Denial of service vulnerabilities in PHP

Description

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.

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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.

Original advisories

• PHP 5 ChangeLog

• PHP 7 ChangeLog

Related products

• PHP

CVE list

• CVE-2016-8670
  critical
• CVE-2016-9934
  warning
• CVE-2016-9933
  warning

Read more

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