Automatic Discovery of API-Level Exploits

Vinod Ganapathy, Sanjit A. Seshia, Somesh Jha, Thomas W. Reps, Randal E. Bryant.

Proceedings of the 27th International Conference on Software Engineering (ICSE 2005); pages 312--321; St. Louis, Missouri; May 15-21, 2005.

We argue that finding vulnerabilities in software components is different from finding exploits against them. Exploits that compromise security often use several low-level details of the component, such as layouts of stack frames. Existing software analysis tools, while effective at identifying vulnerabilities, fail to model low-level details, and are hence unsuitable for exploit-finding.

We study the issues involved in exploit-finding by considering application programming interface (API) level exploits. A software component is vulnerable to an API-level exploit if its security can be compromised by invoking a sequence of API operations allowed by the component. We develop a formal framework that allows us to model low-level details of API operations, and develop an automatic technique based upon bounded, infinite-state model checking to discover API-level exploits.

We present two instantiations of this framework. We show that format-string exploits can be modeled as API-level exploits, and demonstrate our technique by finding exploits against vulnerabilities in widely-used software. We also use the framework to model a cryptographic-key management API (the IBM CCA) and demonstrate a tool that identifies a previously known exploit.

Paper: [ PDF | HTML ] (© ACM/IEEE)
Slides: [ Powerpoint | PDF | HTML ]
DOI: [ 10.1145/1062455.1062518 ]


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