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CVE-2018-20187

5.9 · MEDIUM

A side-channel issue was discovered in Botan before 2.9.0.

Published Mar 8, 2019CWE-320EPSS 1.52%

Overview

CVE-2018-20187 is a medium-severity vulnerability. It was published on March 8, 2019 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.

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

Refbotan.randombit.net/news.htmlRefbotan.randombit.net/security.htmlGitHubgithub.com/crocs-muni/ECTesterRefbotan.randombit.net/news.htmlRefbotan.randombit.net/security.htmlGitHubgithub.com/crocs-muni/ECTester

How CyberStrike helps

Frequently asked questions

What is CVE-2018-20187?

CVE-2018-20187 is a medium-severity vulnerability. It was published on March 8, 2019 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

How severe is CVE-2018-20187?

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-20187?

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-2018-20187?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-20187 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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