PHP could be made to crash or run programs if it opened a specially crafted file.
It was discovered that PHP incorrectly handled exif tags in certain images. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code.
4 July 2018
A security issue affects these releases of Ubuntu and its derivatives:
PHP could be made to crash or run programs if it opened a specially crafted file.
It was discovered that PHP incorrectly handled exif tags in certain images. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
This update uses a new upstream release, which includes additional bug fixes. In general, a standard system update will make all the necessary changes.