Description:
mp3gain is a program to analyze and adjust MP3 files to same volume.
The fuzz was done via the aacgain command-line tool which uses mp3gain which bundles an old-modified version of mpg123 called mpglibDBL.
The upstream project seems to be dead, so the issue wasn’t communicated to them.
The complete ASan output of the issue:
# aacgain -f $FILE
==20037==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000010803e0 at pc 0x0000008dde6c bp 0x7fff0aee7020 sp 0x7fff0aee7018
READ of size 8 at 0x0000010803e0 thread T0
#0 0x8dde6b in III_i_stereo /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:1076
#1 0x8dde6b in do_layer3 /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:1661
#2 0x8ac2f9 in decodeMP3 /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/interface.c:643
#3 0x43e767 in main /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mp3gain.c:2262
#4 0x7f756ace0680 in __libc_start_main (/lib64/libc.so.6+0x20680)
#5 0x4426c8 in _start (/usr/bin/aacgain+0x4426c8)
0x0000010803e0 is located 32 bytes to the left of global variable 'pow2_1' defined in 'layer3.c:109:27' (0x1080400) of size 256
0x0000010803e0 is located 0 bytes to the right of global variable 'pow1_2' defined in 'layer3.c:109:41' (0x10802e0) of size 256
SUMMARY: AddressSanitizer: global-buffer-overflow /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:1076 in III_i_stereo
Shadow bytes around the buggy address:
0x000080208020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080208030: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
0x000080208040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080208050: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 00 00 00
0x000080208060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x000080208070: 00 00 00 00 00 00 00 00 00 00 00 00[f9]f9 f9 f9
0x000080208080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080208090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000802080a0: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
0x0000802080b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000802080c0: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==20037==ABORTING
Affected version:
1.5.2
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-14410
Reproducer:
https://github.com/asarubbo/poc/blob/master/00353-aacgain-globaloverflow-III_i_stereo
Timeline:
2017-08-28: bug discovered
2017-09-08: blog post about the issue
2017-09-13: CVE Assigned
Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.
Permalink:
mp3gain: global buffer overflow in III_i_stereo (mpglibDBL/layer3.c)