rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes3 then verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access key identifier as both the user and authentication value to the proxy without an independent per-identity secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an empty secret, and reach whatever backend the auth-proxy script resolves for that identity.
This issue is fixed in version 1.75.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Rclone Rclone
cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*
|
— |
1.75.1
|
References 3
https://github.com/rclone/rclone/commit/90595f34f27f569be6b27c57fe5ab65057d323bd
security-advisories@github.com
https://github.com/rclone/rclone/releases/tag/v1.75.1
security-advisories@github.com
https://github.com/rclone/rclone/security/advisories/GHSA-xwwr-4h3p-r22c
security-advisories@github.com