Intrusion recovery for database-backed web applications

Ramesh Chandra, Taesoo Kim, Meelap Shah, Neha Narula, N. Zeldovich
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引用次数: 57

Abstract

Warp is a system that helps users and administrators of web applications recover from intrusions such as SQL injection, cross-site scripting, and clickjacking attacks, while preserving legitimate user changes. Warp repairs from an intrusion by rolling back parts of the database to a version before the attack, and replaying subsequent legitimate actions. Warp allows administrators to retroactively patch security vulnerabilities---i.e., apply new security patches to past executions---to recover from intrusions without requiring the administrator to track down or even detect attacks. Warp's time-travel database allows fine-grained rollback of database rows, and enables repair to proceed concurrently with normal operation of a web application. Finally, Warp captures and replays user input at the level of a browser's DOM, to recover from attacks that involve a user's browser. For a web server running MediaWiki, Warp requires no application source code changes to recover from a range of common web application vulnerabilities with minimal user input at a cost of 24--27% in throughput and 2--3.2 GB/day in storage.
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数据库支持的web应用程序的入侵恢复
Warp是一个系统,可以帮助web应用程序的用户和管理员从SQL注入、跨站点脚本和点击劫持攻击等入侵中恢复,同时保留合法的用户更改。Warp通过回滚部分数据库到攻击前的版本,并重播随后的合法操作来修复入侵。Warp允许管理员追溯性地修补安全漏洞。,对过去的执行应用新的安全补丁——从入侵中恢复,而不需要管理员跟踪甚至检测攻击。Warp的时间旅行数据库允许对数据库行进行细粒度的回滚,并使修复与web应用程序的正常操作同时进行。最后,Warp在浏览器DOM级别捕获并重放用户输入,以便从涉及用户浏览器的攻击中恢复。对于运行MediaWiki的web服务器,Warp不需要更改应用程序源代码就可以从一系列常见的web应用程序漏洞中恢复,只需最少的用户输入,吞吐量降低24- 27%,存储空间降低2- 3.2 GB/天。
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