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Date: Mon, 1 May 2017 11:29:58 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: libsndfile: global buffer overflow in i2les_array (pcm.c)
Description:
libsndfile is a C library for reading and writing files containing sampled sound.
The complete ASan output of the issue:
# sndfile-convert $FILE out.wav
==27948==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0000013cd13c at pc 0x7f59caaaaace bp 0x7ffcab360cf0 sp 0x7ffcab360ce8
READ of size 4 at 0x0000013cd13c thread T0
#0 0x7f59caaaaacd in i2les_array /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/pcm.c:670:15
#1 0x7f59caaaaacd in pcm_write_i2les /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/pcm.c:1696
#2 0x7f59ca7bf831 in sf_writef_int /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/sndfile.c:2342:10
#3 0x514b70 in sfe_copy_data_int /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/programs/common.c:88:3
#4 0x5138d1 in main /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/programs/sndfile-convert.c:340:3
#5 0x7f59c974178f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#6 0x419e18 in _init (/usr/bin/sndfile-convert+0x419e18)
0x0000013cd13c is located 4092 bytes to the right of global variable 'data' defined in '/tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/programs/common.c:80:14'
(0x13c8140) of size 16384
SUMMARY: AddressSanitizer: global-buffer-overflow /tmp/portage/media-libs/libsndfile-1.0.28/work/libsndfile-1.0.28/src/pcm.c:670:15 in i2les_array
Shadow bytes around the buggy address:
0x0000802719d0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000802719e0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000802719f0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x000080271a00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x000080271a10: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x000080271a20: f9 f9 f9 f9 f9 f9 f9[f9]00 00 00 00 00 00 00 00
0x000080271a30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080271a40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080271a50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080271a60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x000080271a70: 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
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
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
==27948==ABORTING
Affected version:
1.0.28
Fixed version:
N/A
Commit fix:
https://github.com/erikd/libsndfile/commit/fd0484aba8e51d16af1e3a880f9b8b857b385eb3
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8365
Reproducer:
https://github.com/asarubbo/poc/blob/master/00263-libsndfile-globaloverflow-i2les_array
Timeline:
2017-04-11: bug discovered and reported to upstream
2017-04-12: 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-global-buffer-overflow-in-i2les_array-pcm-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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