CVE-2019-0071 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://kb.juniper.net/JSA10978 https://www.juniper.net/documentation/en_US/junos/topics/concept/veriexec.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8