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.
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