ESB-2019.1304 - [Juniper] Junos OS: Multiple vulnerabilities 2019-04-16

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1304
         JSA10937 - 2019-04 Security Bulletin: Junos OS: Multiple
                FreeBSD vulnerabilities fixed in Junos OS.
                               16 April 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6924 CVE-2018-3646 CVE-2018-3620

Reference:         ASB-2019.0029
                   ASB-2018.0204
                   ESB-2019.0726
                   ESB-2018.2754

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10937

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2019-04 Security Bulletin: Junos OS: Multiple FreeBSD vulnerabilities fixed in Junos OS.

Article ID:   JSA10937

Last Updated: 12 Apr 2019

Version:      4.0

Product Affected:
Junos OS
Problem:

Multiple vulnerabilities that affect FreeBSD have been fixed in Junos OS.

Most Juniper devices are deployed in a manner that will offer multiple layers
of protection against successful exploit of these issues.

Limiting access to critical infrastructure networking equipment to only trusted
administrators from trusted administrative networks or hosts will prevent
untrusted code execution, which is required for successful exploitation of
these vulnerabilities.

Junos OS can only execute code signed by Juniper (e.g. veriexec code-signing
validation in Junos OS). This ensures that only code signed by Juniper can be
executed on the device. Administrators can check whether veriexec is enforced
by running the following command from the Junos OS shell:

% sysctl security.mac.veriexec.state

if veriexec is enforced, the output should be:

security.mac.veriexec.state: loaded active enforce

Additionally, on the platforms where veriexec is not enforced, the ability to
load or execute code is limited only to privilege users.

Note: on older Junos OS versions, the above command might give a different
result, on these releases the alternative command is:

/sbin/veriexec -i enforce

the exit status will be 0 (true) if it is being enforced.

If veriexec is enforced:

% /sbin/veriexec -i enforce || echo "ERROR: veriexec not enforced"
%

if veriexec is not enforced:

% /sbin/veriexec -i enforce || echo "ERROR: veriexec not enforced"
ERROR: veriexec not enforced
%

The vulnerabilities fixed include:

     CVE           CVSS                            Summary
                              Systems with microprocessors utilizing
              5.6 ( CVSS:3.0/ speculative execution and address translations
CVE-2018-3620 AV:L/AC:H/PR:L/ may allow unauthorized disclosure of information
              UI:N/S:C/C:H/   residing in the L1 data cache to an attacker with
              I:N/A:N )       local user access via a terminal page fault and a
                              side-channel analysis.
                              Systems with microprocessors utilizing
              5.6 ( CVSS:3.0/ speculative execution and address translations
CVE-2018-3646 AV:L/AC:H/PR:L/ may allow unauthorized disclosure of information
              UI:N/S:C/C:H/   residing in the L1 data cache to an attacker with
              I:N/A:N )       local user access with guest OS privilege via a
                              terminal page fault and a side-channel analysis.
              7.1 ( CVSS:3.0/ Insufficient validation in the ELF header parser
CVE-2018-6924 AV:L/AC:L/PR:L/ could allow a malicious ELF binary to cause a
              UI:N/S:U/C:H/   kernel crash or disclose kernel memory.
              I:N/A:H )

Solution:

CVE-2018-6924 has been resolved in Junos OS 15.1F6-S12, 15.1R7-S3,
15.1X53-D237, 16.1R3-S10, 16.1R6-S6, 16.1R7-S3, 16.1X9, 16.2R2-S8, 17.1R2-S10,
17.1R3, 17.2R1-S8, 17.2R3-S1, 17.2X75-D105, 17.3R3-S4, 17.4R1-S6, 17.4R2-S2,
17.4X5, 18.1R2-S4, 18.1R3-S3, 18.2X41, 18.2X5, 18.3R1-S2, 18.3R2, 18.4R1,
18.4X1 and all subsequent releases (PR 1387416 ).

CVE-2018-3620, CVE-2018-3646 have been resolved in Junos OS 17.4R1-S6,
17.4R2-S2, 17.4X5, 18.1R2-S4, 18.1R3-S3, 18.2X41, 18.2X5, 18.3R1-S2, 18.3R2,
18.4R1, 18.4X1 and all subsequent releases (PR 1381696 )

These issues are being tracked as PR 1381696 and 1387416 which are visible on
the Customer Support website.

Workaround:

Limiting access to critical infrastructure networking equipment to only trusted
administrators from trusted administrative networks or hosts will prevent
untrusted code execution, hence prevent exploitation of these vulnerabilities.

Implementation:
Software Releases, patches and updates are available at https://www.juniper.net
/support/downloads/ .

Modification History:

  o 2019-04-10: Initial Publication.

Related Links:

  o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
    Publication Process.

  o KB16765: In which releases are vulnerabilities fixed

  o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
    Advisories

  o Report a Security Vulnerability - How to Contact the Juniper Networks
    Security Incident Response Team

CVSS Score:
7.1 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)

Risk Level:
High

Risk Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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