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Message-ID: <919635.76744044-sendEmail@localhost>
Date: Thu, 14 Sep 2017 06:59:47 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: mp3gain: stack-based buffer overflow in filterYule (gain_analysis.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.
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
==18941==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7f2d1e9cd520 at pc 0x00000088af27 bp 0x7ffc10f47b20 sp 0x7ffc10f47b18
READ of size 8 at 0x7f2d1e9cd520 thread T0
#0 0x88af26 in filterYule /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/gain_analysis.c:195
#1 0x88bfcc in AnalyzeSamples /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/gain_analysis.c:344
#2 0x43e89a in main /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mp3gain.c:2281
#3 0x7f2d21465680 in __libc_start_main (/lib64/libc.so.6+0x20680)
#4 0x4426c8 in _start (/usr/bin/aacgain+0x4426c8)
Address 0x7f2d1e9cd520 is located in stack of thread T0 at offset 9504 in frame
#0 0x4341ff in main /var/tmp/portage/media-sound/aacgain-1.9/work/aacgain-1.9/mp3gain/mp3gain.c:1411
This frame has 7 object(s):
[32, 33) 'maxgain'
[96, 97) 'mingain'
[160, 164) 'nprocsamp'
[224, 232) 'maxsample'
[288, 9504) 'lsamples' 0x0fe623d31aa0: 00 00 00 00[f2]f2 f2 f2 00 00 00 00 00 00 00 00
0x0fe623d31ab0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe623d31ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe623d31ad0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe623d31ae0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe623d31af0: 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
==18941==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-2017-14407
Reproducer:
https://github.com/asarubbo/poc/blob/master/00345-aacgain-stackoverflow-filterYule
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-stack-based-buffer-overflow-in-filteryule-gain_analysis-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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