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[thi.ng/egf] Potential arbitrary code execution of `#gpg`-tagged property values

Moderate severity GitHub Reviewed Published Mar 30, 2021 in thi-ng/umbrella • Updated Feb 1, 2023

Package

npm @thi.ng/egf (npm)

Affected versions

< 0.4.0

Patched versions

0.4.0

Description

Impact

Potential for arbitrary code execution in #gpg-tagged property values (only if decrypt: true option is enabled)

Patches

A fix has already been released as v0.4.0

Workarounds

By default, EGF parse functions do NOT attempt to decrypt values (since GPG is only available in non-browser env).

However, if GPG encrypted values are used/required:

  1. Perform a regex search for #gpg-tagged values in the EGF source file/string and check for backtick (`) chars in the encrypted value string
  2. Replace/remove them or skip parsing if present...

References

https://github.com/thi-ng/umbrella/security/advisories/GHSA-rj44-gpjc-29r7#advisory-comment-65261

For more information

If you have any questions or comments about this advisory, please open an issue in the thi.ng/umbrella repo, of which this package is part of.

References

@postspectacular postspectacular published to thi-ng/umbrella Mar 30, 2021
Reviewed Mar 30, 2021
Published by the National Vulnerability Database Mar 30, 2021
Published to the GitHub Advisory Database Apr 6, 2021
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS score

0.157%
(53rd percentile)

Weaknesses

CVE ID

CVE-2021-21412

GHSA ID

GHSA-rj44-gpjc-29r7

Source code

No known source code

Credits

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