CVE-2021-43776

Published on: Not Yet Published

Last Modified on: 11/30/2021 07:11:00 PM UTC

CVE-2021-43776 - advisory for GHSA-w7fj-336r-vw49

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Certain versions of Auth Backend from Linuxfoundation contain the following vulnerability:

Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.

  • CVE-2021-43776 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.
  • Affected Vendor/Software: URL Logo backstage - backstage version < 0.4.9

CVSS3 Score: 6.1 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE REQUIRED
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED LOW LOW NONE

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE PARTIAL NONE

CVE References

Description Tags Link
Reflected XSS vulnerability in @backstage/plugin-auth-backend · Advisory · backstage/backstage · GitHub github.com
text/html
URL Logo CONFIRM github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
backstage/plugins/auth-backend at master · backstage/backstage · GitHub github.com
text/html
URL Logo MISC github.com/backstage/backstage/tree/master/plugins/auth-backend

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationLinuxfoundationAuth BackendAllAllAllAll
  • cpe:2.3:a:linuxfoundation:auth_backend:*:*:*:*:*:node.js:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-43776 : Backstage is an open platform for building developer portals. In affected versions the auth-backen… twitter.com/i/web/status/1… 2021-11-26 18:18:05
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