CVE-2021-3762

Path traversal in claircore

A directory traversal vulnerability was found in the ClairCore engine of Clair. An attacker can exploit this by supplying a crafted container image which, when scanned by Clair, allows for arbitrary file write on the filesystem, potentially allowing for remote code execution.

Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.

CVE-2021-3762 has a CVSS score of 7.8 (High). The vector is requires local access, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.4.8, 1.1.0, 0.5.5); upgrading removes the vulnerable code path.

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1. What is CVE-2021-3762? CVE-2021-3762 is a high-severity path traversal vulnerability in github.com/quay/claircore (go), affecting versions < 0.4.8. It is fixed in 0.4.8, 1.1.0, 0.5.5. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
2. How severe is CVE-2021-3762? CVE-2021-3762 has a CVSS score of 7.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of github.com/quay/claircore are affected by CVE-2021-3762? github.com/quay/claircore (go) versions < 0.4.8 is affected.
4. Is there a fix for CVE-2021-3762? Yes. CVE-2021-3762 is fixed in 0.4.8, 1.1.0, 0.5.5. Upgrade to this version or later.
5. Is CVE-2021-3762 exploitable, and should I be worried? Whether CVE-2021-3762 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2021-3762 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2021-3762?
   • Upgrade github.com/quay/claircore to 0.4.8 or later
   • Upgrade github.com/quay/claircore to 1.1.0 or later
   • Upgrade github.com/quay/claircore to 0.5.5 or later

Other vulnerabilities in github.com/quay/claircore