CVE-2020-17438

Severity Score

9.8

*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 reassembles fragmented packets fails to properly validate the total length of an incoming packet specified in its IP header, as well as the fragmentation offset value specified in the IP header. By crafting a packet with specific values of the IP header length and the fragmentation offset, attackers can write into the .bss section of the program (past the statically allocated buffer that is used for storing the fragmented data) and cause a denial of service in uip_reass() in uip.c, or possibly execute arbitrary code on some target architectures.

Se detectó un problema en uIP versión 1.0, como es usado en Contiki versión 3.0 y otros productos. El código que reensambla los paquetes fragmentados no comprueba correctamente la longitud total de un paquete entrante especificado en su encabezado IP, así como el valor de compensación de fragmentación especificado en el encabezado IP. Al diseñar un paquete con valores específicos de la longitud del encabezado IP y el desplazamiento de fragmentación, los atacantes pueden escribir en la sección .bss del programa (más allá del búfer asignado estáticamente que se usa para almacenar los datos fragmentados) y causar una Denegación de Servicio en la función uip_reass() en el archivo uip.c, o posiblemente ejecutar código arbitrario en algunas arquitecturas de destino

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

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
2024-04-15 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

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