{"id":2252,"date":"2016-07-13T14:00:49","date_gmt":"2016-07-13T12:00:49","guid":{"rendered":"http:\/\/securite.intrinsec.com\/?p=2252"},"modified":"2016-07-13T14:00:49","modified_gmt":"2016-07-13T12:00:49","slug":"cve-2016-5007-spring-security-mvc-path-matching-inconsistency","status":"publish","type":"post","link":"https:\/\/www.intrinsec.com\/en\/cve-2016-5007-spring-security-mvc-path-matching-inconsistency\/","title":{"rendered":"CVE-2016-5007 Spring Security \/ MVC Path Matching Inconsistency"},"content":{"rendered":"<h1>Summary<\/h1>\n<p><strong>Editor:<\/strong> Spring by Pivotal<\/p>\n<p><strong>Product:<\/strong> Spring Web + Spring Security \/ Spring Boot<\/p>\n<p><strong>Title:<\/strong> Spring Security \/ MVC Path Matching Inconsistency<\/p>\n<p><strong>CVE ID:<\/strong> <a href=\"http:\/\/www.cve.mitre.org\/cgi-bin\/cvename.cgi?name=2016-5007\">CVE-2016-5007<\/a><\/p>\n<p><strong>Intrinsec ID:<\/strong> ISEC-V2016-01<\/p>\n<p><strong>Risk level:<\/strong> Medium to high<\/p>\n<p><strong>Usable:<\/strong> remotely<\/p>\n<p><strong>Impact:<\/strong> requests authorization bypass<\/p>\n<h1>Description<\/h1>\n<p>This vulnerability affects Spring Web and Security when used together if <em>HttpSecurity.authorizeRequests<\/em> is used for URL access control. Spring provides an example of this in its Spring Security documentation: <a href=\"http:\/\/docs.spring.io\/spring-security\/site\/docs\/current\/reference\/html\/jc.html#authorize-requests\">http:\/\/docs.spring.io\/spring-security\/site\/docs\/current\/reference\/html\/jc.html#authorize-requests<\/a><\/p>\n<pre><code>\nprotected void configure(HttpSecurity http) throws Exception { http .authorizeRequests() .antMatchers(&quot;\/resources\/**&quot;, &quot;\/signup&quot;, &quot;\/about&quot;).permitAll()\n\t\t\t<span style=\"color: #ff0000;\"><strong>.antMatchers(&quot;\/admin\/**&quot;).hasRole(&quot;ADMIN&quot;) <\/strong> <\/span>\n\t\t\t.antMatchers(&quot;\/db\/**&quot;).access(&quot;hasRole(&#039;ADMIN&#039;) and hasRole(&#039;DBA&#039;)&quot;) .anyRequest().authenticated() .and() \/\/ ... .formLogin(); }\n<\/code>\n<\/pre>\n<p>In the following example, the user \u201cuser\u201d is not an admin and cannot access \u201c\/admin\/\u201d:<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-2254\" src=\"https:\/\/www.intrinsec.com\/wp-content\/uploads\/2016\/07\/cve-2016-5007-1.png\" alt=\"cve-2016-5007 (1)\" width=\"575\" height=\"205\" \/><\/p>\n<p>However, if a space (or another whitespace character) is prepended or appended to \u201cadmin\u201d in the URL, the security filter is easily bypassed.<\/p>\n<ul>\n<li>Space appended (automatically encoded as \u201c%20\u201d by the browser):<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-2255\" src=\"https:\/\/www.intrinsec.com\/wp-content\/uploads\/2016\/07\/cve-2016-5007-2.png\" alt=\"cve-2016-5007 (2)\" width=\"323\" height=\"87\" \/><\/p>\n<ul>\n<li>%0D prepended:<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-2256\" src=\"https:\/\/www.intrinsec.com\/wp-content\/uploads\/2016\/07\/cve-2016-5007-3.png\" alt=\"cve-2016-5007 (3)\" width=\"313\" height=\"74\" \/><\/p>\n<p>The problem is that different matchers are used to implement the access control, and to identify which controller class should handle the request.<\/p>\n<p>The first matcher, used for access control, is strict: \u201cadmin \u201c is considered different than \u201cadmin\u201d:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2257\" src=\"https:\/\/www.intrinsec.com\/wp-content\/uploads\/2016\/07\/cve-2016-5007-4.png\" alt=\"cve-2016-5007 (4)\" width=\"614\" height=\"415\" \/><\/p>\n<p>However, the second matcher, used to find the appropriate controller, applies a trim operation which removes whitespaces before and after each URL token, so \u201cadmin\u201d becomes \u201dadmin\u201d:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2258\" src=\"https:\/\/www.intrinsec.com\/wp-content\/uploads\/2016\/07\/cve-2016-5007-5.png\" alt=\"cve-2016-5007 (5)\" width=\"1165\" height=\"623\" \/><\/p>\n<p>In conclusion: the access control matcher does not recognize the protected path, thus a default \u201callow\u201d rule applies, while the controller finder matcher finds the protected controller.<\/p>\n<p>A mismatch of strictness between both matchers is responsible for this condition.<\/p>\n<h1>versions affected<\/h1>\n<ul>\n<li>Spring Security 3.2.x, 4.0.x, 4.1.0<\/li>\n<li>Spring Framework 3.2.x, 4.0.x, 4.1.x, 4.2.x<\/li>\n<li>Other unsupported versions are also affected<\/li>\n<\/ul>\n<h1>Solutions<\/h1>\n<p>Refer to <a href=\"http:\/\/pivotal.io\/security\/cve-2016-5007\">Pivotal&#039;s CVE-2016-5007 report<\/a> for detailed mitigations.<\/p>\n<h1>Credits<\/h1>\n<p>Vulnerability discovered by Cl\u00e9ment Notin \/ @cnotin, in a challenge of the <a href=\"https:\/\/www.intrinsec.com\/en\/2016\/03\/15\/security-day-2016-de-lesgi-conference-injectme-quand-votre-navigateur-devient-votre-ennemi-et-ctf\/\">\u00abHackLab ESGI Security Day 2016\u00bb CTF<\/a>.<\/p>\n<p>Vulnerability disclosed in coordination with the CERT-INTRINSEC.<\/p>\n<h1>History<\/h1>\n<ul>\n<li>2016-03-04: Vulnerability discovery<\/li>\n<li>2016-03-07: Advisory writing<\/li>\n<li>2016-03-08: Advisory sent to editor<\/li>\n<li>2016-03-08: Advisory received and passed to the Spring Security team for evaluation<\/li>\n<li>2016-03-15: Status update requested<\/li>\n<li>2016-03-17: Status update provided, issue confirmed, project team is assessing options for resolving it<\/li>\n<li>2016-04-19: Status update requested<\/li>\n<li>2016-04-25: Status update provided, options to resolve it while minimizing the impact on backwards compatibility are still discussed<\/li>\n<li>2016-07-07: Vulnerability report and mitigation published by Pivotal<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><em>\u2014 Cl\u00e9ment Notin<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Summary Editor: Spring by Pivotal Product: Spring Web + Spring Security \/ Spring Boot Title: [\u2026]<\/p>","protected":false},"author":1,"featured_media":2271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,19],"tags":[],"class_list":["post-2252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evaluation-securite","category-soc-securite-operationnelle"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>CVE-2016-5007 Spring Security \/ MVC Path Matching Inconsistency - INTRINSEC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.intrinsec.com\/en\/cve-2016-5007-spring-security-mvc-path-matching-inconsistency\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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