Multiple serious vulnerabilities have been found in PHP before 5.6.28 and PHP 7.x before 7.0.13. Malicious users can exploit these vulnerabilities to cause a denial of service. Other unspecified impacts are also possible.

Below is a complete list of vulnerabilities:

1. NULL pointer dereference in ext/wddx/wddx.c can be exploited remotely via specially designed data in a wddxPacket XML document to cause a denial of service;
2. Stack consumption vulnerability in the GD Graphics Library (libgd) can be exploited remotely via specially designed imagefilltoborder call which forces usage of a negative color value to cause a denial of service;
3. Integer signedness error in the GD Graphics Library (libgd) can be exploited remotely via specially designed imagecreatefromstring call to cause a denial of service.

Technical details

Vulnerability (2) occurs in the gdImageFillToBorder function in gd.c file from the GD Graphics Library.

Vulnerability (3) occurs in the dynamicGetbuf function in gd_io_dp.c from the GD Graphics Library.

PHP before 5.6.28
PHP 7.x before 7.0.13

Update to the latest versions
Download PHP

PHP 5 ChangeLog
PHP 7 ChangeLog