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AUSCERT External Security Bulletin Redistribution
ESB-2021.0176
JSA11098 and JSA11101- 2021-01 Security Bulletins: Junos OS
and Junos OS Evolved
15 January 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0211 CVE-2021-0208
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11098
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11101
Comment: This bulletin contains two (2) Juniper Networks security advisories.
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2021-01 Security Bulletin: Junos OS and Junos OS Evolved: In bidirectional LSP configurations, on MPLS egress router RPD may core upon receipt of specific malformed RSVP packet. (CVE-2021-0208)
Article ID : JSA11098
Last Updated: 13 Jan 2021
Version : 4.0
Product Affected:
This issue affects Junos OS 15.1X49, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1,
19.2, 19.3, 19.4, 20.1. This issue affects Junos OS Evolved 19.3, 19.4, 20.1.
Problem:
An improper input validation vulnerability in the Routing Protocol Daemon (RPD)
service of Juniper Networks Junos OS allows an attacker to send a malformed
RSVP packet when bidirectional LSPs are in use, which when received by an
egress router crashes the RPD causing a Denial of Service (DoS) condition.
Continued receipt of the packet will sustain the Denial of Service.
This issue affects:
Juniper Networks Junos OS:
o All versions prior to 17.3R3-S10 except 15.1X49-D240 for SRX series;
o 17.4 versions prior to 17.4R3-S2;
o 18.1 versions prior to 18.1R3-S10;
o 18.2 versions prior to 18.2R2-S7, 18.2R3-S4;
o 18.3 versions prior to 18.3R3-S2;
o 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S2;
o 19.1 versions prior to 19.1R1-S5, 19.1R3-S3;
o 19.2 versions prior to 19.2R3;
o 19.3 versions prior to 19.3R2-S5, 19.3R3;
o 19.4 versions prior to 19.4R2-S2, 19.4R3-S1;
o 20.1 versions prior to 20.1R1-S4, 20.1R2;
o 15.1X49 versions prior to 15.1X49-D240 on SRX Series.
Juniper Networks Junos OS Evolved:
o 19.3 versions prior to 19.3R2-S5-EVO;
o 19.4 versions prior to 19.4R2-S2-EVO;
o 20.1 versions prior to 20.1R1-S4-EVO.
The following are examples of minimal configurations:
[protocols mpls label-switched-path <lsp-name> corouted-bidirectional;]
or
[logical-systems <logical-system-name> protocols mpls label-switched-path
<lsp-name> corouted-bidirectional;]
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-2021-0208 .
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 15.1X49-D240, 17.3R3-S10, 17.4R3-S2, 18.1R3-S10, 18.2R2-S7,
18.2R3-S4, 18.3R3-S2, 18.4R1-S8, 18.4R2-S6, 18.4R3-S2, 19.1R1-S5, 19.1R3-S3,
19.2R3, 19.3R2-S5, 19.3R3, 19.4R2-S2, 19.4R3-S1, 20.1R1-S4, 20.1R2, 20.2R1, and
all subsequent releases.
Note: With the exception of SRX Series products using version 15.1X49-D240, all
products using Junos OS prior to 17.3R3-S10 are affected and will not be fixed
by Juniper Networks, Inc.
Junos OS Evolved: 19.3R2-S5-EVO, 19.4R2-S2-EVO, 20.1R1-S4-EVO, and all
subsequent releases.
This issue is being tracked as 1493718 .
Workaround:
If bidirectional LSPs are running in the network, when changing family mpls
maximum-labels on an interface, first disable RSVP for this interface.
You can include the disable statement at the following hierarchy levels:
[edit protocols rsvp interface interface-name ]
[edit logical-systems logical-system-name protocols rsvp interface
interface-name ]
See the MPLS RSVP disable configuration guide for further details.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2021-01-13: Initial Publication.
CVSS Score:
8.8 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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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2021-01 Security Bulletin: Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted. (CVE-2021-0211)
Article ID : JSA11101
Last Updated: 13 Jan 2021
Version : 3.0
Product Affected:
This issue affects Junos OS 15.1, 15.1X49, 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. This issue affects Junos OS Evolved
20.3.
Problem:
An improper check for unusual or exceptional conditions in Juniper Networks
Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an
attacker to send a valid BGP FlowSpec message thereby causing an unexpected
change in the route advertisements within the BGP FlowSpec domain leading to
disruptions in network traffic causing a Denial of Service (DoS) condition.
Continued receipt of these update messages will cause a sustained Denial of
Service condition.
This issue affects Juniper Networks:
Junos OS:
o All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX
Series and 15.1R7-S8 on EX Series;
o 17.4 versions prior to 17.4R2-S12, 17.4R3-S4;
o 18.1 versions prior to 18.1R3-S12;
o 18.2 versions prior to 18.2R2-S8, 18.2R3-S6;
o 18.3 versions prior to 18.3R3-S4;
o 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6;
o 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3;
o 19.2 versions prior to 19.2R3-S1;
o 19.3 versions prior to 19.3R2-S5, 19.3R3-S1;
o 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3;
o 20.1 versions prior to 20.1R2;
o 20.2 versions prior to 20.2R1-S3 20.2R2;
o 20.3 versions prior to 20.3R1-S1, 20.3R2.
Junos OS Evolved:
o All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO.
The following minimal configuration is required to potentially hit this issue:
protocols bgp family inet flow
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-2021-0211 .
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 15.1R7-S8, 15.1X49-D240, 17.3R3-S10, 17.4R2-S12, 17.4R3-S4,
18.1R3-S12, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6,
19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R1-S3, 19.4R2-S3,
19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all
subsequent releases.
Junos OS Evolved: 20.3R1-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent
releases.
This issue is being tracked as 1539109 .
Workaround:
There are no viable workarounds for this issue.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2021-01-13: Initial Publication.
2021-01-13: Added 15.1R7-S8 as fix point for EX Series which are affected.
CVSS Score:
10.0 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H)
Severity Level:
Critical
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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