CVE-2020-12883

Buffer over-reads were 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() parses CoAP input linearly using a while loop. Once an option is parsed in a loop, the current point (*packet_data_pptr) is increased correspondingly. The pointer is restricted by the size of the received buffer, as well as by the option delta and option length bytes. The actual input packet length is not verified against the number of bytes read when processing the option extended delta and the option extended length. Moreover, the calculation of the message_left variable, in the case of non-extended option deltas, is incorrect and indicates more data left for processing than provided in the function input. All of these lead to heap-based or stack-based memory location read access that is outside of the intended boundary of the buffer. Depending on the platform-specific memory management mechanisms, it can lead to processing of unintended inputs or system memory access violation errors.

Link	Resource
https://github.com/ARMmbed/mbed-os/issues/12925	Third Party Advisory
https://github.com/ARMmbed/mbed-coap/pull/116	Third Party Advisory
https://github.com/ARMmbed/mbed-os/issues/12927	Third Party Advisory
https://github.com/ARMmbed/mbed-os/issues/12926	Third Party Advisory

Configuration 1

cpe:2.3:o:arm:mbed_os:5.15.3:*:*:*:*:*:*:*

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Published : 2020-06-18 07:15

Updated : 2021-07-21 11:39

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NVD link : CVE-2020-12883

Mitre link : CVE-2020-12883

No products.

CWE-125

Out-of-bounds Read