msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.
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
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/msgpack/msgpack-java
disclosure@vulncheck.com
https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java…
disclosure@vulncheck.com
https://github.com/msgpack/msgpack-java/issues/1014
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overfl…
disclosure@vulncheck.com