ARM Mbed OS 5.14.0 CoAP Library sn_coap_parser_options_parse out-of-bounds write

Summaryinfo

A vulnerability identified as critical has been detected in ARM Mbed OS 5.14.0. This issue affects the function sn_coap_parser_options_parse of the component CoAP Library. Performing a manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2019-17212. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in ARM Mbed OS 5.14.0. It has been classified as critical. This affects the function sn_coap_parser_options_parse of the component CoAP Library. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflows were discovered in the CoAP library in Arm Mbed OS 5.14.0. 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 0xFF delimiter byte. Inside each while loop, the check of the value of *packet_data_pptr is not strictly enforced. More specifically, inside a loop, *packet_data_pptr could be increased and then dereferenced without checking. Moreover, there are many other functions in the format of sn_coap_parser_****() that do not check whether the pointer is within the bounds of the allocated buffer. All of these lead to heap-based or stack-based buffer overflows, depending on how the CoAP packet buffer is allocated.

The weakness was released 11/05/2019. This vulnerability is uniquely identified as CVE-2019-17212 since 10/06/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entry connected to this vulnerability is available at VDB-144950. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• ARM

Name

• Mbed OS

Version

• 5.14.0

License

• commercial

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Be aware that VulDB is the high quality source for vulnerability data.

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