tiff: CVE-2018-16335: heap-buffer-overflow

Debian Bug report logs - #907795
tiff: CVE-2018-16335: heap-buffer-overflow

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

From: Salvatore Bonaccorso <carnil@debian.org>

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

Subject: tiff: CVE-2018-16335: heap-buffer-overflow

Date: Sun, 02 Sep 2018 10:56:24 +0200

Source: tiff
Version: 4.0.9-3
Severity: important
Tags: security upstream
Forwarded: http://bugzilla.maptools.org/show_bug.cgi?id=2809

Hi,

The following vulnerability was published for tiff.

CVE-2018-16335[0]:
| newoffsets handling in ChopUpSingleUncompressedStrip in tif_dirread.c
| in LibTIFF 4.0.9 allows remote attackers to cause a denial of service
| (heap-based buffer overflow and application crash) or possibly have
| unspecified other impact via a crafted TIFF file, as demonstrated by
| tiff2pdf. This is a different vulnerability than CVE-2018-15209.

Issue is demonstrable on a 32bit sid system:

valgrind tiff2pdf 2809.poc.tiff
==732== Memcheck, a memory error detector
==732== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==732== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==732== Command: tiff2pdf 2809.poc.tiff
==732==
TIFFReadDirectoryCheckOrder: Warning, Invalid TIFF directory; tags are not sorted in ascending order.
TIFFReadDirectory: Warning, Unknown field with tag 65046 (0xfe16) encountered.
TIFFFetchNormalTag: Warning, IO error during reading of "Software"; tag ignored.
TIFFReadDirectory: Warning, Bogus "StripByteCounts" field, ignoring and calculating from imagelength.
==732== Invalid write of size 4
==732==    at 0x485BEF2: ChopUpSingleUncompressedStrip (tif_dirread.c:5723)
==732==    by 0x485BEF2: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==  Address 0x4c92aa0 is 0 bytes after a block of size 0 alloc'd
==732==    at 0x483019B: malloc (vg_replace_malloc.c:298)
==732==    by 0x483245C: realloc (vg_replace_malloc.c:785)
==732==    by 0x488E7FB: _TIFFrealloc (tif_unix.c:336)
==732==    by 0x484EE57: _TIFFCheckRealloc (tif_aux.c:73)
==732==    by 0x484EEC5: _TIFFCheckMalloc (tif_aux.c:88)
==732==    by 0x485BE87: ChopUpSingleUncompressedStrip (tif_dirread.c:5701)
==732==    by 0x485BE87: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==
==732== Invalid write of size 4
==732==    at 0x485BEF5: ChopUpSingleUncompressedStrip (tif_dirread.c:5723)
==732==    by 0x485BEF5: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==  Address 0x4c92aa4 is 4 bytes after a block of size 0 alloc'd
==732==    at 0x483019B: malloc (vg_replace_malloc.c:298)
==732==    by 0x483245C: realloc (vg_replace_malloc.c:785)
==732==    by 0x488E7FB: _TIFFrealloc (tif_unix.c:336)
==732==    by 0x484EE57: _TIFFCheckRealloc (tif_aux.c:73)
==732==    by 0x484EEC5: _TIFFCheckMalloc (tif_aux.c:88)
==732==    by 0x485BE87: ChopUpSingleUncompressedStrip (tif_dirread.c:5701)
==732==    by 0x485BE87: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==
==732== Invalid write of size 4
==732==    at 0x485BF17: ChopUpSingleUncompressedStrip (tif_dirread.c:5724)
==732==    by 0x485BF17: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==  Address 0x4c92ad0 is 0 bytes after a block of size 0 alloc'd
==732==    at 0x483019B: malloc (vg_replace_malloc.c:298)
==732==    by 0x483245C: realloc (vg_replace_malloc.c:785)
==732==    by 0x488E7FB: _TIFFrealloc (tif_unix.c:336)
==732==    by 0x484EE57: _TIFFCheckRealloc (tif_aux.c:73)
==732==    by 0x484EEC5: _TIFFCheckMalloc (tif_aux.c:88)
==732==    by 0x485BEA7: ChopUpSingleUncompressedStrip (tif_dirread.c:5703)
==732==    by 0x485BEA7: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==
==732== Invalid write of size 4
==732==    at 0x485BF1B: ChopUpSingleUncompressedStrip (tif_dirread.c:5724)
==732==    by 0x485BF1B: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==  Address 0x4c92ad4 is 4 bytes after a block of size 0 alloc'd
==732==    at 0x483019B: malloc (vg_replace_malloc.c:298)
==732==    by 0x483245C: realloc (vg_replace_malloc.c:785)
==732==    by 0x488E7FB: _TIFFrealloc (tif_unix.c:336)
==732==    by 0x484EE57: _TIFFCheckRealloc (tif_aux.c:73)
==732==    by 0x484EEC5: _TIFFCheckMalloc (tif_aux.c:88)
==732==    by 0x485BEA7: ChopUpSingleUncompressedStrip (tif_dirread.c:5703)
==732==    by 0x485BEA7: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==
==732==
==732== Process terminating with default action of signal 11 (SIGSEGV)
==732==  Access not within mapped region at address 0x5091000
==732==    at 0x485BF17: ChopUpSingleUncompressedStrip (tif_dirread.c:5724)
==732==    by 0x485BF17: TIFFReadDirectory (tif_dirread.c:4186)
==732==    by 0x4880257: TIFFClientOpen (tif_open.c:466)
==732==    by 0x488E632: TIFFFdOpen (tif_unix.c:211)
==732==    by 0x488E71D: TIFFOpen (tif_unix.c:250)
==732==    by 0x10965E: main (tiff2pdf.c:753)
==732==  If you believe this happened as a result of a stack
==732==  overflow in your program's main thread (unlikely but
==732==  possible), you can try to increase the size of the
==732==  main thread stack using the --main-stacksize= flag.
==732==  The main thread stack size used in this run was 8388608.
==732==
==732== HEAP SUMMARY:
==732==     in use at exit: 4,482 bytes in 13 blocks
==732==   total heap usage: 24 allocs, 11 frees, 5,663 bytes allocated
==732==
==732== LEAK SUMMARY:
==732==    definitely lost: 0 bytes in 0 blocks
==732==    indirectly lost: 0 bytes in 0 blocks
==732==      possibly lost: 0 bytes in 0 blocks
==732==    still reachable: 4,482 bytes in 13 blocks
==732==         suppressed: 0 bytes in 0 blocks
==732== Rerun with --leak-check=full to see details of leaked memory
==732==
==732== For counts of detected and suppressed errors, rerun with: -v
==732== ERROR SUMMARY: 2093723 errors from 4 contexts (suppressed: 0 from 0)
Segmentation fault

The issue is not triggerable anymore with the poc in 4.0.9-6, but I'm unsure if
the CVE-2017-11613 / #869823 fix in 4.0.9-5 is just uncovering the issue. Thus
still filling a bug.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-16335
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16335

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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