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AUSCERT External Security Bulletin Redistribution
ESB-2020.3736
JSA11080 - 2020-10 Security Bulletin: Junos OS: Memory leak leads to kernel
crash (vmcore) due to SNMP polling (CVE-2020-1683)
29 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-2020-1683
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11080
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2020-10 Security Bulletin: Junos OS: Memory leak leads to kernel crash (vmcore) due to SNMP polling (CVE-2020-1683)
Article ID : JSA11080
Last Updated: 28 Oct 2020
Version : 2.0
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 specific SNMP OID poll causes a memory
leak which over time leads to a kernel crash (vmcore).
Prior to the kernel crash other processes might be impacted, such as failure to
establish SSH connection to the device.
The administrator can monitor the output of the following command to check if
there is memory leak caused by this issue:
user@device> show system virtual-memory | match "pfe_ipc|kmem"
pfe_ipc 147 5K - 164352 16,32,64,8192 <-- increasing
vm.kmem_map_free: 127246336 <-- decreasing
pfe_ipc 0 0K - 18598 32,8192
vm.kmem_map_free: 134582272
This issue affects Juniper Networks Junos OS:
o 17.4R3;
o 18.1 version 18.1R3-S5 and later versions prior to 18.1R3-S10;
o 18.2 version 18.2R3 and later versions prior to 18.2R3-S3;
o 18.2X75 version 18.2X75-D420, 18.2X75-D50 and later versions prior to
18.2X75-D430, 18.2X75-D53, 18.2X75-D60;
o 18.3 version 18.3R3 and later versions prior to 18.3R3-S2;
o 18.4 version 18.4R1-S4, 18.4R2 and later versions prior to 18.4R2-S5,
18.4R3-S1;
o 19.1 version 19.1R2 and later versions prior to 19.1R2-S2, 19.1R3;
o 19.2 version 19.2R1 and later versions prior to 19.2R1-S5, 19.2R2;
o 19.3 versions prior to 19.3R2-S5, 19.3R3;
o 19.4 versions prior to 19.4R1-S3, 19.4R2.
This issue does not affect Juniper Networks Junos OS prior to 17.4R3.
The example of minimum config stanza affected by this issue:
[snmp]
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-2020-1683 .
Solution:
The following software releases have been updated to resolve this specific
issue: Junos OS 17.4R3-S1, 18.1R3-S10, 18.2R3-S3, 18.2X75-D41, 18.2X75-D430,
18.2X75-D53, 18.2X75-D60, 18.3R3-S2, 18.4R2-S5, 18.4R3-S1, 19.1R2-S2, 19.1R3,
19.2R1-S5, 19.2R2, 19.3R2-S5, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1, and all
subsequent releases.
This issue is being tracked as 1482379 .
Workaround:
Disable SNMP (disabled by default), utilize edge filtering with source-address
validation (uRPF, etc.), access control lists (ACLs), and/or SNMPv3
authentication to limit access to the device only from trusted hosts.
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:
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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