Description:
imageworsener is a utility for image scaling and processing.
There is a memory allocation failure, I will show the interesting ASan output,
# imagew $FILE /tmp/out -outfmt bmp
#8 0x551fc0 in my_mallocfn /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:794:9
#9 0x7f37f140c9ae in iw_malloc_ex /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-util.c:48:8
#10 0x7f37f140cdec in iw_malloc_large /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-util.c:77:9
#11 0x7f37f136d66c in bmpr_read_uncompressed /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-bmp.c:665:32
#12 0x7f37f134ce64 in iwbmp_read_bits /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-bmp.c:910:7
#13 0x7f37f134ce64 in iw_read_bmp_file /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-bmp.c:980
#14 0x7f37f1349f94 in iw_read_file_by_fmt /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-allfmts.c:66:12
#15 0x519304 in iwcmd_run /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:1191:6
#16 0x515326 in iwcmd_main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3018:7
#17 0x515326 in main /tmp/portage/media-gfx/imageworsener-1.3.0/work/imageworsener-1.3.0/src/imagew-cmd.c:3067
#18 0x7f37f035178f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
#19 0x41b028 in _init (/usr/bin/imagew+0x41b028)
Affected version:
1.3.0
Fixed version:
1.3.1
Commit fix:
https://github.com/jsummers/imageworsener/commit/86564051db45b466e5f667111ce00b5eeedc8fb6
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-8327
Reproducer:
https://github.com/asarubbo/poc/blob/master/00276-imageworsener-memallocfailure
Timeline:
2017-04-13: bug discovered and reported to upstream
2017-04-12: upstream released a patch for another issue that fixes this issue too
2017-04-27: blog post about the issue
2017-04-29: CVE assigned
Note:
This bug was found with American Fuzzy Lop.
Permalink:
imageworsener: memory allocation failure in my_mallocfn (imagew-cmd.c)