Vulnerability Description
A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_options() parses CoAP options that may occur multiple consecutive times in a single packet. While processing the options, packet_data_pptr is accessed after being incremented by option_len without a prior out-of-bounds memory check. The temp_parsed_uri_query_ptr is validated for a correct range, but the range valid for temp_parsed_uri_query_ptr is derived from the amount of allocated heap memory, not the actual input size. Therefore the check of temp_parsed_uri_query_ptr may be insufficient for safe access to the area pointed to by packet_data_pptr. As a result, access to a memory area outside of the intended boundary of the packet buffer is made.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Os | 5.15.3 |
Related Weaknesses (CWE)
References
- https://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
- https://github.com/ARMmbed/mbed-os/issues/12928Third Party Advisory
- https://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
- https://github.com/ARMmbed/mbed-os/issues/12928Third Party Advisory
FAQ
What is CVE-2020-12884?
CVE-2020-12884 is a vulnerability with a CVSS score of 9.1 (CRITICAL). A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse_multiple_option...
How severe is CVE-2020-12884?
CVE-2020-12884 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2020-12884?
Check the references section above for vendor advisories and patch information. Affected products include: Arm Mbed Os.