CVE-2020-12887

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Summary

CVECVE-2020-12887
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-06-18 19:15:00 UTC
Updated2021-07-21 11:39:00 UTC
DescriptionMemory leaks were discovered in the CoAP library in Arm Mbed OS 5.15.3 when using the Arm mbed-coap library 5.1.5. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP option number field of all options present in the input packet. Each option number is calculated as a sum of the previous option number and a delta of the current option. The delta and the previous option number are expressed as unsigned 16-bit integers. Due to lack of overflow detection, it is possible to craft a packet that wraps the option number around and results in the same option number being processed again in a single packet. Certain options allocate memory by calling a memory allocation function. In the cases of COAP_OPTION_URI_QUERY, COAP_OPTION_URI_PATH, COAP_OPTION_LOCATION_QUERY, and COAP_OPTION_ETAG, there is no check on whether memory has already been allocated, which in conjunction with the option number integer overflow may lead to multiple assignments of allocated memory to a single pointer. This has been demonstrated to lead to memory leak by buffer orphaning. As a result, the memory is never freed.

Risk And Classification

Problem Types: CWE-190 | CWE-401

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Arm Mbed-coap 5.1.5 All All All
Application Arm Mbed-coap 5.1.5 All All All
Operating System Arm Mbed Os 5.15.3 All All All
Operating System Arm Mbed Os 5.15.3 All All All

References

ReferenceSourceLinkTags
Bugfix/coap parser mem access bugs by mjurczak · Pull Request #116 · ARMmbed/mbed-coap · GitHub CONFIRM github.com Third Party Advisory
Implemented measures to prevent memory leaks in sn_coap_parser_option… · mjurczak/mbed-coap@4647a68 · GitHub MISC github.com Patch, Third Party Advisory
Memory leak in MbedOS CoAP library parser - sn_coap_parser_options_parse() · Issue #12957 · ARMmbed/mbed-os · GitHub MISC github.com Third Party Advisory
Integer overflow in MbedOS CoAP library parser · Issue #12930 · ARMmbed/mbed-os · GitHub MISC github.com Third Party Advisory
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