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Script injection

Moderate severity GitHub Reviewed Published Jun 3, 2021 in backstage/backstage • Updated Feb 1, 2023

Package

npm @backstage/techdocs-common (npm)

Affected versions

< 0.6.4

Patched versions

0.6.4

Description

Impact

A malicious internal actor is able to upload documentation content with malicious scripts. These scripts would normally be sanitized by the TechDocs frontend, but by tricking a user to visit the content via the TechDocs API, the content sanitazion will be bypassed. If the TechDocs API is hosted on the same origin as the Backstage app or other backend plugins, this may give access to sensitive data.

The ability to upload malicious content may be limited by internal code review processes, unless the chosen TechDocs deployment method is to use an object store and the actor has access to upload files directly to that store.

Patches

The vulnerability is patched in the 0.6.4 release of @backstage/techdocs-common.

For more information

If you have any questions or comments about this advisory:

References

@Rugvip Rugvip published to backstage/backstage Jun 3, 2021
Published by the National Vulnerability Database Jun 3, 2021
Reviewed Jun 3, 2021
Published to the GitHub Advisory Database Jun 4, 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
High
User interaction
Required
Scope
Unchanged
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:H/UI:R/S:U/C:H/I:H/A:H

EPSS score

0.152%
(52nd percentile)

Weaknesses

CVE ID

CVE-2021-32660

GHSA ID

GHSA-pwhf-39xg-4rxw

Source code

No known source code
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