{"id":164925,"date":"2013-02-01T00:00:00","date_gmt":"2013-02-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/fixmeup-repairing-access-control-bugs-in-web-applications\/"},"modified":"2018-10-16T21:16:16","modified_gmt":"2018-10-17T04:16:16","slug":"fixmeup-repairing-access-control-bugs-in-web-applications","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/fixmeup-repairing-access-control-bugs-in-web-applications\/","title":{"rendered":"FixMeUp: Repairing Access-Control Bugs in Web Applications"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Access-control policies in Web applications ensure that only authorized users can perform security-sensitive operations. These policies usually check user credentials before executing actions such as writing to the database or navigating to privileged pages. Typically, every Web application uses its own, hand-crafted program logic to enforce access control. Within a single application, this logic can vary between different user roles, e.g., administrator or regular user. Unfortunately, developers forget to include proper access-control checks, a lot.<\/p>\n<p>This paper presents the design and implementation of FIXMEUP, a static analysis and transformation tool that \ufb01nds access-control errors of omission and produces candidate repairs. FIXMEUP starts with a high-level speci\ufb01cation that indicates the conditional statement of a correct access-control check and automatically computes an inter- procedural access-control template (ACT), which includes all program statements involved in this instance of access- control logic. The ACT serves as both a low-level policy speci\ufb01cation and a program transformation template. FIXMEUP uses the ACT to \ufb01nd faulty access-control logic that misses some or all of these statements, inserts only the missing statements, and ensures that unintended dependences did not change the meaning of the access-control policy. FIXMEUP then presents the transformed program to the developer, who decides whether to accept the proposed repair. Our evaluation on ten real-world PHP applications shows that FIXMEUP is capable of \ufb01nding subtle access-control bugs and performing semantically correct repairs.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Access-control policies in Web applications ensure that only authorized users can perform security-sensitive operations. These policies usually check user credentials before executing actions such as writing to the database or navigating to privileged pages. Typically, every Web application uses its own, hand-crafted program logic to enforce access control. Within a single application, this logic can [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"Network and Distributed System Security Symposium (NDSS)","msr_chapter":"","msr_edition":"Network and Distributed System Security Symposium (NDSS)","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"Network and Distributed System Security Symposium (NDSS)","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"Sooel Son, Vitaly 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