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AUSCERT External Security Bulletin Redistribution
JSA11027 - 2020-07 Security Bulletin: Junos OS: A race condition on receipt
of crafted LLDP packets leads to a memory leak and an LLDP
9 July 2020
AusCERT Security Bulletin Summary
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2020-1641
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2020-07 Security Bulletin: Junos OS: A race condition on receipt of crafted LLDP packets leads to a memory leak and an LLDP crash. (CVE-2020-1641)
Article ID : JSA11027
Last Updated: 08 Jul 2020
Version : 1.0
This issue affects Junos OS 12.3, 12.3X48, 15.1, 15.1X49, 15.1X53, 16.1, 17.1,
17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1.
A Race Condition vulnerability in Juniper Networks Junos OS LLDP implementation
allows an attacker to cause LLDP to crash leading to a Denial of Service (DoS).
This issue occurs when crafted LLDP packets are received by the device from an
adjacent device. Multiple LACP flaps will occur after LLDP crashes.
An indicator of compromise is to evaluate log file details for lldp with
Intervention should occur before 85% threshold of used KB versus maximum
available KB memory is reached.
show log messages | match RLIMIT | match lldp | last 20
Matching statement is " /kernel: %KERNEL-[number]: Process ([pid #],lldpd) has
exceeded 85% of RLIMIT_DATA: " with  as variable data to evaluate for.
This issue affects:
Juniper Networks Junos OS:
12.3 versions prior to 12.3R12-S15;
12.3X48 versions prior to 12.3X48-D95;
15.1 versions prior to 15.1R7-S6;
15.1X49 versions prior to 15.1X49-D200;
15.1X53 versions prior to 15.1X53-D593;
16.1 versions prior to 16.1R7-S7;
17.1 versions prior to 17.1R2-S11, 17.1R3-S2;
17.2 versions prior to 17.2R1-S9, 17.2R3-S3;
17.3 versions prior to 17.3R2-S5, 17.3R3-S6;
17.4 versions prior to 17.4R2-S4, 17.4R3;
18.1 versions prior to 18.1R3-S5;
18.2 versions prior to 18.2R2-S7, 18.2R3;
18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420;
18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3;
18.4 versions prior to 18.4R1-S5, 18.4R2;
19.1 versions prior to 19.1R1-S4, 19.1R2.
The following minimal configuration is required:
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-2020-1641 .
The following software releases have been updated to resolve this specific
issue: 12.3R12-S15, 12.3X48-D95, 15.1R7-S6, 15.1X49-D200, 15.1X53-D593,
16.1R7-S7, 16.1R7-S7, 17.1R2-S11, 17.1R3-S2, 17.2R1-S9, 17.2R3-S3, 17.3R2-S5,
17.3R3-S6, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R2-S7, 18.2R3, 18.2X75-D33,
18.2X75-D50, 18.2X75-D420, 18.3R1-S7, 18.3R2-S3, 18.3R3, 18.4R1-S5, 18.4R2,
19.1R1-S4, 19.1R2, 19.2R1, and all subsequent releases.
This issue is being tracked as 1410239 .
Customers may disable LLDP "protocol lldp" or apply firewall filters to block
LLDP traffic on ingress interfaces.
There are no other known workarounds.
Software release Service Packages are available at http://support.juniper.net
from the "Download Software" links.
2020-07-08: Initial publication
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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