CVE-2019-0071

Junos OS: EX2300, EX3400 Series: Veriexec signature checking not enforced in specific versions of Junos OS

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Veriexec is a kernel-based file integrity subsystem in Junos OS that ensures only authorized binaries are able to be executed. Due to a flaw in specific versions of Junos OS, affecting specific EX Series platforms, the Veriexec subsystem will fail to initialize, in essence disabling file integrity checking. This may allow a locally authenticated user with shell access to install untrusted executable images, and elevate privileges to gain full control of the system. During the installation of an affected version of Junos OS are installed, the following messages will be logged to the console: Initializing Verified Exec: /sbin/veriexec: Undefined symbol "__aeabi_uidiv" /sbin/veriexec: Undefined symbol "__aeabi_uidiv" /sbin/veriexec: Undefined symbol "__aeabi_uidiv" veriexec: /.mount/packages/db/os-kernel-prd-arm-32-20190221.70c2600_builder_stable_11/boot/brcm-hr3.dtb: Authentication error veriexec: /.mount/packages/db/os-kernel-prd-arm-32-20190221.70c2600_builder_stable_11/boot/contents.izo: Authentication error ... This issue affects Juniper Networks Junos OS: 18.1R3-S4 on EX2300, EX2300-C and EX3400; 18.3R1-S3 on EX2300, EX2300-C and EX3400.

Veriexec es un subsistema de integridad de archivos basado en el kernel en el sistema operativo Junos que asegura que solo puedan ser ejecutados los archivos binarios autorizados. Debido a un fallo en versiones específicas del sistema operativo Junos, que afecta a plataformas específicas de la Serie EX, el subsistema Veriexec no se inicializará, lo que esencialmente deshabilitará la comprobación de integridad de archivos. Esto puede permitir a un usuario autenticado localmente con acceso de shell instalar imágenes ejecutables no confiables y elevar los privilegios para conseguir el control total del sistema. Durante la instalación de una versión afectada del sistema operativo Junos, los siguientes mensajes se registrarán en la consola: Initializing Verified Exec: /sbin/veriexec: Undefined symbol "__aeabi_uidiv" /sbin/veriexec: Undefined symbol "__aeabi_uidiv" /sbin/veriexec: Undefined symbol "__aeabi_uidiv" veriexec: /.mount/packages/db/os-kernel-prd-arm-32-20190221.70c2600_builder_stable_11/boot/brcm-hr3.dtb: Authentication error veriexec: /.mount/packages/db/os-kernel-prd-arm-32-20190221.70c2600_builder_stable_11/boot/contents.izo: Authentication error ... Este problema afecta a Juniper Networks Junos OS: versión 18.1R3-S4 en EX2300, EX2300-C y EX3400; versión 18.3R1-S3 en EX2300, EX2300-C y EX3400.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-10-11 CVE Reserved
2019-10-09 CVE Published
2023-03-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature
CWE-354: Improper Validation of Integrity Check Value

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://kb.juniper.net/JSA10978	2020-09-29
https://www.juniper.net/documentation/en_US/junos/topics/concept/veriexec.html	2020-09-29

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.1 Search vendor "Juniper" for product "Junos" and version "18.1"	r3-s4	Affected	in	Juniper Search vendor "Juniper"	Ex2300 Search vendor "Juniper" for product "Ex2300"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.1 Search vendor "Juniper" for product "Junos" and version "18.1"	r3-s4	Affected	in	Juniper Search vendor "Juniper"	Ex2300-c Search vendor "Juniper" for product "Ex2300-c"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.1 Search vendor "Juniper" for product "Junos" and version "18.1"	r3-s4	Affected	in	Juniper Search vendor "Juniper"	Ex3400 Search vendor "Juniper" for product "Ex3400"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.3 Search vendor "Juniper" for product "Junos" and version "18.3"	r1-s3	Affected	in	Juniper Search vendor "Juniper"	Ex2300 Search vendor "Juniper" for product "Ex2300"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.3 Search vendor "Juniper" for product "Junos" and version "18.3"	r1-s3	Affected	in	Juniper Search vendor "Juniper"	Ex2300-c Search vendor "Juniper" for product "Ex2300-c"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.3 Search vendor "Juniper" for product "Junos" and version "18.3"	r1-s3	Affected	in	Juniper Search vendor "Juniper"	Ex3400 Search vendor "Juniper" for product "Ex3400"	-	-	Safe