optipng: CVE-2017-16938: global-buffer-overflow bug while parsing GIF file

Debian Bug report logs - #878839
optipng: CVE-2017-16938: global-buffer-overflow bug while parsing GIF file

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Joonun Jang <joonun.jang@gmail.com>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: optipng: global-buffer-overflow bug while parsing GIF file

Date: Tue, 17 Oct 2017 13:10:15 +0900

[Message part 1 (text/plain, inline)]

Package: optipng
Version: 0.7.6-1
Severity: normal

Dear Maintainer,

global-buffer-overflow bug while parsing GIF file

Running 'optipng' with the attached file raises global-buffer-overflow
bug,
which may allow a remote attacker to cause a denial-of-service attack or
other unspecified impact with a crafted file.

I expected the program to terminate without segfault, but the program
crashes as follow

************************************************************************
* Please consider that this bug isn't found in default debian optipng  *
* which is installed by apt-get.                                       *
* This bug is only triggered when optipng was compiled by clang or by  *
* gcc without any optimizations.                                       * 
************************************************************************
-----------------------------

<logs with address sanitizer>

june@june:~/project/analyze/poc/optipng$ optipng poc
** Processing: poc
Warning: Bogus data in GIF
=================================================================
==11381==ERROR: AddressSanitizer: global-buffer-overflow on address
0x55c9084bf040 at pc 0x55c908286630 bp 0x7fffd3831e40 sp 0x7fffd3831e38
WRITE of size 4 at 0x55c9084bf040 thread T0
=================================================================
==11381==ERROR: AddressSanitizer: global-buffer-overflow on address
0x55c9084bf040 at pc 0x55c908286630 bp 0x7fffd3831e40 sp 0x7fffd3831e38
WRITE of size 4 at 0x55c9084bf040 thread T0
#0 0x55c90828662f
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x7362f)
#1 0x55c908285912
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x72912)
#2 0x55c90828549f
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x7249f)
#3 0x55c908284e00
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x71e00)
#4 0x55c908239928
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x26928)
#5 0x55c9082367a7
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x237a7)
#6 0x55c908229674
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x16674)
#7 0x55c90822b778
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x18778)
#8 0x55c90822c9fe
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x199fe)
#9 0x55c90822731e
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x1431e)
#10 0x55c908227436
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x14436)
#11 0x7fb1b02de2b0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b0)
#12 0x55c908224389
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x11389)

0x55c9084bf040 is located 0 bytes to the right of global variable
'stack' defined in 'gifread.c:401:16' (0x55c9084b7040) of size 32768
0x55c9084bf040 is located 32 bytes to the left of global variable
'oldcode' defined in 'gifread.c:398:27' (0x55c9084bf060) of size 4
SUMMARY: AddressSanitizer: global-buffer-overflow
(/home/june/project/analyze/bins/optipng-0.7.6/src/optipng/optipng+0x7362f) 
Shadow bytes around the buggy address:
  0x0ab9a108fdb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fdc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fdd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fde0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fdf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ab9a108fe00: 00 00 00 00 00 00 00 00[f9]f9 f9 f9 04 f9 f9 f9
  0x0ab9a108fe10: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
  0x0ab9a108fe20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fe30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fe40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ab9a108fe50: 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
Heap right redzone:      fb
Freed heap region:       fd
Stack left redzone:      f1
Stack mid redzone:       f2
Stack right redzone:     f3
Stack partial redzone:   f4
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
==11381==ABORTING

<stack trace>
(gdb) r poc
Starting program: /usr/bin/optipng poc
** Processing: poc
Warning: Bogus data in GIF

Program received signal SIGSEGV, Segmentation fault.
0x000055555557d075 in LZWReadByte (init_flag=0, input_code_size=2,
stream=0x55555579e010)
    at gifread.c:499
    499             *sp++ = table[1][code];
(gdb) bt
#0  0x000055555557d075 in LZWReadByte (init_flag=0, input_code_size=2,
stream=0x55555579e010) at gifread.c:499
#1  0x000055555557ca05 in GIFReadImageData (image=0x7fffffffb310,
stream=0x55555579e010) at gifread.c:261
#2  0x000055555557c846 in GIFReadNextImage (image=0x7fffffffb310,
stream=0x55555579e010) at gifread.c:217
#3  0x000055555557c618 in GIFReadNextBlock (image=0x7fffffffb310,
ext=0x7fffffffb2f0, stream=0x55555579e010) at gifread.c:163
#4  0x0000555555561055 in pngx_read_gif (png_ptr=0x55555579e240,
info_ptr=0x55555579e4a0, stream=0x55555579e010) at pngxrgif.c:151
#5  0x000055555555f658 in pngx_read_image (png_ptr=0x55555579e240,
info_ptr=0x55555579e4a0, fmt_name_ptr=0x7fffffffbc30,
fmt_long_name_ptr=0x0) at pngxread.c:130
#6  0x0000555555558d3b in opng_read_file (infile=0x55555579e010) at
optim.c:939
#7  0x000055555555a106 in opng_optimize_impl (infile_name=0x7fffffffe487
"poc") at optim.c:1503
#8  0x000055555555b01b in opng_optimize (infile_name=0x7fffffffe487
"poc") at optim.c:1853
#9  0x0000555555557525 in process_files (argc=2, argv=0x7fffffffe178) at
optipng.c:941
#10 0x00005555555575da in main (argc=2, argv=0x7fffffffe178) at
optipng.c:975

This bug happened because below loop worked infinitely.

while (code >= clear_code)
{
  *sp++ = table[1][code];
  if (code == table[0][code])
    GIFError("GIF/LZW error: circular table entry");
  code = table[0][code];
}

(gdb) p table[0]
$3 = {0, 0, 0, 0, 0, 0, 3, 0, 0, 15, 9, 15, 8, 10, 1, 13, 0 <repeats
4080 times>}

code value is assigned 15 -> 13 -> 10 -> 9 -> 15 -> 13 -> 10 -> 9 -> ...
repetedely.
15, 13, 10, 9 are always bigger than clear_code so this loop runs
forever
and sp pointer will increase forever which causes buffer overflow.

-----------------------------

The bug was found with a fuzzer developed by 'SoftSec' group at KAIST.

-- System Information:
Debian Release: 9.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages optipng depends on:
ii  libc6        2.24-11+deb9u1
ii  libpng16-16  1.6.28-1
ii  zlib1g       1:1.2.8.dfsg-5

optipng recommends no packages.

optipng suggests no packages.

-- no debconf information

[poc (image/gif, attachment)]

Message #18 received at 878839@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: 878839@bugs.debian.org, 882032@bugs.debian.org

Subject: optipng: diff for NMU version 0.7.6-1.1

Date: Thu, 7 Dec 2017 21:27:45 +0100

[Message part 1 (text/plain, inline)]

Control: tags 878839 + patch
Control: tags 878839 + pending
Control: tags 882032 + pending

Dear maintainer,

I've prepared an NMU for optipng (versioned as 0.7.6-1.1) and
uploaded it to DELAYED/5. Please feel free to tell me if I
should delay it longer.

Regards,
Salvatore

[optipng-0.7.6-1.1-nmu.diff (text/x-diff, attachment)]

Message #27 received at 878839@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Emmanuel Bouthenot <kolter@openics.org>

Cc: 878839@bugs.debian.org, 882032@bugs.debian.org

Subject: optipng: moved to delayed/0

Date: Fri, 8 Dec 2017 17:16:56 +0100

Hi Emmanuel

I perfectly realize it's not conforming to the NMU rules, so if that
made you unhappy I apologies for it. I moved the optipng upload from
delayed/5 to delayed/0 since was planing a security update, and the
point release happening this weekend would imply stretch-version <
sid-version. So opted for moving the upload faster.

Regards,
Salvatore

Message #32 received at 878839-close@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: 878839-close@bugs.debian.org

Subject: Bug#878839: fixed in optipng 0.7.6-1.1

Date: Fri, 08 Dec 2017 16:49:16 +0000

Source: optipng
Source-Version: 0.7.6-1.1

We believe that the bug you reported is fixed in the latest version of
optipng, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 878839@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Salvatore Bonaccorso <carnil@debian.org> (supplier of updated optipng package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 07 Dec 2017 20:43:29 +0100
Source: optipng
Binary: optipng
Architecture: source
Version: 0.7.6-1.1
Distribution: unstable
Urgency: medium
Maintainer: Debian PhotoTools Maintainers <pkg-phototools-devel@lists.alioth.debian.org>
Changed-By: Salvatore Bonaccorso <carnil@debian.org>
Closes: 878839 882032
Description: 
 optipng    - advanced PNG (Portable Network Graphics) optimizer
Changes:
 optipng (0.7.6-1.1) unstable; urgency=medium
 .
   * Non-maintainer upload.
   * Prevent integer overflow in minitiff_read_info() (CVE-2017-1000229)
     (Closes: #882032)
   * gifread: Detect indirect circular dependencies in LZW tables
     (CVE-2017-16938) (Closes: #878839)
Checksums-Sha1: 
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 2a77c95caedb65768d82bbde91ae380acc3aaed3 5952 optipng_0.7.6-1.1.debian.tar.bz2
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Files: 
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Message #39 received at 878839-close@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: 878839-close@bugs.debian.org

Subject: Bug#878839: fixed in optipng 0.7.6-1+deb9u1

Date: Sat, 09 Dec 2017 12:03:01 +0000

Source: optipng
Source-Version: 0.7.6-1+deb9u1

We believe that the bug you reported is fixed in the latest version of
optipng, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 878839@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Salvatore Bonaccorso <carnil@debian.org> (supplier of updated optipng package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 07 Dec 2017 21:42:04 +0100
Source: optipng
Binary: optipng
Architecture: source
Version: 0.7.6-1+deb9u1
Distribution: stretch-security
Urgency: high
Maintainer: Debian PhotoTools Maintainers <pkg-phototools-devel@lists.alioth.debian.org>
Changed-By: Salvatore Bonaccorso <carnil@debian.org>
Closes: 878839 882032
Description: 
 optipng    - advanced PNG (Portable Network Graphics) optimizer
Changes:
 optipng (0.7.6-1+deb9u1) stretch-security; urgency=high
 .
   * Non-maintainer upload by the Security Team.
   * Prevent integer overflow in minitiff_read_info() (CVE-2017-1000229)
     (Closes: #882032)
   * gifread: Detect indirect circular dependencies in LZW tables
     (CVE-2017-16938) (Closes: #878839)
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Message #44 received at 878839-close@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: 878839-close@bugs.debian.org

Subject: Bug#878839: fixed in optipng 0.7.5-1+deb8u2

Date: Sat, 09 Dec 2017 14:38:32 +0000

Source: optipng
Source-Version: 0.7.5-1+deb8u2

We believe that the bug you reported is fixed in the latest version of
optipng, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 878839@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Salvatore Bonaccorso <carnil@debian.org> (supplier of updated optipng package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 07 Dec 2017 21:47:21 +0100
Source: optipng
Binary: optipng
Architecture: source
Version: 0.7.5-1+deb8u2
Distribution: jessie-security
Urgency: high
Maintainer: Debian PhotoTools Maintainers <pkg-phototools-devel@lists.alioth.debian.org>
Changed-By: Salvatore Bonaccorso <carnil@debian.org>
Closes: 878839 882032
Description: 
 optipng    - advanced PNG (Portable Network Graphics) optimizer
Changes:
 optipng (0.7.5-1+deb8u2) jessie-security; urgency=high
 .
   * Non-maintainer upload by the Security Team.
   * Prevent integer overflow in minitiff_read_info() (CVE-2017-1000229)
     (Closes: #882032)
   * gifread: Detect indirect circular dependencies in LZW tables
     (CVE-2017-16938) (Closes: #878839)
Checksums-Sha1: 
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 3b090bb10709b155af4d3a00f66030ef 6632 graphics optional optipng_0.7.5-1+deb8u2.debian.tar.bz2

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