Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.3564
JSA11053 - 2020-10 Security Bulletin: Junos OS: NFX Series:
Multiple vulnerabilities resolved in 20.2R1 release
16 October 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
NFX Series
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-11479 CVE-2019-11478 CVE-2019-11477
CVE-2019-5599
Reference: ASB-2020.0017
ASB-2019.0178.3
ESB-2020.0262
ESB-2019.3732
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11053
- --------------------------BEGIN INCLUDED TEXT--------------------
2020-10 Security Bulletin: Junos OS: NFX Series: Multiple vulnerabilities
resolved in 20.2R1 release
Article ID : JSA11053
Last Updated: 14 Oct 2020
Version : 1.0
Product Affected:
This issue affects Junos OS versions prior to 20.2R1. Affected platforms: NFX
Series.
Problem:
Multiple vulnerabilities have been resolved in Juniper Networks NFX Series by
updating third party software included with NFX Series devices.
These issues affect:
Juniper Networks NFX Series Network Services Platform versions prior to 20.2R1.
This issue is also known as SACK Panic, SACK Slowness.
Important security issues resolved include:
CVE CVSS Summary
7.5 ( A bug in the non-default RACK TCP stack can allow
CVSS:3.0/ an attacker to cause several linked lists to grow
CVE-2019-5599 AV:N/AC:L/ unbounded and cause an expensive list traversal on
PR:N/UI:N/ every packet being processed, leading to resource
S:U/C:N/I:N/ exhaustion and a denial of service.
A:H )
Jonathan Looney discovered that the TCP_SKB_CB(skb)
7.5 ( ->tcp_gso_segs value was subject to an integer
CVSS:3.0/ overflow in the Linux kernel when handling TCP
AV:N/AC:L/ Selective Acknowledgments (SACKs). A remote
CVE-2019-11477 PR:N/UI:N/ attacker could use this to cause a denial of
S:U/C:N/I:N/ service. This has been fixed in stable kernel
A:H ) releases 4.4.182, 4.9.182, 4.14.127, 4.19.52,
5.1.11, and is fixed in commit
3b4929f65b0d8249f19a50245cd88ed1a2f78cff.
Jonathan Looney discovered that the TCP
7.5 ( retransmission queue implementation in tcp_fragment
CVSS:3.0/ in the Linux kernel could be fragmented when
AV:N/AC:L/ handling certain TCP Selective Acknowledgment
CVE-2019-11478 PR:N/UI:N/ (SACK) sequences. A remote attacker could use this
S:U/C:N/I:N/ to cause a denial of service. This has been fixed
A:H ) in stable kernel releases 4.4.182, 4.9.182,
4.14.127, 4.19.52, 5.1.11, and is fixed in commit
f070ef2ac66716357066b683fb0baf55f8191a2e.
Jonathan Looney discovered that the Linux kernel
default MSS is hard-coded to 48 bytes. This allows
7.5 ( a remote peer to fragment TCP resend queues
CVSS:3.0/ significantly more than if a larger MSS were
CVE-2019-11479 AV:N/AC:L/ enforced. A remote attacker could use this to cause
PR:N/UI:N/ a denial of service. This has been fixed in stable
S:U/C:N/I:N/ kernel releases 4.4.182, 4.9.182, 4.14.127,
A:H ) 4.19.52, 5.1.11, and is fixed in commits
967c05aee439e6e5d7d805e195b3a20ef5c433d6 and
5f3e2bf008c2221478101ee72f5cb4654b9fc363.
Solution:
The following software releases have been updated to resolve these specific
issues: NFX Series: 20.2R1 and all subsequent releases.
This issue is being tracked as 1444420 .
Workaround:
There are no known workarounds for these issues.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2020-10-14: Initial Publication.
CVSS Score:
8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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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=SLYp
-----END PGP SIGNATURE-----