Arch Linux Security Advisory ASA-201811-17
==========================================

Severity: High
Date    : 2018-11-20
CVE-ID  : CVE-2017-9935 CVE-2017-11613 CVE-2018-18557 CVE-2018-18661
Package : libtiff
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-790

Summary
=======

The package libtiff before version 4.0.10-1 is vulnerable to multiple
issues including arbitrary code execution and denial of service.

Resolution
==========

Upgrade to 4.0.10-1.

# pacman -Syu "libtiff>=4.0.10-1"

The problems have been fixed upstream in version 4.0.10.

Workaround
==========

None.

Description
===========

- CVE-2017-9935 (arbitrary code execution)

In LibTIFF before 4.0.10, there is a heap-based buffer overflow in the
t2p_write_pdf function in tools/tiff2pdf.c. This heap overflow could
lead to different damages. For example, a crafted TIFF document can
lead to an out-of-bounds read in TIFFCleanup, an invalid free in
TIFFClose or t2p_free, memory corruption in t2p_readwrite_pdf_image, or
a double free in t2p_free. Given these possibilities, it probably could
cause arbitrary code execution.

- CVE-2017-11613 (denial of service)

In LibTIFF before 4.0.10, there is a denial of service vulnerability in
the TIFFOpen function triggered by resource consumption via crafted
input files. During the TIFFOpen process, td_imagelength is not
checked. The value of td_imagelength can be directly controlled by an
input file. In the ChopUpSingleUncompressedStrip function, the
_TIFFCheckMalloc function is called based on td_imagelength. If we set
the value of td_imagelength close to the amount of system memory, it
will hang the system or trigger the OOM killer.

- CVE-2018-18557 (arbitrary code execution)

LibTIFF before 4.0.10 (with JBIG enabled) decodes arbitrarily-sized
JBIG into a buffer, ignoring the buffer size, which leads to a
tif_jbig.c JBIGDecode out-of-bounds write.

- CVE-2018-18661 (denial of service)

A null-pointer dereference has been found in LibTIFF before 4.0.10 in
the LZWDecode() function in the file tif_lzw.c.

Impact
======

A remote attacker might be able to cause a denial of service or execute
arbitrary code on the affected host via a crafted picture file.

References
==========

https://bugs.archlinux.org/task/60599
http://bugzilla.maptools.org/show_bug.cgi?id=2704
https://gitlab.com/libtiff/libtiff/commit/5848777bd7e4f465681a7c4d0acf96a1dbd5b75c
http://bugzilla.maptools.org/show_bug.cgi?id=2724
https://gitlab.com/libtiff/libtiff/commit/3719385a3fac5cfb20b487619a5f08abbf967cf8
https://gitlab.com/libtiff/libtiff/commit/7a092f8af2568d61993a8cc2e7a35a998d7d37be
https://bugs.chromium.org/p/project-zero/issues/detail?id=1697
https://gitlab.com/libtiff/libtiff/merge_requests/38
https://gitlab.com/libtiff/libtiff/commit/681748ec2f5ce88da5f9fa6831e1653e46af8a66
http://bugzilla.maptools.org/show_bug.cgi?id=2819
https://gitlab.com/libtiff/libtiff/commit/99b10edde9a0fc28cc0e7b7757aa18ac4c8c225f
https://security.archlinux.org/CVE-2017-9935
https://security.archlinux.org/CVE-2017-11613
https://security.archlinux.org/CVE-2018-18557
https://security.archlinux.org/CVE-2018-18661