CVE-2020-12884
First published: Thu Jun 18 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Arm Mbed | =5.15.3 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-12884?
The severity of CVE-2020-12884 has not been explicitly rated, but it is categorized as a buffer over-read vulnerability which can pose significant risks.
How do I fix CVE-2020-12884?
To fix CVE-2020-12884, you should upgrade to a patched version of Arm Mbed OS that addresses this vulnerability.
What systems are affected by CVE-2020-12884?
CVE-2020-12884 affects the CoAP library in Arm Mbed OS version 5.15.3.
What type of vulnerability is CVE-2020-12884?
CVE-2020-12884 is classified as a buffer over-read vulnerability in the CoAP parser.
What components are implicated in CVE-2020-12884?
CVE-2020-12884 specifically involves the parsing function sn_coap_parser_options_parse_multiple_options in the CoAP library.
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