RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic 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)
References 4
https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/…
security-advisories@github.com
https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d
security-advisories@github.com
https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1
security-advisories@github.com
https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2
security-advisories@github.com