Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.2496
Security Bulletin: Junos OS: Kernel crash (vmcore) or FPC
crash due to mbuf leak (CVE-2020-1653)
22 July 2020
===========================================================================
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-2020-1653
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11040
- --------------------------BEGIN INCLUDED TEXT--------------------
2020-07 Security Bulletin: Junos OS: Kernel crash (vmcore) or FPC crash due to
mbuf leak (CVE-2020-1653)
Article ID : JSA11040
Last Updated: 21 Jul 2020
Version : 3.0
Product Affected:
This issue affects Junos OS 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2,
19.3, 19.4.
Problem:
On Juniper Networks Junos OS devices, a stream of TCP packets sent to the
Routing Engine (RE) may cause mbuf leak which can lead to Flexible PIC
Concentrator (FPC) crash or the system to crash and restart (vmcore).
This issue can be trigged by IPv4 or IPv6 and it is caused only by TCP packets.
This issue is not related to any specific configuration and it affects Junos OS
releases starting from 17.4R1.
However, this issue does not affect Junos OS releases prior to 18.2R1 when
Nonstop active routing (NSR) is configured [edit routing-options
nonstop-routing] .
The number of mbufs is platform dependent.
The following command provides the number of mbufs counter that are currently
in use and maximum number of mbufs that can be allocated on a platform:
user@host> show system buffers
2437/3143/5580 mbufs in use (current/cache/total)
Once the device runs out of mbufs, the FPC crashes or the vmcore occurs and the
device might become inaccessible requiring a manual restart.
This issue affects Juniper Networks Junos OS
17.4 versions prior to 17.4R2-S11, 17.4R3-S2;
18.1 versions prior to 18.1R3-S10;
18.2 versions prior to 18.2R2-S7, 18.2R3-S5;
18.2X75 versions prior to 18.2X75-D41, 18.2X75-D420.12, 18.2X75-D51,
18.2X75-D60, 18.2X75-D34;
18.3 versions prior to 18.3R2-S4, 18.3R3-S2;
18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S1;
19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3;
19.2 versions prior to 19.2R1-S5, 19.2R2;
19.3 versions prior to 19.3R2-S3, 19.3R3;
19.4 versions prior to 19.4R1-S2, 19.4R2.
Versions of Junos OS prior to 17.4R1 are unaffected by this vulnerability.
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-2020-1653 .
Solution:
The following software releases have been updated to resolve this specific
issue: 17.4R2-S11, 17.4R3-S2, 18.1R3-S10, 18.2R2-S7, 18.2R3-S5, 18.2X75-D41,
18.2X75-D420.12, 18.2X75-D51, 18.2X75-D60, 18.2X75-D34, 18.3R2-S4, 18.3R3-S2,
18.4R1-S7, 18.4R2-S4, 18.4R3-S1, 19.1R1-S5, 19.1R2-S1, 19.1R3, 19.2R1-S5,
19.2R2, 19.3R2-S3, 19.3R3, 19.4R1-S2, 19.4R2, 20.1R1, and all subsequent
releases.
This issue is being tracked as 1468183 .
Workaround:
There are no viable workarounds for this issue, however having the DDoS feature
enabled and using the firewall filter to limit incoming packet towards the RE
only from trusted networks and host help to mitigate this issue.
The following command can be used to check if DDoS feature is enabled:
user@host> show ddos-protection statistics
DDOS protection global statistics:
Policing on routing engine: Yes <--- must be "Yes"
Policing on FPC: Yes
<snip>
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2020-07-08: Initial publication
2020-07-21: Adding the PR reference
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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=hWTD
-----END PGP SIGNATURE-----