{"id":79413,"date":"2026-03-02T06:09:28","date_gmt":"2026-03-01T22:09:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79413.html"},"modified":"2026-03-02T06:09:28","modified_gmt":"2026-03-01T22:09:28","slug":"%e4%bb%8e%e9%9b%b6%e6%9e%84%e5%bb%ba%e4%b8%89%e5%b1%82%e7%bd%91%e7%bb%9c%e6%94%bb%e9%98%b2%e5%ae%9e%e9%aa%8c%e7%8e%af%e5%a2%83%ef%bc%88%e5%90%abnat%e3%80%81%e9%98%b2%e7%81%ab%e5%a2%99%e3%80%81ssti","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79413.html","title":{"rendered":"\u4ece\u96f6\u6784\u5efa\u4e09\u5c42\u7f51\u7edc\u653b\u9632\u5b9e\u9a8c\u73af\u5883\uff08\u542bNAT\u3001\u9632\u706b\u5899\u3001SSTI\u5b8c\u6574\u5b9e\u6218\uff09"},"content":{"rendered":"<h2>\u4ece\u96f6\u6784\u5efa\u4e09\u5c42\u7f51\u7edc\u653b\u9632\u5b9e\u9a8c\u73af\u5883<\/h2>\n<h3>\u5199\u5728\u524d\u9762<\/h3>\n<p>\u5728\u771f\u5b9e\u4f01\u4e1a\u73af\u5883\u4e2d&#xff0c;\u653b\u51fb\u8005\u5f80\u5f80\u4e0d\u53ef\u80fd\u76f4\u63a5\u8fdb\u5165\u6838\u5fc3\u5185\u7f51&#xff0c;\u800c\u662f\u9700\u8981\u7ecf\u8fc7\u591a\u4e2a\u7f51\u7edc\u5206\u5c42&#xff0c;\u9010\u6b65\u7a81\u7834\u9694\u79bb\u673a\u5236&#xff0c;\u6700\u7ec8\u5b9e\u73b0\u6a2a\u5411\u79fb\u52a8\u4e0e\u6743\u9650\u63d0\u5347\u3002<\/p>\n<p>\u4e3a\u4e86\u66f4\u6df1\u5165\u7406\u89e3\u8fd9\u4e00\u8fc7\u7a0b&#xff0c;\u6211\u642d\u5efa\u4e86\u4e00\u4e2a\u5b8c\u6574\u7684\u4e09\u5c42\u7f51\u7edc\u653b\u9632\u5b9e\u9a8c\u73af\u5883&#xff0c;\u6a21\u62df\u5982\u4e0b\u653b\u51fb\u8def\u5f84&#xff1a;<\/p>\n<p>\u5916\u7f51\u653b\u51fb\u8005 \u2192 \u8df3\u677f\u673a\u7a81\u7834 \u2192 \u5185\u7f51\u6e17\u900f \u2192 \u83b7\u53d6Flag<\/p>\n<p>\u672c\u6587\u5c06\u5b8c\u6574\u8bb0\u5f55\u8be5\u5b9e\u9a8c\u73af\u5883\u7684\u8bbe\u8ba1\u601d\u8def\u3001\u7f51\u7edc\u9694\u79bb\u5b9e\u73b0\u65b9\u5f0f\u4ee5\u53ca\u6f0f\u6d1e\u5229\u7528\u8fc7\u7a0b\u3002<\/p>\n<h4>\u6ce8\u610f<\/h4>\n<p>&#x1f4cc; \u5b8c\u6574\u9879\u76ee\u5df2\u6574\u7406\u5230 GitHub&#xff0c;\u5305\u542b&#xff1a;<\/p>\n<ul>\n<li>\u865a\u62df\u673a\u955c\u50cf<\/li>\n<li>\u7f51\u7edc\u914d\u7f6e\u6587\u6863<\/li>\n<li>\u6f0f\u6d1e\u6e90\u7801<\/li>\n<li>\u653b\u51fb\u94fe\u6d41\u7a0b\u8bf4\u660e<\/li>\n<\/ul>\n<p>\u9879\u76ee\u5730\u5740&#xff1a; &#x1f449; https:\/\/github.com\/see286\/Three-Tier-Network-Attack-Lab<\/p>\n<p>\u6b22\u8fce\u5927\u5bb6\u8bbf\u95ee\u3001\u4ea4\u6d41\u548c\u6539\u8fdb&#xff01;<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u6574\u4f53\u67b6\u6784\u8bbe\u8ba1\u601d\u8def<\/h3>\n<p>\u672c\u5b9e\u9a8c\u91c7\u7528\u4e09\u865a\u62df\u673a\u7ed3\u6784&#xff1a;<\/p>\n<ul>\n<li>\u653b\u51fb\u673a&#xff08;Kali&#xff09;\u2014\u2014 \u5916\u7f51\u6a21\u62df\u653b\u51fb\u8005<\/li>\n<li>\u4ee3\u7406\u673a&#xff08;Kali&#xff09;\u2014\u2014 \u8df3\u677f\u673a \/ NAT\u7f51\u5173<\/li>\n<li>\u5185\u7f51\u673a&#xff08;Kali&#xff09;\u2014\u2014 \u76ee\u6807\u9776\u673a<\/li>\n<\/ul>\n<p>\u7f51\u7edc\u7ed3\u6784\u5982\u4e0b&#xff1a;<\/p>\n<p>Attacker (192.168.36.x)<br \/>\n        |<br \/>\n        |<br \/>\nProxy (192.168.2.10)<br \/>\n        |<br \/>\n        |<br \/>\nInternal (192.168.3.10)<\/p>\n<p>\u8bbe\u8ba1\u76ee\u6807&#xff1a;<\/p>\n<li>\u653b\u51fb\u673a\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5185\u7f51<\/li>\n<li>\u5185\u7f51\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5916\u7f51<\/li>\n<li>\u4ee3\u7406\u673a\u4f5c\u4e3a\u552f\u4e00\u4e2d\u95f4\u8282\u70b9<\/li>\n<li>\u6240\u6709\u8de8\u7f51\u6bb5\u6d41\u91cf\u5fc5\u987b\u7ecf\u8fc7\u4ee3\u7406\u673a<\/li>\n<li>\u4ee3\u7406\u673a\u627f\u62c5 NAT &#043; \u9632\u706b\u5899\u529f\u80fd<\/li>\n<p>\u8fd9\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u7b80\u5316\u7248\u4f01\u4e1a DMZ &#043; \u5185\u7f51\u7ed3\u6784\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u7f51\u7edc\u9694\u79bb\u4e0e\u8def\u7531\u8bbe\u8ba1<\/h3>\n<p>\u672c\u5b9e\u9a8c\u7684\u6838\u5fc3\u96be\u70b9\u4e0d\u5728\u6f0f\u6d1e&#xff0c;\u800c\u5728\u7f51\u7edc\u9694\u79bb\u3002<\/p>\n<h4>(1) \u9759\u6001 IP \u89c4\u5212<\/h4>\n<ul>\n<li>\u4ee3\u7406\u673a&#xff1a;192.168.2.10 &#043; 192.168.3.2<\/li>\n<li>\u5185\u7f51\u673a&#xff1a;192.168.3.10<\/li>\n<li>\u653b\u51fb\u673a&#xff1a;NAT \u7f51\u7edc&#xff08;192.168.36.x&#xff09;<\/li>\n<\/ul>\n<p>\u4f7f\u7528 nmcli \u8fdb\u884c\u9759\u6001IP\u6301\u4e45\u5316\u914d\u7f6e\u3002<\/p>\n<hr \/>\n<h4>(2) IP \u8f6c\u53d1\u5f00\u542f<\/h4>\n<p>Linux \u9ed8\u8ba4\u4e0d\u80fd\u8f6c\u53d1\u6570\u636e\u5305&#xff0c;\u56e0\u6b64\u9700\u8981\u5728\u4ee3\u7406\u673a\u5f00\u542f&#xff1a;<\/p>\n<p>sudo sysctl -w net.ipv4.ip_forward&#061;1<\/p>\n<p>\u5e76\u5199\u5165 \/etc\/sysctl.conf \u5b9e\u73b0\u6301\u4e45\u5316\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u542f\u7528 IP \u8f6c\u53d1&#xff0c;\u8de8\u7f51\u6bb5\u901a\u4fe1\u65e0\u6cd5\u5b9e\u73b0\u3002<\/p>\n<hr \/>\n<h4>(3) NAT \u8bbe\u8ba1&#xff08;SNAT&#xff09;<\/h4>\n<p>\u4e3a\u4e86\u8ba9\u5185\u7f51\u901a\u8fc7\u4ee3\u7406\u8bbf\u95ee\u5916\u7f51&#xff0c;\u9700\u8981\u5728\u4ee3\u7406\u673a\u5f00\u542f NAT&#xff1a;<\/p>\n<p>sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE<\/p>\n<p>\u8fd9\u91cc\u4f7f\u7528\u7684\u662f SNAT\u3002<\/p>\n<p>\u6838\u5fc3\u4f5c\u7528&#xff1a;<\/p>\n<ul>\n<li>\u5185\u7f51\u6e90\u5730\u5740\u66ff\u6362\u4e3a\u4ee3\u7406\u673a\u5916\u7f51IP<\/li>\n<li>\u5185\u7f51\u53ef\u8bbf\u95ee\u4e92\u8054\u7f51<\/li>\n<li>\u5916\u90e8\u4e0d\u80fd\u76f4\u63a5\u8bbf\u95ee\u5185\u7f51<\/li>\n<\/ul>\n<hr \/>\n<h4>(4) iptables \u9632\u706b\u5899\u9694\u79bb<\/h4>\n<p>\u8fd9\u662f\u6574\u4e2a\u5b9e\u9a8c\u7684\u5173\u952e\u3002<\/p>\n<p>\u6211\u91c7\u7528\u9ed8\u8ba4\u62d2\u7edd\u7b56\u7565&#xff1a;<\/p>\n<p>sudo iptables -P INPUT DROP<br \/>\nsudo iptables -P FORWARD DROP<br \/>\nsudo iptables -P OUTPUT ACCEPT<\/p>\n<p>\u7136\u540e\u7cbe\u7ec6\u5316\u653e\u884c&#xff1a;<\/p>\n<ul>\n<li>\u5141\u8bb8\u653b\u51fb\u673a\u8bbf\u95ee\u4ee3\u7406\u673a<\/li>\n<li>\u5141\u8bb8\u4ee3\u7406\u673a\u8bbf\u95ee\u5185\u7f51<\/li>\n<li>\u7981\u6b62\u653b\u51fb\u673a\u76f4\u63a5\u8bbf\u95ee\u5185\u7f51<\/li>\n<\/ul>\n<p>\u5173\u952e\u963b\u65ad\u89c4\u5219&#xff1a;<\/p>\n<p>sudo iptables -A FORWARD -s 192.168.36.0\/24 -d 192.168.3.0\/24 -j DROP<\/p>\n<p>\u53ea\u6709\u52a0\u5165\u8fd9\u6761\u89c4\u5219\u540e&#xff0c;\u6574\u4e2a\u4e09\u5c42\u9694\u79bb\u6a21\u578b\u624d\u771f\u6b63\u7a33\u5b9a\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u5b9e\u9a8c\u4e2d\u8e29\u8fc7\u7684\u5751<\/h3>\n<p>\u6700\u5f00\u59cb\u6211\u53d1\u73b0\u653b\u51fb\u673a\u7adf\u7136\u53ef\u4ee5 ping \u901a\u5185\u7f51\u3002<\/p>\n<p>\u6392\u67e5\u4e86\u5f88\u4e45\u3002<\/p>\n<p>\u540e\u6765\u53d1\u73b0\u662f VMware \u865a\u62df\u7f51\u7edc\u7684\u4f18\u5316\u8f6c\u53d1\u673a\u5236\u5bfc\u81f4\u6d41\u91cf\u7ed5\u8fc7\u4e86\u9884\u671f\u8def\u5f84\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u662f&#xff1a;<\/p>\n<p>\u5728\u653b\u51fb\u673a\u4e0a\u5f3a\u5236\u6dfb\u52a0\u8def\u7531&#xff0c;\u8ba9\u6240\u6709\u76ee\u6807\u6d41\u91cf\u5fc5\u987b\u7ecf\u8fc7\u4ee3\u7406\u673a&#xff1a;<\/p>\n<p>sudo ip route add 192.168.2.0\/24 via 192.168.36.133<br \/>\nsudo ip route add 192.168.3.0\/24 via 192.168.36.133<\/p>\n<p>\u8fd9\u4e00\u70b9\u5982\u679c\u5ffd\u7565&#xff0c;\u6574\u4e2a\u9694\u79bb\u6a21\u578b\u4f1a\u5931\u6548\u3002<\/p>\n<p>\u8fd9\u662f\u672c\u6b21\u5b9e\u9a8c\u6700\u82b1\u65f6\u95f4\u7684\u5730\u65b9\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u6f0f\u6d1e\u8bbe\u8ba1<\/h3>\n<p>\u4e3a\u4e86\u6a21\u62df\u771f\u5b9e\u6e17\u900f\u8def\u5f84&#xff0c;\u6211\u5728\u4e24\u4e2a\u8282\u70b9\u5206\u522b\u8bbe\u8ba1\u6f0f\u6d1e\u3002<\/p>\n<hr \/>\n<h4>(1) \u4ee3\u7406\u673a\u6f0f\u6d1e<\/h4>\n<h5>\u5f31\u53e3\u4ee4 SSH<\/h5>\n<p>\u7528\u6237\u540d&#xff1a;student \u5bc6\u7801&#xff1a;students<\/p>\n<p>\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u66b4\u529b\u7834\u89e3\u83b7\u53d6\u8df3\u677f\u6743\u9650\u3002<\/p>\n<hr \/>\n<h5>Redis \u672a\u6388\u6743\u8bbf\u95ee<\/h5>\n<p>Redis \u9ed8\u8ba4\u76d1\u542c 0.0.0.0 \u4e14\u672a\u8bbe\u7f6e\u5bc6\u7801\u3002<\/p>\n<p>\u653b\u51fb\u8005\u53ef\u76f4\u63a5\u8fde\u63a5&#xff1a;<\/p>\n<p>redis-cli -h 192.168.2.10<\/p>\n<p>\u53ef\u8bfb\u53d6\u6216\u5199\u5165\u654f\u611f\u6570\u636e\u3002<\/p>\n<hr \/>\n<h4>(2) \u5185\u7f51\u673a\u6f0f\u6d1e \u2014\u2014 Flask SSTI<\/h4>\n<p>\u8fd9\u662f\u672c\u5b9e\u9a8c\u7684\u6838\u5fc3\u6f0f\u6d1e\u3002<\/p>\n<p>\u6784\u9020\u4e86\u4e00\u4e2a\u5b58\u5728\u6a21\u677f\u6ce8\u5165\u7684 Flask \u670d\u52a1&#xff1a;<\/p>\n<p>tmpl &#061; f&#034;&lt;h1&gt;{name} is sb&lt;\/h1&gt;&#034;<br \/>\nreturn render_template_string(tmpl)<\/p>\n<p>\u7528\u6237\u8f93\u5165\u76f4\u63a5\u62fc\u63a5\u5230\u6a21\u677f\u4e2d&#xff0c;\u5bfc\u81f4 SSTI\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u653b\u51fb\u94fe\u5b8c\u6574\u590d\u73b0<\/h3>\n<p>\u5b8c\u6574\u653b\u51fb\u8def\u5f84\u5982\u4e0b&#xff1a;<\/p>\n<li>SSH \u767b\u5f55\u4ee3\u7406\u673a<\/li>\n<li>\u5229\u7528 Redis \u672a\u6388\u6743\u8bbf\u95ee<\/li>\n<li>\u4f7f\u7528 socat \u7aef\u53e3\u8f6c\u53d1\u66b4\u9732\u5185\u7f51\u670d\u52a1<\/li>\n<li>\u8bbf\u95ee Flask \u5e94\u7528<\/li>\n<li>\u6784\u9020 SSTI payload<\/li>\n<li>\u901a\u8fc7 RCE \u8bfb\u53d6 flag<\/li>\n<p>SSTI payload \u793a\u4f8b&#xff08;URL \u7f16\u7801\u524d&#xff09;&#xff1a;<\/p>\n<p>{{url_for.__globals__.__builtins__[&#039;eval&#039;](&#034;__import__(&#039;os&#039;).popen(&#039;cat \/home\/kali\/vuln_flask\/flag.txt&#039;).read()&#034;)}}<\/p>\n<p>\u6700\u7ec8\u6210\u529f\u83b7\u53d6\u5185\u7f51 flag\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u672c\u5b9e\u9a8c\u7684\u6280\u672f\u6536\u83b7<\/h3>\n<p>\u901a\u8fc7\u672c\u6b21\u5b9e\u9a8c&#xff0c;\u6211\u6df1\u5165\u7406\u89e3\u4e86&#xff1a;<\/p>\n<ul>\n<li>Linux \u8def\u7531\u673a\u5236<\/li>\n<li>NAT \u5de5\u4f5c\u539f\u7406<\/li>\n<li>iptables FORWARD \u94fe\u903b\u8f91<\/li>\n<li>\u7f51\u7edc\u5206\u5c42\u9694\u79bb\u6a21\u578b<\/li>\n<li>Redis \u914d\u7f6e\u98ce\u9669<\/li>\n<li>Flask SSTI \u5229\u7528\u94fe<\/li>\n<li>\u4ece Web \u6f0f\u6d1e\u5230\u7cfb\u7edf\u7ea7 RCE \u7684\u8fc7\u7a0b<\/li>\n<\/ul>\n<p>\u76f8\u6bd4\u5355\u7eaf\u505a CTF \u9898\u76ee&#xff0c;\u8fd9\u79cd\u5b8c\u6574\u73af\u5883\u642d\u5efa\u66f4\u63a5\u8fd1\u771f\u5b9e\u4f01\u4e1a\u653b\u9632\u3002<\/p>\n<hr 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