[NEWS] IDA Pro Format String Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05

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Date: 17 Mar 2005 10:34:10 +0200

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      IDA Pro Format String Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    "The <http://www.datarescue.com/> IDA Pro Disassembler and Debugger is an
    interactive, programmable, extensible, muti-processor disassembler hosted
    on Windows or on Linux". IDA Pro is vulnerable to format string
    vulnerability parsing a loaded DLL name.

    DETAILS

    Vulnerable Systems:
     * IDA Pro version 4.7.0.830

    The problem exist when IDA Debugger tries to write informations about
    loaded dynamic link library (when LOAD_DLL_DEBUG_EVENT /
    UNLOAD_DLL_DEBUG_EVENT occurs)

    Lets look at following sample code to get a better view:
           call a
           db "KERNEL32.DLL",0
           a:
           call LoadLibraryA
           int 3

    The code above should return KERNEL32.DLL base stored in EAX register. IDA
    Debugger shows EAX as: "EAX=77E60000 -> kernel32.dll:77E60000" (general
    registers window) - this is one of the examples. However when loaded
    library name includes special format specifiers the vulnerability takes
    place, here is the vulnerable code:
     (disassembly of ida.wll)
           .text:012563F8 mov esi, [ebp+arg_0]
           .text:012563FB push [ebp+arg_C]
           .text:012563FE push dword_12A27C4
           .text:01256404 push 0
           .text:01256406 push ebx ; format string
           .text:01256407 lea eax, [ebp+arg_0]
           .text:0125640A push eax
           .text:0125640B push offset sub_12562C0
           .text:01256410 call sub_011D1C78 ; parser

    Where EBX contains format specifier supplied by attacker.

    This vulnerability after successful exploitation can allow the attacker to
    run arbitrary code in context of current user. Of course if the
    exploitation was not successful IDA Debugger will fault or IDA can freeze
    (100% CPU - database corruption).Note that an attacker can drop "baddll"
    on the fly, there are few variants.

    Proof of Concept:
    A proof of concept code for this vulnerability can be found at
    <http://pb.specialised.info/all/adv/POC/IdaPOC.zip>
    http://pb.specialised.info/all/adv/POC/IdaPOC.zip.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:bania.piotr@gmail.com> Piotr
    Bania.
    The original article can be found at:
    <http://pb.specialised.info/all/adv/ida-debugger-adv.txt>
    http://pb.specialised.info/all/adv/ida-debugger-adv.txt

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