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XSS via prototype pollution in NodeBB

Critical severity GitHub Reviewed Published Nov 27, 2021 in NodeBB/NodeBB • Updated Jan 31, 2023

Package

npm nodebb (npm)

Affected versions

>= 1.15.0, < 1.18.5

Patched versions

1.18.5

Description

Impact

A prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report.

Patches

The vulnerability has been patched as of v1.18.5.

Workarounds

Cherry-pick commit hash 1783f918bc19568f421473824461ff2ed7755e4c to receive this patch in lieu of a full upgrade.

For more information

If you have any questions or comments about this advisory:

References

@julianlam julianlam published to NodeBB/NodeBB Nov 27, 2021
Published by the National Vulnerability Database Nov 29, 2021
Reviewed Nov 30, 2021
Published to the GitHub Advisory Database Nov 30, 2021
Last updated Jan 31, 2023

Severity

Critical

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
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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:R/S:C/C:H/I:H/A:H

EPSS score

0.115%
(47th percentile)

Weaknesses

CVE ID

CVE-2021-43787

GHSA ID

GHSA-wx69-rvg3-x7fc

Source code

Credits

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