Zip Slip Arbitrary File Overwrite Vulnerability Analysis and Mitigation

Key Information: 1. Definition and Impact of Zip Slip Vulnerability: - Zip Slip is a common arbitrary file overwrite vulnerability that often leads to remote command execution. - It was discovered and responsibly disclosed by the Snyk security team on June 5, 2018, affecting thousands of projects, including those from HP, Amazon, Apache, and Pivotal. - This vulnerability has been found across multiple ecosystems, including JavaScript, Ruby, .NET, and Go, but is especially prevalent in Java, as Java lacks high-level libraries for handling archive (e.g., zip) files. 2. Exploitation of the Vulnerability: - Exploitation requires a specially crafted archive containing directory traversal filenames (e.g., ). - The vulnerability affects various archive formats, including tar, jar, war, cpio, apk, rar, and 7z. - If you need to download the technical whitepaper, you can click the button on the page. 3. Exploitation Process: - Exploiting this vulnerability requires a malicious archive and extraction code that does not perform validation checks. - First, one or more files must be included that, when extracted, traverse out of the target directory. - Second, a tool or library capable of extracting archives is needed, which does not perform necessary directory traversal validation during extraction. 4. Affected Projects: - Snyk maintains a GitHub repository listing all known projects affected by the Zip Slip vulnerability, including fix dates and versions. - Affected projects include Oracle, Amazon, Spring/Pivotal, LinkedIn, Twitter, Alibaba, Jenkins, Eclipse, OWASP, SonarQube, OpenTable, Arduino, ElasticSearch, Selenium, JetBrains, and Google. 5. Recommended Actions: - Check whether your project’s dependencies contain the Zip Slip vulnerability. - Integrate Zip Slip security testing into your application build pipeline. - Use Snyk or other dependency vulnerability scanning tools to determine if you are using affected libraries. 6. Acknowledgments: - The Snyk security team thanks all vendors, project owners, and community members who contributed to raising awareness, discovering, and fixing the vulnerability.

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Zip Slip Arbitrary File Overwrite Vulnerability Analysis and Mitigation