Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.1288
JSA11140 - 2021-04 Security Bulletin: Junos OS: PTX Series, QFX Series: Due
to a race condition input loopback firewall filters applied to interfaces
may not operate even when listed in the running configuration.
16 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS: PTX Series
Junos OS: QFX Series
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0247
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11140
- --------------------------BEGIN INCLUDED TEXT--------------------
2021-04 Security Bulletin: Junos OS: PTX Series, QFX Series: Due to a race condition
input loopback firewall filters applied to interfaces may not operate even when listed
in the running configuration. (CVE-2021-0247)
Article ID : JSA11140
Last Updated: 15 Apr 2021
Version : 2.0
Product Affected:
This issue affects Junos OS 14.1, 14.1X53, 15.1, 15.1X53, 16.1, 16.2, 17.1,
17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2. Affected platforms: PTX
Series, QFX Series.
Problem:
A Race Condition (Concurrent Execution using Shared Resource with Improper
Synchronization) vulnerability in the firewall process (dfwd) of Juniper
Networks Junos OS allows an attacker to bypass the firewall rule sets applied
to the input loopback filter on any interfaces of a device.
This issue is detectable by reviewing the PFE firewall rules, as well as the
firewall counters and seeing if they are incrementing or not.
For example:
show firewall
Filter: __default_bpdu_filter__
Filter: FILTER-INET-01
Counters:
Name Bytes Packets
output-match-inet 0 0 <<<<<< missing firewall packet count
This issue affects:
Juniper Networks Junos OS:
o 14.1X53 versions prior to 14.1X53-D53 on QFX Series;
o 14.1 versions 14.1R1 and later versions prior to 15.1 versions prior to
15.1R7-S6 on QFX Series, PTX Series;
o 15.1X53 versions prior to 15.1X53-D593 on QFX Series;
o 16.1 versions prior to 16.1R7-S7 on QFX Series, PTX Series;
o 16.2 versions prior to 16.2R2-S11, 16.2R3 on QFX Series, PTX Series;
o 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on QFX Series, PTX Series;
o 17.2 versions prior to 17.2R1-S9, 17.2R3-S3 on QFX Series, PTX Series;
o 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on QFX Series, PTX Series;
o 17.4 versions prior to 17.4R2-S9, 17.4R3 on QFX Series, PTX Series;
o 18.1 versions prior to 18.1R3-S9 on QFX Series, PTX Series;
o 18.2 versions prior to 18.2R2-S6, 18.2R3-S3 on QFX Series, PTX Series;
o 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1 on QFX Series, PTX
Series;
o 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3 on QFX Series, PTX
Series;
o 19.1 versions prior to 19.1R1-S4, 19.1R2-S1, 19.1R3 on QFX Series, PTX
Series;
o 19.2 versions prior to 19.2R1-S3, 19.2R2 on QFX Series, PTX Series.
This issue impact all filters families (inet, inet6, etc.) yet only on input
loopback filters.
It does not does not rely upon the location where a filter is set, impacting
both logical and physical interfaces.
Configuration examples for input filtering are posted on the support site and
in product documentation.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2021-0247 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 14.1X53-D53, 15.1R7-S6, 15.1X53-D593, 16.1R7-S7, 16.2R2-S11,
16.2R3, 17.1R2-S11, 17.1R3-S2, 17.2R1-S9, 17.2R3-S3, 17.3R2-S5, 17.3R3-S7,
17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R2-S6, 18.2R3-S3, 18.3R1-S7, 18.3R2-S3,
18.3R3-S1, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2-S1, 19.1R3,
19.2R1-S3, 19.2R2, 19.3R1, and all subsequent releases.
This issue is being tracked as 1430385 .
Workaround:
There are no viable workarounds for this issue.
Implementation:
Software releases or updates are available for download at https://
support.juniper.net/support/downloads/
Modification History:
2021-04-14: Initial Publication.
2021-04-15: Removed spurious 18.4R2-S7 release entry in problem description.
CVSS Score:
5.1 (CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L)
Severity Level:
Medium
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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=x5yL
-----END PGP SIGNATURE-----