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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