CVE:CVE-2020-27818
CNNVD:CNNVD-202012-444
Libpng Pngcheck是Libpng组织的一个用C编写的基于检查内部32位CRC、aka校验和并解压缩图像数据的验证PNG，JNG和MNG文件完整性的软件。
pngcheck-2.4.0 存在安全漏洞，该漏洞源于check_chunk_name()函数发现了一个缺陷。攻击者可利用该漏洞可以传递一个恶意文件，由pngcheck处理，可以导致暂时拒绝服务，对应用程序可用性构成低风险。
solution:Upgrade libpng pngcheck to a higher version than 2.4.0,and avoid the version 2.4.0; Upgrade fedoraproject extra_packages_for_enterprise_linux to a higher version than 7.0,8.0,and avoid the version 7.0,8.0; Upgrade fedoraproject fedora to a higher version than 31,32,33,34,and avoid the version 31,32,33,34; Upgrade debian debian_linux to a higher version than 9.0,and avoid the version 9.0