受影响的系统：

　　XFree86 X11R6

　　详细描述：

　　XFree86是一款流行的X服务器。

　　XFree86包含的dexconf工具不正确设置目录权限，本地攻击者可以利用这个漏洞删除或者修改目录中搜集的数据。

　　dexconf工具在设置/dev/dri目录时以666权限建立，因此任意攻击者可以修改和删除此目录下的文件和数据，或者使用恶意程序代替正常文件，可能导致权限提升。

　　解决方法：

　　目前RedHat已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：

RedHat XFree86-100dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-100dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-4.2.1-20.i386.rpm

RedHat XFree86-75dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-75dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-15-100dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-15-100dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-15-75dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-15-75dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-2-100dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-2-100dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-2-75dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-2-75dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-9-100dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-9-100dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-ISO8859-9-75dpi-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-ISO8859-9-75dpi-fonts-4.2.1-20.i386.rpm

RedHat XFree86-Mesa-libGL-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-Mesa-libGL-4.2.1-20.i386.rpm

RedHat XFree86-Mesa-libGLU-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-Mesa-libGLU-4.2.1-20.i386.rpm

RedHat XFree86-Xnest-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-Xnest-4.2.1-20.i386.rpm

RedHat XFree86-Xvfb-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-Xvfb-4.2.1-20.i386.rpm

RedHat XFree86-base-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-base-fonts-4.2.1-20.i386.rpm

RedHat XFree86-cyrillic-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-cyrillic-fonts-4.2.1-20.i386.rpm

RedHat XFree86-devel-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-devel-4.2.1-20.i386.rpm

RedHat XFree86-doc-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-doc-4.2.1-20.i386.rpm

RedHat XFree86-font-utils-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-font-utils-4.2.1-20.i386.rpm

RedHat XFree86-libs-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-libs-4.2.1-20.i386.rpm

RedHat XFree86-tools-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-tools-4.2.1-20.i386.rpm

RedHat XFree86-truetype-fonts-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-truetype-fonts-4.2.1-20.i386.rpm

RedHat XFree86-twm-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-twm-4.2.1-20.i386.rpm

RedHat XFree86-xauth-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-xauth-4.2.1-20.i386.rpm

RedHat XFree86-xdm-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-xdm-4.2.1-20.i386.rpm

RedHat XFree86-xfs-4.2.0-72.i386.rpm :
RedHat Upgrade XFree86-xfs-4.2.1-20.i386.rpm