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Date: Thu, 14 Sep 2017 07:01:45 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: mp3gain: global buffer overflow in III_dequantize_sample (mpglibDBL/layer3.c)

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:
https://blogs.gentoo.org/ago/2017/09/08/mp3gain-global-buffer-overflow-in-iii_dequantize_sample-mpglibdbllayer3-c/

--
Agostino Sarubbo
Gentoo Linux Developer


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