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
==23791==ERROR: AddressSanitizer: global-buffer-overflow on address 0x00000107ff80 at pc 0x0000008e2acc bp 0x7fff34f7d100 sp 0x7fff34f7d0f8
WRITE of size 8 at 0x00000107ff80 thread T0
#0 0x8e2acb in III_dequantize_sample /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:779
#1 0x8e2acb in do_layer3 /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:1646
#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 0x7f36927b3680 in __libc_start_main (/lib64/libc.so.6+0x20680)
#5 0x4426c8 in _start (/usr/bin/aacgain+0x4426c8)
0x00000107ff80 is located 32 bytes to the left of global variable 'sideinfo' defined in 'layer3.c:1521:21' (0x107ffa0) of size 488
0x00000107ff80 is located 0 bytes to the right of global variable 'hybridIn' defined in 'layer3.c:1612:17' (0x107db80) of size 9216
SUMMARY: AddressSanitizer: global-buffer-overflow /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mpglibDBL/layer3.c:779 in III_dequantize_sample
Shadow bytes around the buggy address:
0x000080207fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080207fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080207fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080207fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080207fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x000080207ff0:[f9]f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
0x000080208000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080208010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
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
==23791==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-2017-14409
Reproducer:
https://github.com/asarubbo/poc/blob/master/00350-aacgain-globaloverflow-III_dequantize_sample
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_dequantize_sample (mpglibDBL/layer3.c)