Abstract
The use of vulnerable open-source dependencies is a known problem in today's software development. Several vulnerability scanners to detect known-vulnerable dependencies appeared in the last decade, however, there exists no case study investigating the impact of development practices, e.g., forking, patching, re-bundling, on their performance. This paper studies (i) types of modifications that may affect vulnerable open-source dependencies and (ii) their impact on the performance of vulnerability scanners. Through an empirical study on 7,024 Java projects developed at <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SAP</i> , we identified four types of modifications: re-compilation, re-bundling, metadata-removal and re-packaging. In particular, we found that more than 87 percent (56 percent, resp.) of the vulnerable Java classes considered occur in Maven Central in re-bundled (re-packaged, resp.) form. We assessed the impact of these modifications on the performance of the open-source vulnerability scanners OWASP Dependency-Check (OWASP) and Eclipse Steady, GitHub Security Alerts, and three commercial scanners. The results show that none of the scanners is able to handle all the types of modifications identified. Finally, we present <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Achilles</i> , a novel test suite with 2,505 test cases that allow replicating the modifications on open-source dependencies.
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