CVE-2021-20319

Description

An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation image can bypass the image signature verification and as a consequence can lead to the installation of unsigned content. An attacker able to modify the original installation image can write arbitrary data, and achieve full access to the node being installed.

References

Link	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2011862	vendor advisory issue tracking
https://github.com/coreos/coreos-installer/security/advisories/GHSA-3r3g-g73x-g593	third party advisory
https://github.com/coreos/coreos-installer/pull/659/commits/ad243c6f0eff2835b2da56ca5f7f33af76253c89	third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-20319?: CVE-2021-20319 has been scored as a high severity vulnerability.
How to fix CVE-2021-20319?: To fix CVE-2021-20319, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20319 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-20319 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20319?: CVE-2021-20319 affects n/a coreos-installer.

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Description

Category

CWE-347 – Improper Verification of Cryptographic Signature

References

Frequently Asked Questions