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AUSCERT External Security Bulletin Redistribution
ESB-2020.3570
JSA11076 - 2020-10 Security Bulletin: Junos OS: PTX/QFX Series: Kernel
Routing Table (KRT) queue stuck after packet sampling a malformed packet
when the tunnel-observation mpls-over-udp configuration is
enabled. (CVE-2020-1679)
16 October 2020
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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-2020-1679
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11076
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2020-10 Security Bulletin: Junos OS: PTX/QFX Series: Kernel Routing Table (KRT) queue stuck after packet sampling a malformed packet when the tunnel-observation mpls-over-udp configuration is enabled. (CVE-2020-1679)
Article ID : JSA11076
Last Updated: 15 Oct 2020
Version : 3.0
Product Affected:
This issue affects Junos OS 17.2X75, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1,
19.2, 19.3, 19.4, 20.1. Affected platforms: PTX, QFX.
Problem:
On Juniper Networks PTX and QFX Series devices with packet sampling configured
using tunnel-observation mpls-over-udp , sampling of a malformed packet can
cause the Kernel Routing Table (KRT) queue to become stuck.
KRT is the module within the Routing Process Daemon (RPD) that synchronized the
routing tables with the forwarding tables in the kernel. This table is then
synchronized to the Packet Forwarding Engine (PFE) via the KRT queue. Thus,
when KRT queue become stuck, it can lead to unexpected packet forwarding
issues.
An administrator can monitor the following command to check if there is the KRT
queue is stuck:
user@device > show krt state
...
Number of async queue entries: 65007 tunnel-observation
mpls-over-udp]
or
[services flow-monitoring version-ipfix template
tunnel-observation mpls-over-udp]
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-2020-1679 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 17.2X75-D105, 18.1R3-S11, 18.2R3-S5, 18.2X75-D420, 18.2X75-D53,
18.2X75-D65, 18.3R2-S4, 18.3R3-S3, 18.4R1-S7, 18.4R2-S5, 18.4R3-S4, 19.1R2-S2,
19.1R3-S2, 19.2R1-S5, 19.2R3, 19.3R2-S3, 19.3R3, 19.4R1-S2, 19.4R2-S1, 19.4R3,
20.1R1-S2, 20.1R2, 20.2R1, 20.3X75-D10, and all subsequent releases.
This issue is being tracked as 1495788 .
Workaround:
Disable sampling on all the interfaces will prevent the issue from occurring.
If the device is experiencing the issue, the administrator can perform the
follow steps to restore KRT queue:
1. Disable sampling configuration on this FPC
user@device> deactivate chassis fpc sampling-instance
2. Restart multi-svcs process on this FPC by killing the process. The
multi-svcs will get stared automatically once it gets killed and resume normal
processing.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2020-10-14: Initial Publication.
2020-10-15: Update related to "tunnel-observation mpls-over-udp" configuration
requirement.
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."
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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