CVE:CVE-2013-7177
CNNVD:CNNVD-201402-004
Fail2ban是软件开发者Cyril Jaquier所研发的一套基于Python的IP自动屏蔽工具。该工具可对系统日志进行监视，发现异常IP信息自动调用防火墙进行屏蔽，并发送E-mail通知系统管理员。
Fail2ban 0.8.10及之前的版本中的cyrus-imap过滤器中的config/filter.d/cyrus-imap.conf文件中存在输入验证漏洞。远程攻击者可借助特制的电子邮件地址利用该漏洞造成任意IP地址被阻挡。
solution:Upgrade fail2ban fail2ban to a higher version than 0.8.10,0.1.0,0.1.1,0.1.2,0.3.0,0.3.1,0.4.0,0.4.1,0.5.0,0.5.1,0.5.2,0.5.3,0.5.4,0.5.5,0.6.0,0.6.1,0.7.0,0.7.1,0.7.2,0.7.3,0.7.4,0.7.5,0.7.6,0.7.7,0.7.8,0.7.9,0.8.0,0.8.1,0.8.2,0.8.3,0.8.4,0.8.5,0.8.6,0.8.7,0.8.7.1,0.8.8,0.8.9,and avoid the version (,0.8.10],0.1.0,0.1.1,0.1.2,0.3.0,0.3.1,0.4.0,0.4.1,0.5.0,0.5.1,0.5.2,0.5.3,0.5.4,0.5.5,0.6.0,0.6.1,0.7.0,0.7.1,0.7.2,0.7.3,0.7.4,0.7.5,0.7.6,0.7.7,0.7.8,0.7.9,0.8.0,0.8.1,0.8.2,0.8.3,0.8.4,0.8.5,0.8.6,0.8.7,0.8.7.1,0.8.8,0.8.9