Vulnerability Details : CVE-2021-41088
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).
Exploit prediction scoring system (EPSS) score for CVE-2021-41088
Probability of exploitation activity in the next 30 days: 0.21%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 58 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-41088
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
9.3
|
HIGH | AV:N/AC:M/Au:N/C:C/I:C/A:C |
8.6
|
10.0
|
NIST |
|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST |
|
8.0
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H |
1.3
|
6.0
|
GitHub, Inc. |
CWE ids for CVE-2021-41088
-
The product does not properly verify that the source of data or communication is valid.Assigned by: nvd@nist.gov (Primary)
-
The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2021-41088
-
https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5
Remove the experimental web UI. · elves/elvish@ccc2750 · GitHubPatch;Third Party Advisory
-
https://github.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r
Remote code execution via the web UI backend · Advisory · elves/elvish · GitHubThird Party Advisory
Products affected by CVE-2021-41088
- cpe:2.3:a:elv:elvish:*:*:*:*:*:*:*:*