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风讯4的防注射函数NoSqlHack存在致命缺陷，导致入侵者可以轻松得到webshell
Function.asp
Function NoSqlHack(FS_inputStr)
Dim f_NoSqlHack_AllStr,f_NoSqlHack_Str,f_NoSqlHack_i,Str_InputStr
Str_InputStr=FS_inputStr
f_NoSqlHack_AllStr="*|and |exec |or |insert |select |delete |update |count |master |truncate |declare |and |exec |insert |select |delete |update |count |master |truncate |declare |char(|mid(|chr(|and[|exec[|insert[|select[|delete[|update[|count[|master[|truncate[|declare[|set[|set |set |where[|where |where |xp_cmdshell|xp_cmdshell |xp_cmdshell "
f_NoSqlHack_Str = Split(f_NoSqlHack_AllStr,"|")
For f_NoSqlHack_i=LBound(f_NoSqlHack_Str) To Ubound(f_NoSqlHack_Str)
If Instr(LCase(Str_InputStr),f_NoSqlHack_Str(f_NoSqlHack_i))<>0 Then
If f_NoSqlHack_Str(f_NoSqlHack_i)="'" Then f_NoSqlHack_Str(f_NoSqlHack_i)=" \' "
Response.Write "<html><title>??</title><body bgcolor=""EEEEEE"" leftmargin=""60"" topmargin=""30""><font style=""font-size:16px;font-weight:bolder;color:blue;""><li>???????????</li></font><font style=""font-size:14px;font-weight:bolder;color:red;""><br><li>?????????!</li><br><li>??IP:"&Request.ServerVariables("Remote_Addr")&"</li><br><li>????:"&Now&"</li></font></body></html><!--Powered by Foosun Inc.,AddTime:"&now&"-->"
Response.End
End if
Next
NoSqlHack = Replace(Str_InputStr,"'","''")
End Function
关键字后面跟空格和tab是过滤的,但是跟回车时一样可以执行注射语句.过滤单引号也没有用的，我插入时用16进制编码,所以每一个点都是有问题的注射点 |
