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CVE-2021-41088

8.0 · HIGH

Elvish is a programming language and interactive shell, combined into one package.

Published Sep 23, 2021CWE-668EPSS 0.54%

Overview

CVE-2021-41088 is a high-severity vulnerability. It was published on September 23, 2021 and has a CVSS 3.1 base score of 8.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Elvish is a programming language and interactive shell, combined into one package. In versions prior to 0.14.0 Elvish's web UI backend (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI. The backend does not check the origin of requests correctly. As a result, if the user has the web UI backend open and visits a compromised or malicious website, the website can send arbitrary code to the endpoint in localhost. All Elvish releases from 0.14.0 onward no longer include the the web UI, although it is still possible for the user to build a version from source that includes the web UI. The issue can be patched for previous versions by removing the web UI (found in web, pkg/web or pkg/prog/web, depending on the exact version).

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

GitHubgithub.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5GitHubgithub.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3rGitHubgithub.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5GitHubgithub.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41088?

CVE-2021-41088 is a high-severity vulnerability. It was published on September 23, 2021 and has a CVSS 3.1 base score of 8.0 (HIGH).

How severe is CVE-2021-41088?

This vulnerability has a CVSS 3.1 base score of 8.0, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-41088?

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-2021-41088?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41088 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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