Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

        JSA11207 - 2021-07 Security Bulletin: Junos OS and Junos OS
            Evolved: Multiple vulnerabilities in cURL resolved
                               21 July 2021


        AusCERT Security Bulletin Summary

Product:           Junos OS
                   Junos OS Evolved
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
                   Reduced Security         -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-8286 CVE-2020-8285 CVE-2020-8284

Reference:         ASB-2021.0152

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

2021-07 Security Bulletin: Junos OS and Junos OS Evolved: Multiple vulnerabilities in cURL resolved

Article ID  : JSA11207
Last Updated: 20 Jul 2021
Version     : 3.0

Product Affected:
These issues affect all versions of Junos OS and Junos OS Evolved.

Multiple vulnerabilities have been resolved in Juniper Networks Junos OS and
Junos OS Evolved by updating cURL third party software. These vulnerabilities
may allow an attacker who tricks an administrator with access to the CLI to
reference a malicious URL, to expose information, or cause a Denial of Service
(DoS) condition.

This issue affects:

Juniper Networks Junos OS:

  o all versions prior to 15.1R7-S9;
  o 17.3 versions prior to 17.3R3-S12;
  o 17.4 versions prior to 17.4R3-S5;
  o 18.1 versions prior to 18.1R3-S13;
  o 18.2 version 18.2R1 and later versions;
  o 18.3 versions prior to 18.3R3-S5;
  o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
  o 19.1 versions prior to 19.1R3-S5;
  o 19.2 versions prior to 19.2R3-S2;
  o 19.3 versions prior to 19.3R2-S6, 19.3R3-S2;
  o 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3;
  o 20.1 versions prior to 20.1R2-S2, 20.1R3;
  o 20.2 versions prior to 20.2R2-S3, 20.2R3;
  o 20.3 versions prior to 20.3R2;
  o 20.4 versions prior to 20.4R1-S1, 20.4R2.

Juniper Networks Junos OS Evolved versions prior to 20.4R2-EVO.

This issue was discovered during external security research.

Security issues resolved include:

     CVE           CVSS                           Summary
                             A malicious server can use the FTP PASV response
              3.7 ( CVSS:3.1 to trick curl 7.73.0 and earlier into connecting
              /AV:N/AC:H/    back to a given IP address and port, and this way
CVE-2020-8284 PR:N/UI:N/S:U/ potentially make curl extract information about
              C:L/I:N/A:N )  services that are otherwise private and not
                             disclosed, for example doing port scanning and
                             service banner extractions.
              7.5 ( CVSS:3.1 curl 7.41.0 through 7.73.0 is vulnerable to an
CVE-2020-8286 /AV:N/AC:L/    improper check for certificate revocation due to
              PR:N/UI:N/S:U/ insufficient verification of the OCSP response.
              C:N/I:H/A:N )
              7.5 ( CVSS:3.1 curl 7.21.0 to and including 7.73.0 is vulnerable
CVE-2020-8285 /AV:N/AC:L/    to uncontrolled recursion due to a stack overflow
              PR:N/UI:N/S:U/ issue in FTP wildcard match parsing.
              C:N/I:N/A:H )


The following software releases have been updated to resolve these specific

Junos OS 15.1R7-S9, 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9*,
18.4R3-S9*, 19.1R3-S5, 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4,
19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R1-S1, 20.4R2,
21.1R1, and all subsequent releases.

Junos OS Evolved 20.4R2-EVO, 21.1R1-EVO, and all subsequent releases.

*Late availability

This issue is being tracked as 1575921 and 1562153 .

Use access lists or firewall filters to limit access to the device via CLI only
from trusted hosts and administrators.
Software releases or updates are available for download at https://
Modification History:

2021-07-14: Initial Publication.
2021-07-20: Updated PRODUCT AFFECTED field to match PROBLEM text.

CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
Severity Level:
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."

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967