Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server.
This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
@backstage:plugin-proxy-backend
backstage:backstage
References 3
https://github.com/backstage/backstage/security/advisories/GHSA-9ghw-48h5-v2w5
https://github.com/backstage/backstage/security/advisories/GHSA-9ghw-48h5-v2w5
https://github.com/backstage/backstage/commit/233287d0ce3133e41549bf92a7470c940…
https://github.com/backstage/backstage/commit/233287d0ce3133e41549bf92a7470c940a41753c
https://github.com/backstage/backstage/releases/tag/v1.54.6
https://github.com/backstage/backstage/releases/tag/v1.54.6