CVE-2020-17440

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that domain names present in the DNS responses have '\0' termination. This results in errors when calculating the offset of the pointer that jumps over domain name bytes in DNS response packets when a name lacks this termination, and eventually leads to dereferencing the pointer at an invalid/arbitrary address, within newdata() and parse_name() in resolv.c.

Se detectó un problema en uIP versión 1.0, como es usado en Contiki versión 3.0 y otros productos. El código que analiza los paquetes DNS entrantes no comprueba a los nombres de dominio presentes en las respuestas DNS tener terminación "\0". Esto resulta en errores al calcular el desplazamiento del puntero que salta sobre los bytes del nombre de dominio en los paquetes de respuesta de DNS cuando un nombre carece de esta terminación, y eventualmente conlleva a una desreferencia del puntero a una dirección no válida y arbitraria, dentro de las funciones newdata() y parse_name() en el archivo resolv.c

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-07 CVE Reserved
2020-12-11 CVE Published
2023-08-27 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (2)

URL	Tag	Source
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01	Third Party Advisory
https://www.kb.cert.org/vuls/id/815128	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Uip Project Search vendor "Uip Project"	Uip Search vendor "Uip Project" for product "Uip"	1.0 Search vendor "Uip Project" for product "Uip" and version "1.0"	-	Affected	in	Contiki-os Search vendor "Contiki-os"	Contiki Search vendor "Contiki-os" for product "Contiki"	3.0 Search vendor "Contiki-os" for product "Contiki" and version "3.0"	-	Safe