CVE-2021-41088: Github.com/elves/elvish Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-fpv6-f8jw-rc3r
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CVSS 8.0
CWE-668 CWE-346
Published
Advisory Summary

CVE-2021-41088 is a HIGH (CVSS 8.0) remote code execution vulnerability (CWE-668: Exposure of Resource to Wrong Sphere) affecting Github.com/elves/elvish libraries in the Go ecosystem. The issue involves elvish vulnerable to remote code execution via the web ui backend. Remediation is available by upgrading affected packages to version 0.14.0.

CVE-2021-41088 at a Glance

CVE Identifier CVE-2021-41088
GHSA Identifier GHSA-fpv6-f8jw-rc3r
Severity HIGH
CVSS v3.1 Base Score 8.0
CWE Classification CWE-668: Exposure of Resource to Wrong Sphere
Affected Product Github.com/elves/elvish
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-41088

To remediate this vulnerability, upgrade all affected Github.com/elves/elvish dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/elves/elvish fixed: 0.14.0 
Upgrade github.com/elves/elvish to 0.14.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/elves/elvish

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-41088, inspect your project dependencies for Github.com/elves/elvish:

inspect dependencies for github.com/elves/elvish

Analyze the terminal output to locate any version of Github.com/elves/elvish in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.14.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-668: Exposure of Resource to Wrong Sphere, where the product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. In Github.com/elves/elvish, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Elvish's backend for the experimental web UI (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. ### Patches All Elvish releases since 0.14.0 no longer include the experimental web UI, although it is still possible for the user to build a version from source that includes it. 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). ### Workarounds Do not use the experimental web UI. ### For more information If you have any questions or comments about this advisory, please email xiaqqaix@gmail.com.

CVE-2021-41088 Affected Github.com/elves/elvish Versions

1 component(s)
Fixed Versions:
0.14.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/elves/elvish
golang/github.com/elves/elvish
Go
< 0.14.0
0.14.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r
NVD — CVE-2021-41088 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41088
Security Fix Commit FIX COMMIT
https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5
Github.com/elves/elvish Source Repository REPOSITORY
https://github.com/elves/elvish

Frequently Asked Questions

What is CVE-2021-41088?
CVE-2021-41088 is a security vulnerability in Github.com/elves/elvish involving Elvish vulnerable to remote code execution via the web UI backend under CWE-668: Exposure of Resource to Wrong Sphere.
Which Github.com/elves/elvish versions are affected?
Affected versions include releases prior to 0.14.0 across affected packages: github.com/elves/elvish.
What version fixes CVE-2021-41088?
Upgrading to 0.14.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/elves/elvish affected?
Yes, github.com/elves/elvish is affected in releases prior to 0.14.0. Upgrade your dependency to 0.14.0 or later.
What is the CVSS score of CVE-2021-41088?
CVE-2021-41088 has a CVSS v3.1 base score of 8.0 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2021-41088?
CVE-2021-41088 is classified under CWE-668: Exposure of Resource to Wrong Sphere (The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.).
How can I check Go dependencies for CVE-2021-41088?
Run the dependency tree command: 'inspect dependencies for github.com/elves/elvish'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fpv6-f8jw-rc3r",
  "modified" : "2022-08-15T20:07:49Z",
  "published" : "2021-09-23T23:17:33Z",
  "aliases" : [ "CVE-2021-41088" ],
  "summary" : "Elvish vulnerable to remote code execution via the web UI backend",
  "details" : "### Impact\n\nElvish's backend for the experimental web UI (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI.\n\nThe 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.\n\n### Patches\n\nAll Elvish releases since 0.14.0 no longer include the experimental web UI, although it is still possible for the user to build a version from source that includes it.\n\nThe 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).\n\n### Workarounds\n\nDo not use the experimental web UI.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please email xiaqqaix@gmail.com.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/elves/elvish"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.14.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/elves/elvish/security/advisories/GHSA-fpv6-f8jw-rc3r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41088"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/elves/elvish/commit/ccc2750037bbbfafe9c1b7a78eadd3bd16e81fe5"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/elves/elvish"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346", "CWE-668" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-23T21:06:47Z",
    "nvd_published_at" : "2021-09-23T20:15:00Z"
  }
}