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Date: Mon, 1 May 2017 11:41:10 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: libmad: heap-based buffer overflow in mad_bit_skip (bit.c)
Description:
libmad stays for “M”peg “A”udio “D”ecoder library.
There is an heap overflow discovered through madplay.
The complete ASan output:
# madplay -v -i -o raw:out $FILE
==12603==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61200000c09f at pc 0x7f72d6aa05c0 bp 0x7fff03e32040 sp 0x7fff03e32038
READ of size 1 at 0x61200000c09f thread T0
#0 0x7f72d6aa05bf in mad_bit_skip /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/bit.c:130:21
#1 0x7f72d6b032ad in III_huffdecode /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/layer3.c:953:3
#2 0x7f72d6b032ad in III_decode /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/layer3.c:2403
#3 0x7f72d6af1a8e in mad_layer_III /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/layer3.c:2648:13
#4 0x7f72d6ab584d in mad_frame_decode /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/frame.c:453:7
#5 0x7f72d6ada4e4 in run_sync /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/decoder.c:404:11
#6 0x7f72d6ad8c59 in mad_decoder_run /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/decoder.c:557:12
#7 0x5277a1 in decode /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:1862:12
#8 0x5277a1 in play_one /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:1951
#9 0x5277a1 in play_all /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:2041
#10 0x5215a2 in player_run /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:2768:14
#11 0x50c46c in main /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/madplay.c:816:7
#12 0x7f72d599d78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#13 0x41aa78 in _init (/usr/bin/madplay+0x41aa78)
Affected version:
0.15.1b
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8374
Reproducer:
https://github.com/asarubbo/poc/blob/master/00211-libmad-heapoverflow-mad_bit_skip
Timeline:
2017-01-01: bug discovered and reported to upstream
2017-04-30: blog post about the issue
2017-05-01: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/30/libmad-heap-based-buffer-overflow-in-mad_bit_skip-bit-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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