libmad memory corruption vulnerability
================
Author : qflb.wu
===============


Introduction:
=============
libmad is a high-quality MPEG audio decoder capable of 24-bit output.


Affected version:
=====
0.15.1b


Vulnerability Description:
==========================
the mad_decoder_run function in decoder.c in libmad 0.15.1b can cause a denial of service(memory corruption) via a crafted mp3 file.


I found this bug when I test mpg321 0.3.2 which used the libmad library.


./mpg321 libmad_0.15.1b_memory_corruption.mp3


----debug info:----
Program received signal SIGABRT, Aborted.
0x00007ffff6bf7cc9 in __GI_raise (sig=sig@entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007ffff6bf7cc9 in __GI_raise (sig=sig@entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff6bfb0d8 in __GI_abort () at abort.c:89
#2  0x00007ffff6c34394 in __libc_message (do_abort=do_abort@entry=1, 
    fmt=fmt@entry=0x7ffff6d42b28 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/posix/libc_fatal.c:175
#3  0x00007ffff6c4066e in malloc_printerr (ptr=<optimized out>, 
    str=0x7ffff6d42c58 "double free or corruption (out)", action=1)
    at malloc.c:4996
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0)
    at malloc.c:3840
#5  0x00007ffff749ab43 in mad_decoder_run (
    decoder=decoder@entry=0x7fffffffbd20, 
    mode=mode@entry=MAD_DECODER_MODE_SYNC) at decoder.c:559
#6  0x0000000000403d5d in main (argc=<optimized out>, argv=<optimized out>)
    at mpg321.c:1092
(gdb)


POC:
libmad_0.15.1b_memory_corruption.mp3
CVE:
CVE-2017-11552


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/42409.zip