CVE:CVE-2017-6362
CNNVD:CNNVD-201702-939
libgd2（又名GD Graphics Library或libgd）是美国软件开发者Thomas Boutell所研发的一个开源的用于动态创建图像的库，它支持创建图表、图形和缩略图等。
libgd2 2.2.5之前的版本中的‘gdImagePngPtr’函数存在双重释放漏洞。远程攻击者可利用该漏洞造成拒绝服务。
solution:Upgrade libgd libgd to a higher version than 2.2.4,and avoid the version 2.2.4; Upgrade debian debian_linux to a higher version than 8.0,9.0,and avoid the version 8.0,9.0; Upgrade fedoraproject fedora to a higher version than 26,and avoid the version 26; Upgrade canonical ubuntu_linux to a higher version than 16.04,and avoid the version 16.04