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cve-2022-42889-intercept's Introduction

cve-2022-42889-intercept

  • 低于 Java11版本的需要注意，更高的版本已经取消了Javascript解释器
  • 本次方案针对 Java8

通过 jvm 启动参数 以及 jps pid进行拦截非法参数

rce_demo.png

quick start

-----------------------load......
cve-2022-42889 check start
cve-2022-42889 is_deep_match  org.apache.commons.text.StringSubstitutor
md.getReturnType().getActualName() java.lang.String
[cve-2022-42899] class found!: class org.apache.commons.text.StringSubstitutor
(StringSubstitutor replace disabled)
[CVE 2022-42889] StringSubstitutorclass org.apache.commons.text.StringSubstitutor: (sanitized) PoC Output: %_script:javascript:195 + 324_
by arksec.cn

打开方式

使用 Attach API 远程加载的 Java agent 不会再先于main方法执行，这取决于另一虚拟机调用 Attach API 的时机。并且，它运行的也不再是premain方法，而是名为agentmain的方法。 Java 虚拟机并不限制 Java agent 的数量。你可以在 java 命令后附上多个-javaagent参数，或者远程 attach 多个 Java agent，Java 虚拟机会按照定义顺序，或者 attach 的顺序逐个执行这些 Java agent。

  • premain
  • java 启动参数
-javaagent:/path/to/dir/CVE-2022-42889-Agent-1.0-SNAPSHOT-jar-with-dependencies.jar
  • agentmain
  • jps （pid注入）
  • 执行 Attach 的main方法 (先引入 tools.jar)

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