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Date: Mon, 1 May 2017 11:40:19 +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_layer_III (layer3.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
==14773==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61e00000fa87 at pc 0x0000004bc8ec bp 0x7ffcda3263d0 sp 0x7ffcda325b80
WRITE of size 2060 at 0x61e00000fa87 thread T0
#0 0x4bc8eb in __asan_memcpy /tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:413
#1 0x7f37ddfa397d in mad_layer_III /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/layer3.c:2635:2
#2 0x7f37ddf6784d in mad_frame_decode /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/frame.c:453:7
#3 0x7f37ddf8c4e4 in run_sync /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/decoder.c:404:11
#4 0x7f37ddf8ac59 in mad_decoder_run /tmp/portage/media-libs/libmad-0.15.1b-r8/work/libmad-0.15.1b/decoder.c:557:12
#5 0x5277a1 in decode /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:1862:12
#6 0x5277a1 in play_one /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:1951
#7 0x5277a1 in play_all /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:2041
#8 0x5215a2 in player_run /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/player.c:2768:14
#9 0x50c46c in main /tmp/portage/media-sound/madplay-0.15.2b-r1/work/madplay-0.15.2b/madplay.c:816:7
#10 0x7f37dce4f78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#11 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.
This bug came out in the past during the debug of mp3splt with Dave Kennedy
CVE:
CVE-2017-8373
Reproducer:
https://github.com/asarubbo/poc/blob/master/00213-libmad-heapoverflow-mad_layer_III
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_layer_iii-layer3-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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