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CVE-2020-12402

4.4 · MEDIUM

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow.

Published Jul 9, 2020CWE-203EPSS 0.34%

Overview

CVE-2020-12402 is a medium-severity vulnerability. It was published on July 9, 2020 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2020-07/msg00016.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00018.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00027.htmlReflists.opensuse.org/opensuse-security-announce/2020-07/msg00049.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1631597Reflists.debian.org/debian-lts-announce/2020/09/msg00029.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/Refsecurity.gentoo.org/glsa/202007-10Refusn.ubuntu.com/4417-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-12402?

CVE-2020-12402 is a medium-severity vulnerability. It was published on July 9, 2020 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2020-12402?

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-12402?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-12402?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-12402 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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