EMC IRM License Server DoS Server 4.6.1.1995

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                             Luigi Auriemma

Application:  EMC IRM License Server
              http://www.emc.com
Versions:     <= 4.6.1.1995
Platforms:    Windows
Bugs:         A] "version compat check" *FIPS NULL pointer
              B] freezing caused by multiple commands
              C] NULL pointer caused by commands after invalid version
Exploitation: remote
Date:         10 Apr 2012
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org

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1) Introduction
2) Bugs
3) The Code
4) Fix

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1) Introduction
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From the manual:
"The IRM Server is a secure server containing a database that stores
the encryption keys needed by authorized users to access protected
content. The database also stores policies that specify who can access
the information and what they can do with it."

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2) Bugs
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A] "version compat check" *FIPS NULL pointer
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The missing *FIPS fields in the "version compat check" command leads to
a NULL pointer in execution:

  004AB67B   . 8D45 E4          LEA EAX,DWORD PTR SS:[EBP-1C]
  004AB67E   . 50               PUSH EAX
  004AB67F   . 53               PUSH EBX
  004AB680   . 8D85 5C020000    LEA EAX,DWORD PTR SS:[EBP+25C]
  004AB686   . 50               PUSH EAX
  004AB687   . FF75 C4          PUSH DWORD PTR SS:[EBP-3C]
  004AB68A   . FF55 E8          CALL DWORD PTR SS:[EBP-18]  ; NULL pointer

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B] freezing caused by multiple commands
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Process freezing caused by some continuous malformed commands, for
example "batch begin untethered" with an Id composed by line-feeds.

Note about the proof-of-concept: manually kill the PoC when everything
seems inactive and you no longer receive data from the server so that
it will start to consume resources.

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C] NULL pointer caused by commands after invalid version
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Looks like it's possible to cause some NULL pointer dereferences if the
initial "version compat check" contains an invalid Version and then are
sent other commands.

The effect of all the vulnerabilities is the impossibility of using the
IRM server, the pvcontrol.exe process remains active but it's no longer
usable.

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3) The Code
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http://aluigi.org/poc/irm_1.zip

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4) Fix
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No fix.

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