CVE-2020-12883

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Summary

CVECVE-2020-12883
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
DescriptionBuffer 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.

Risk And Classification

Problem Types: CWE-125

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Arm Mbed Os 5.15.3 All All All
Operating System Arm Mbed Os 5.15.3 All All All

References

ReferenceSourceLinkTags
Out of range memory access in MbedOS CoAP library parser - option number · Issue #12926 · ARMmbed/mbed-os · GitHub MISC github.com Third Party Advisory
Bugfix/coap parser mem access bugs by mjurczak · Pull Request #116 · ARMmbed/mbed-coap · GitHub CONFIRM github.com Third Party Advisory
Out of range memory access in MbedOS CoAP library parser - option value length · Issue #12927 · ARMmbed/mbed-os · GitHub MISC github.com Third Party Advisory
Out of range memory access in MbedOS CoAP library parser · Issue #12925 · ARMmbed/mbed-os · GitHub MISC github.com Third Party Advisory
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