-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2021.2435.3
 JSA11200 - 2021-07 Security Bulletin: Junos OS: Upon receipt of specific
 sequences of genuine packets destined to the device the kernel will crash
            and restart (vmcore) (CVE-2021-0283, CVE-2021-0284)
                              28 October 2021

===========================================================================

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

Product:           Junos OS
Publisher:         Juniper Networks
Operating System:  Juniper
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-0284 CVE-2021-0283 

Reference:         ESB-2021.2435.2

Original Bulletin: 
   http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11200

Revision History:  October 28 2021: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution
                   August  18 2021: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution sections to reflect these changes along with minor typographical edits.
                   July    20 2021: Initial Release

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

2021-07 Security Bulletin: Junos OS: Upon receipt of specific sequences of genuine packets destined to the device the kernel will crash and restart (vmcore) (CVE-2021-0283, CVE-2021-0284)

Article ID  : JSA11200
Last Updated: 27 Oct 2021
Version     : 8.0

Product Affected:
This issue affects Junos OS 12.3, 15.1, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4,
18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1,
21.2.
Problem:

A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos
OS allows an attacker to send specific sequences of packets to the device
thereby causing a Denial of Service (DoS).

By repeatedly sending these sequences of packets to the device, an attacker can
sustain the Denial of Service (DoS) condition.

The device will abnormally shut down as a result of these sent packets. A
potential indicator of compromise will be the following message in the log
files:

eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down

These issues are only triggered by traffic destined to the device. Transit
traffic will not trigger these issues.

CVE-2021-0283 affects:

Juniper Networks Junos OS

  o 12.3 versions prior to 12.3R12-S19;
  o 15.1 versions prior to 15.1R7-S10;
  o 16.1 version 16.1R1 and later versions;
  o 16.2 version 16.2R1 and later versions;
  o 17.1 version 17.1R1 and later versions;
  o 17.2 version 17.2R1 and later versions;
  o 17.3 versions prior to 17.3R3-S12;
  o 17.4 version 17.4R1 and later versions;
  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-S6;
  o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3;
  o 19.3 versions prior to 19.3R2-S7, 19.3R3-S3;
  o 19.4 versions prior to 19.4R3-S5;
  o 20.1 versions prior to 20.1R2-S2, 20.1R3-S1;
  o 20.2 versions prior to 20.2R3-S2;
  o 20.3 versions prior to 20.3R3;
  o 20.4 versions prior to 20.4R2-S1, 20.4R3;
  o 21.1 versions prior to 21.1R1-S1, 21.1R2;
  o 21.2 versions prior to 21.2R1-S1, 21.2R2.

CVE-2021-0284 affects:

Juniper Networks Junos OS

  o 12.3 versions prior to 12.3R12-S19;
  o 15.1 versions prior to 15.1R7-S10;
  o 17.3 versions prior to 17.3R3-S12;
  o 18.4 versions prior to 18.4R2-S9, 18.4R3-S9;
  o 19.1 versions prior to 19.1R3-S7;
  o 19.2 versions prior to 19.2R1-S7, 19.2R3-S3;
  o 19.3 versions prior to 19.3R2-S7, 19.3R3-S3;
  o 19.4 versions prior to 19.4R3-S5;
  o 20.1 versions prior to 20.1R3-S1;
  o 20.2 versions prior to 20.2R3-S2;
  o 20.3 versions prior to 20.3R3-S1;
  o 20.4 versions prior to 20.4R2-S2, 20.4R3;
  o 21.1 versions prior to 21.1R2;
  o 21.2 versions prior to 21.2R1-S1, 21.2R2.

CVE-2021-0283 was seen during production usage.

CVE-2021-0284 was found during internal product security testing or research.

Juniper SIRT is not aware of any malicious exploitation of either CVE-2021-0283
or CVE-2021-0284 vulnerabilities.

Juniper SIRT is aware of CVE-2021-0283 occurring in production. In all reported
cases the Junos device was not the intended target of the attack, but this
vulnerability was still triggered.

This issue was seen during production usage.

     CVE         CVSS                            Summary
                          A buffer overflow vulnerability in the TCP/IP stack
                          of Juniper Networks Junos OS allows an attacker to
                          send specific sequences of packets to the device
                          thereby causing a Denial of Service (DoS). By
              7.5 (       repeatedly sending these sequences of packets to the
              CVSS:3.1/   device, an attacker can sustain the Denial of Service
CVE-2021-0283 AV:N/AC:L/  (DoS) condition. The device will abnormally shut down
              PR:N/UI:N/  as a result of these sent packets. A potential
              S:U/C:N/I:N indicator of compromise will be the following message
              /A:H)       in the log files: "eventd[13955]:
                          SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut
                          down" This issue is only triggered by traffic
                          destined to the device. Transit traffic will not
                          trigger this issue.
                          A buffer overflow vulnerability in the TCP/IP stack
                          of Juniper Networks Junos OS allows an attacker to
                          send specific sequences of packets to the device
                          thereby causing a Denial of Service (DoS). By
              7.5 (       repeatedly sending these sequences of packets to the
              CVSS:3.1/   device, an attacker can sustain the Denial of Service
CVE-2021-0284 AV:N/AC:L/  (DoS) condition. The device will abnormally shut down
              PR:N/UI:N/  as a result of these sent packets. A potential
              S:U/C:N/I:N indicator of compromise will be the following message
              /A:H)       in the log files: "eventd[13955]:
                          SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut
                          down" This issue is only triggered by traffic
                          destined to the device. Transit traffic will not
                          trigger this issue.

Solution:

The following software releases have been updated to resolve both issues: Junos
OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.4R2-S9, 18.4R3-S9, 19.1R3-S7,
19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2,
20.3R3-S1, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all
subsequent releases.

The following software releases have been updated to resolve CVE-2021-0283:
Junos OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.1R3-S13, 18.3R3-S5,
18.4R2-S9, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3,
19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3,
21.1R1-S1, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all subsequent releases.

The following software releases have been updated to resolve CVE-2021-0284:
Junos OS: 12.3R12-S19, 15.1R7-S10, 17.3R3-S12, 18.4R2-S9, 18.4R3-S9, 19.1R3-S7,
19.2R1-S7, 19.2R3-S3, 19.3R2-S7, 19.3R3-S3, 19.4R3-S5, 20.1R3-S1, 20.2R3-S2,
20.3R3-S1, 20.4R2-S2, 20.4R3, 21.1R2, 21.2R1-S1, 21.2R2, 21.3R1, and all
subsequent releases.

These issues are being tracked as 1557881 and 1595649 .

Workaround:

There are no available workarounds for these issues.

To reduce the risk of exploitation of these issues, use access lists or
firewall filters to limit access to the device to only trusted administrative
networks, hosts and users.

Implementation:
Software releases or updates are available for download at https://
support.juniper.net/support/downloads/
Modification History:

2021-07-14: Initial Publication.
2021-07-21: Added additional versions to CVE-2021-0284 list in affected ranges and resolved-in.
2021-08-02: Added additional versions to CVE-2021-0284 list in affected ranges and resolved-in.
2021-08-17: Added additional versions to CVE-2021-0283, CVE-2021-0284, updated CVE detail text, product affected, problem and solution sections to reflect these changes along with minor typographical edits.
2021-10-27: Added additional versions to CVE-2021-0283, CVE-2021-0284.

CVSS Score:
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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."

- --------------------------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:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
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.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=GgP4
-----END PGP SIGNATURE-----