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2019-10 Security Bulletin: Junos OS: EX2300, EX3400 Series: Veriexec signature checking not enforced in specific versions of Junos OS (CVE-2019-0071)

  [JSA10978] Show Article Properties


Product Affected:
This issue affects Junos OS 18.1R3-S4, 18.3R1-S3. Affected platforms: EX2300, EX2300-C, EX3400.
Problem:

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.


This issue was found during internal product security testing or research.

This issue has been assigned CVE-2019-0071.
 

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.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
 

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.
 

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/.
 
Modification History:
  • 2019-10-09: Initial Publication.
Related Links:
CVSS Score:
7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."