libao 1.2.0 – Denial of Service
libao memory corruption vulnerability ================ Author : qflb.wu =============== Introduction: ============= Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms. Affected version: ===== 1.2.0 Vulnerability Description: ========================== the _tokenize_matrix function in audio_out.c in Xiph.Org libao 1.2.0 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 libao library. ./mpg321 libao_1.2.0_memory_corruption.mp3 ----debug info:---- Program received signal SIGSEGV, Segmentation fault. _int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3) at malloc.c:3740 3740malloc.c: No such file or directory. (gdb) bt #0 _int_malloc (av=av@entry=0x7ffff6f7f760 <main_arena>, bytes=bytes@entry=3) at malloc.c:3740 #1 0x00007ffff6c442cc in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3219 #2 0x00007ffff728e189 in _tokenize_matrix () from /usr/local/lib/libao.so.4 #3 0x00007ffff728e607 in _matrix_to_channelmask () from /usr/local/lib/libao.so.4 #4 0x00007ffff72906f2 in _open_device () from /usr/local/lib/libao.so.4 #5 0x000000000040a6aa in open_ao_playdevice (header=header@entry=0x624af8) at ao.c:411 #6 0x0000000000407e50 in output (data=<optimized out>, header=0x624af8, pcm=0x627f44) at mad.c:974 #7 0x00007ffff749a85c in run_sync (decoder=0x7fffffffbc40) at decoder.c:439 #8 0x00007ffff749ab38 in mad_decoder_run ( decoder=decoder@entry=0x7fffffffbc40, mode=mode@entry=MAD_DECODER_MODE_SYNC) at decoder.c:557 #9 0x0000000000403d5d in main (argc=<optimized out>, argv=<optimized out>) at mpg321.c:1092 (gdb) POC: libao_1.2.0_memory_corruption.mp3 CVE: CVE-2017-11548 Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42400.zip |