CVE:CVE-2013-7439
CNNVD:CNNVD-201504-282
X11R6.x和libX11都是X.Org基金会运作的X11（X Window系统）客户端库。
X11R6.x和libX11 1.6.0之前版本的include/X11/Xlibint.h文件中的MakeBigReq和SetReqLen宏调用中存在差一错误漏洞。远程攻击者可通过发送特制的请求利用该漏洞造成拒绝服务，或执行任意代码。
solution:Upgrade x.org libx11 to a higher version than 1.0.1,1.0.2,1.0.3,1.1,1.1:rc1,1.1:rc2,1.1.4,1.1.5,1.1.6,1.1.99.1,1.1.99.2,1.2,1.2.1,1.2.2,1.3,1.3.1,1.3.2,1.3.3,1.3.4,1.3.5,1.3.6,1.3.99.901,1.3.99.902,1.3.99.903,1.4.0,1.4.1,1.4.2,1.4.3,1.4.4,1.4.99.901,1.4.99.902,1.5.0,1.5.99.901,1.5.99.902,and avoid the version 1.0.1,1.0.2,1.0.3,1.1,1.1:rc1,1.1:rc2,1.1.4,1.1.5,1.1.6,1.1.99.1,1.1.99.2,1.2,1.2.1,1.2.2,1.3,1.3.1,1.3.2,1.3.3,1.3.4,1.3.5,1.3.6,1.3.99.901,1.3.99.902,1.3.99.903,1.4.0,1.4.1,1.4.2,1.4.3,1.4.4,1.4.99.901,1.4.99.902,1.5.0,1.5.99.901,1.5.99.902; Upgrade canonical ubuntu_linux to a higher version than 12.04,14.04,14.10,and avoid the version 12.04,14.04,14.10; Upgrade debian debian_linux to a higher version than 7.0,and avoid the version 7.0; Upgrade x.org x11 to a higher version than 6.0,6.1,6.3,6.4,6.5.1,6.6,6.7,6.8.0,6.8.1,6.8.2,6.9,and avoid the version 6.0,6.1,6.3,6.4,6.5.1,6.6,6.7,6.8.0,6.8.1,6.8.2,6.9