Vulnerability Information
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Vulnerability Title
N/A
Vulnerability Description
OpenBSD and NetBSD permit usermode code to kill the display server and write to the X.Org /dev/xf86 device, which allows local users with root privileges to reduce securelevel by replacing the System Management Mode (SMM) handler via a write to an SMRAM address within /dev/xf86 (aka the video card memory-mapped I/O range), and then launching the new handler via a System Management Interrupt (SMI), as demonstrated by a write to Programmed I/O port 0xB2.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
OpenBSD和NetBSD '/dev/xf86' root权限的本地用户安全权限漏洞
Vulnerability Description
OpenBSD和NetBSD允许用户模式代码终止显示服务器并写到X.Org /dev/xf86设备，具有root权限的本地用户可以通过先写到一个/dev/xf86(视频卡内存映射I/O范围)中的地址，然后借助系统管理中断(SMI)来启动新的处理程序，从而替换系统管理模式处理程序来降低安全级别。如通过写到Programmed I/O端口0xB2。
CVSS Information
N/A
Vulnerability Type
N/A