Assertion failure in check_certificate_request() of TinyDTLS

[Meng Ruijie <ruijie_meng () u nus edu>]

[Suggested description]
An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. An assertion failure in check_certificate_request() 
causes the server to exit unexpectedly (a denial of service).

[VulnerabilityType Other]
Improper Handling of exception conditions

[Vendor of Product]
https://github.com/contiki-ng/tinydtls

[Affected Product Code Base]
contiki-ng tinydtls - master branch 53a0d97

[Affected Component]
the service of dtls servers

[Attack Type]
Remote

[Impact Code execution]
true

[Impact Denial of Service]
true

[Impact Information Disclosure]
true

[Reference]
https://github.com/contiki-ng/tinydtls/issues/26

[Discoverer]
jerrytesting

[CVE Reference]
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2021-42145 to this 
vulnerability.
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