Description
libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.
Problem types
Product status
Any version before v4.3.5b
Credits
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
References
github.com/...ommit/b7847c4dbb0dbee7c90b09a673d4cae256f03718