GD Graphics Library (LibGD) is an open source code library for the dynamic creation of images by programmers.
LibGD 2.1.1 has an integer signature error. By constructing compressed gd2 data, remote attackers can start a denial of service attack or run arbitrary code.
LibGD 2.1.1 or earlier versions
Use the official patch to re-compile and install LibGD.
Upgrade the PHP version.
- Upgrade the 7.0.x series to 7.0.6 or later.
- Upgrade the 5.6.x series to 5.6.21 or later.
- Upgrade the 5.5.x series to 5.5.35 or later.