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Date: Mon, 28 Aug 2017 14:39:23 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: openjpeg: stack-based buffer overflow write in pgxtoimage (convert.c)

Description:
openjpeg is an open-source JPEG 2000 library.

The complete ASan output of the issue:

# opj_compress -n 1 -i $FILE -o null.j2k
==159529==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fde59900160 at pc 0x000000450bef bp 0x7ffe7641f3c0 sp 0x7ffe7641eb70
WRITE of size 36 at 0x7fde59900160 thread T0
    #0 0x450bee in scanf_common /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/../sanitizer_common/sanitizer_common_interceptors_format.inc:343
    #1 0x451d20 in __interceptor___isoc99_vfscanf /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:1265
    #2 0x451e02 in __interceptor___isoc99_fscanf /var/tmp/portage/sys-libs/compiler-rt-sanitizers-4.0.1/work/compiler-rt-4.0.1.src/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:1282
    #3 0x525417 in pgxtoimage /var/tmp/portage/media-libs/openjpeg-9999/work/openjpeg-9999/src/bin/jp2/convert.c:1188:9
    #4 0x50b520 in main /var/tmp/portage/media-libs/openjpeg-9999/work/openjpeg-9999/src/bin/jp2/opj_compress.c:1831:21
    #5 0x7fde5d0c1680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
    #6 0x41bc18 in _start (/usr/bin/opj_compress+0x41bc18)

Address 0x7fde59900160 is located in stack of thread T0 at offset 352 in frame
    #0 0x52523f in pgxtoimage /var/tmp/portage/media-libs/openjpeg-9999/work/openjpeg-9999/src/bin/jp2/convert.c:1158

  This frame has 16 object(s):
    [32, 33) 'c1.i192'
    [48, 49) 'c2.i193'
    [64, 65) 'c3.i'
    [80, 81) 'c4.i'
    [96, 97) 'c1.i188'
    [112, 113) 'c2.i'
    [128, 129) 'c1.i183'
    [144, 145) 'c1.i'
    [160, 164) 'w'
    [176, 180) 'h'
    [192, 196) 'prec'
    [208, 244) 'cmptparm'
    [288, 289) 'endian1'
    [304, 305) 'endian2'
    [320, 352) 'signtmp'
    [384, 416) 'temp' 0x0ffc4b318020: f2 f2 f2 f2 01 f2 01 f2 00 00 00 00[f2]f2 f2 f2
  0x0ffc4b318030: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00
  0x0ffc4b318040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffc4b318050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffc4b318060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffc4b318070: 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
==159529==ABORTING
Aborted

Affected version:
2.2.0

Fixed version:
N/A

Commit fix:
https://github.com/uclouvain/openjpeg/commit/e5285319229a5d77bf316bb0d3a6cbd3cb8666d9

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
Waiting for a CVE assignment

Reproducer:
https://github.com/asarubbo/poc/blob/master/00327-openjpeg-stackoverflow-pgxtoimage

Timeline:
2017-08-18: bug discovered and reported to upstream
2017-08-18: upstream released a patch
2017-08-28: blog post about the issue

Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported by the Core Infrastructure Initiative.

Permalink:
https://blogs.gentoo.org/ago/2017/08/28/openjpeg-stack-based-buffer-overflow-write-in-pgxtoimage-convert-c/

--
Agostino Sarubbo
Gentoo Linux Developer


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