CVE-2021-41088

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).

How to fix CVE-2021-41088

To remediate CVE-2021-41088, upgrade the affected package to a fixed version below.

• —upgrade to 0.14.0-1 or later
• —upgrade to 0.14.0 or later
• —upgrade to 0.14.0 or later

Is CVE-2021-41088 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0, < 0.14.0-1
• from 0, < 0.14.0
• from 0, < 0.14.0

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-41088
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-41088
• PATCHgithub.com/elves/elvish
• WEBgithub.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5