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Contiki-NG tinyDTLS Epoch Number Reuse

Contiki-NG tinyDTLS Epoch Number Reuse
Posted Jan 18, 2024
Authored by jerrytesting

An issue was discovered in Contiki-NG tinyDTLS versions through 2018-08-30. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).

tags | advisory, remote, tcp
advisories | CVE-2021-42146
SHA-256 | db8a0bf96f7883a8a21b7027f42157c985e59fe2bbc26de4705dacefa635eccf

Contiki-NG tinyDTLS Epoch Number Reuse

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[Suggested description]
An issue was discovered in Contiki-NG tinyDTLS through 2018-08-30. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).

[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 Information Disclosure]
true

[Reference]
https://github.com/contiki-ng/tinydtls/issues/25

[Discoverer]
jerrytesting

[CVE Reference]
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2021-42146 to this vulnerability.

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