CVE-2020-12885: arm mbed_os Infinite Loop

Vulnerability summary

CVE-2020-12885 is a high (CVSS 7.8) Infinite Loop vulnerability in arm mbed_os. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 68.6% of scored vulnerabilities.

Timeline

1. 18-06-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An infinite loop 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 in a while loop. This loop's exit condition is computed using the previously allocated heap memory required for storing the result of parsing multiple options. If the input heap memory calculation results in zero bytes, the loop exit condition is never met and the loop is not terminated. As a result, the packet parsing function never exits, leading to resource consumption.

• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.