingPoint Security
Research Team.

-- About the TippingPoint Security Research Team (TSRT):
The TippingPoint Security Research Team (TSRT) consists of industry
recognized security researchers that apply their cutting-edge
engineering, reverse engineering and analysis talents in our daily
operations. More information about the team is available at:

    http://www.tippingpoint.com/security
 
The by-product of these efforts fuels the creation of vulnerability
filters that are automatically delivered to our customers' intrusion
prevention systems through the Digital Vaccine(R) service.