cbor-sync through 1.0.4 contains a resource exhaustion vulnerability in CBOR.decode that trusts declared array and map lengths without checking remaining input. Remote attackers can supply a tiny crafted CBOR payload declaring huge lengths to drive billions of iterations, exhausting CPU and process memory.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/PelionIoT/cbor-sync
disclosure@vulncheck.com
https://github.com/PelionIoT/cbor-sync/issues/6
disclosure@vulncheck.com
https://github.com/PelionIoT/cbor-sync/pull/4
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/cbor-sync-through-1.0.4-memory-exhaustion-…
disclosure@vulncheck.com