CVE:CVE-2011-4120
CNNVD:CNNVD-201111-168
Yubico PAM Module 2.10之前版本中存在安全漏洞。远程攻击者可利用该漏洞利用NULL密码绕过身份验证过程，并获得对系统的未授权访问权限。
solution:Upgrade yubico pam_module to a higher version than 2.10,and avoid the version (,2.10); Upgrade debian debian_linux to a higher version than 8.0,9.0,10.0,and avoid the version 8.0,9.0,10.0