CVE-2021-21410

Out-of-bounds read in the 6LoWPAN implementation

Severity Score

9.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.

Contiki-NG es un sistema operativo de código abierto y multiplataforma para dispositivos IoT de próxima generación. Una lectura fuera de límites puede ser desencadenada por los paquetes 6LoWPAN enviados a dispositivos que ejecutan Contiki-NG versiones 4.6 y anteriores. La función de descompresión de encabezados IPv6 ((code)uncompress_hdr_iphc(/code)) no lleva a cabo comprobaciones de límites apropiadas al leer del búfer del paquete. Por lo tanto, es posible construir un paquete 6LoWPAN comprimido que leerá más bytes de los que están disponibles en el búfer del paquete. En el momento de la publicación, no se presenta una versión con un parche disponible. Los usuarios pueden aplicar el parche para esta vulnerabilidad fuera de límite como solución alternativa

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-06-18 CVE Published
2024-03-03 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/contiki-ng/contiki-ng/pull/1482	2021-06-24
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-hhwj-2p59-v8p9	2021-06-24

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Contiki-ng Search vendor "Contiki-ng"		Contiki-ng Search vendor "Contiki-ng" for product "Contiki-ng"				<= 4.6 Search vendor "Contiki-ng" for product "Contiki-ng" and version " <= 4.6"		-		Affected