CVE:CVE-2019-12523
CNNVD:CNNVD-201911-497
Squid是一套代理服务器和Web缓存服务器软件。该软件提供缓存万维网、过滤流量、代理上网等功能。URI processor是其中的一个URI（统一资源标识符）处理器。
Squid 4.9之前版本中的URI processor存在输入验证错误漏洞，该漏洞源于程序没有正确处理URN请求。攻击者可借助特制请求利用该漏洞访问受限制的HTTP服务器。
solution:Upgrade squid-cache squid to a higher version than 3.5.28,4.8,and avoid the version [3.0,3.5.28],[4.0,4.8]; Upgrade canonical ubuntu_linux to a higher version than 16.04,18.04,19.04,19.10,and avoid the version 16.04,18.04,19.04,19.10; Upgrade fedoraproject fedora to a higher version than 30,31,and avoid the version 30,31; Upgrade opensuse leap to a higher version than 15.0,and avoid the version 15.0; Upgrade debian debian_linux to a higher version than 9.0,10.0,and avoid the version 9.0,10.0