漏洞描述

Western Digital My Cloud等都是美国西部数据（Western Digital）公司的一款个人存储设备。 多款Western Digital产品中存在身份验证绕过漏洞。攻击者可利用该漏洞修改My Cloud EX2 Ultra网页代码并以非管理员的My Cloud设备用户身份访问My Cloud。以下产品受到影响：Western Digital My Cloud；My Cloud Mirror Gen2；My Cloud EX2 Ultra；My Cloud EX2100；My Cloud EX4100；My Cloud DL2100；My Cloud DL4100；My Cloud PR2100；My Cloud PR4100。

Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR2100 and My Cloud PR4100 firmware before 2.31.174 is affected by an authentication bypass vulnerability. The login_mgr.cgi file checks credentials against /etc/shadow. However, the "nobody" account (which can be used to access the control panel API as a low-privilege logged-in user) has a default empty password, allowing an attacker to modify the My Cloud EX2 Ultra web page source code and obtain access to the My Cloud as a non-Admin My Cloud device user.