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Message-ID: <521982.786801772-sendEmail@localhost>
Date: Mon, 1 May 2017 11:26:02 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: libsndfile: invalid memory read in flac_buffer_copy (flac.c)
Description:
libsndfile is a C library for reading and writing files containing sampled sound.
The complete ASan output of the issue:
# sndfile-resample -to 24000 -c 1 $FILE out
==19624==ERROR: AddressSanitizer: SEGV on unknown address 0x000000004000 (pc 0x7fe14fe3f2b3 bp 0x000000004000 sp 0x7ffcb49c4d50 T0)
==19624==The signal is caused by a READ memory access.
#0 0x7fe14fe3f2b2 in flac_buffer_copy /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:287
#1 0x7fe14fe403d7 in flac_read_loop /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:928
#2 0x7fe14fe404d4 in flac_read_flac2f /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:999
#3 0x7fe14fe34925 in sf_readf_float /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/sndfile.c:1945
#4 0x50a525 in sample_rate_convert /tmp/portage/media-libs/libsamplerate-0.1.9/work/libsamplerate-0.1.9/examples/sndfile-resample.c:206:29
#5 0x50a525 in main /tmp/portage/media-libs/libsamplerate-0.1.9/work/libsamplerate-0.1.9/examples/sndfile-resample.c:156
#6 0x7fe14ef70680 in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#7 0x419fa8 in _init (/usr/bin/sndfile-resample+0x419fa8)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/flac.c:287 in flac_buffer_copy
==19624==ABORTING
Affected version:
1.0.28
Fixed version:
N/A
Commit fix:
https://github.com/erikd/libsndfile/commit/ef1dbb2df1c0e741486646de40bd638a9c4cd808
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8362
Reproducer:
https://github.com/asarubbo/poc/blob/master/00264-libsndfile-invalidread-flac_buffer_copy
Timeline:
2017-04-12: bug discovered and reported to upstream
2017-04-14: upstream released a patch
2017-04-29: blog post about the issue
2017-04-30: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2017/04/29/libsndfile-invalid-memory-read-in-flac_buffer_copy-flac-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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