CVE-2019-0071

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

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.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: Junos OS: 18.1R3-S5, 18.3R1-S4, and all subsequent releases.

Workaround:

  • To reduce the risk of exploitation of this vulnerability, customers should limit access to the Junos shell to only trusted administrators. However, Juniper Networks strongly recommends upgrading to an updated release of Junos OS to resolve this issue.

Categories

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.01%
Vendor Advisory juniper.net Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2019-0071?
CVE-2019-0071 has been scored as a high severity vulnerability.
How to fix CVE-2019-0071?
To fix CVE-2019-0071: The following software releases have been updated to resolve this specific issue: Junos OS: 18.1R3-S5, 18.3R1-S4, and all subsequent releases.
Is CVE-2019-0071 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-0071 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-0071?
CVE-2019-0071 affects Juniper Networks Junos OS.
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