ELA-19-1 tiff3 security update

DoS vulnerabilities

Packagetiff3
Version3.9.6-11+deb7u12
Related CVE CVE-2017-11613 CVE-2018-5784

Two flaws were found in the tiff3 image library that may allow remote attackers to cause a denial of service (memory exhaustion or application crash) or possibly have unspecified other impact via a crafted image file.

CVE-2017-11613

In tiff3 there is a denial of service vulnerability in the TIFFOpen
function. A crafted input will lead to a denial of service attack. 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-2018-5784

A flaw was found in tiff3, there is an uncontrolled resource consumption in
the TIFFSetDirectory function of tif_dir.c. Remote attackers could leverage
this vulnerability to cause a denial of service via a crafted tif file.
This is possible because the declared number of directory entries is not
validated against the actual number of directory entries.

For Debian 7 Wheezy, these problems have been fixed in version 3.9.6-11+deb7u12.

We recommend that you upgrade your tiff3 packages.

Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/