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2020-01 Security Bulletin: Junos OS: A specific SNMP command can trigger a high CPU usage Denial of Service in the RPD daemon. (CVE-2020-1600)

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Article ID: JSA10979 SECURITY_ADVISORIES Last Updated: 14 Feb 2020Version: 4.0
Product Affected:
This issue affects Junos OS 12.3X48, 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2.
Problem:

In a Point-to-Multipoint (P2MP) Label Switched Path (LSP) scenario, an uncontrolled resource consumption vulnerability in the Routing Protocol Daemon (RPD) in Juniper Networks Junos OS allows a specific SNMP request to trigger an infinite loop causing a high CPU usage Denial of Service (DoS) condition.

This issue affects both SNMP over IPv4 and IPv6.

This issue affects:

Juniper Networks Junos OS:

12.3X48 versions prior to 12.3X48-D90;

15.1 versions prior to 15.1R7-S6;

15.1X49 versions prior to 15.1X49-D200;

15.1X53 versions prior to 15.1X53-D238, 15.1X53-D592;

16.1 versions prior to 16.1R7-S5;

16.2 versions prior to 16.2R2-S11;

17.1 versions prior to 17.1R3-S1;

17.2 versions prior to 17.2R3-S2;

17.3 versions prior to 17.3R3-S7;

17.4 versions prior to 17.4R2-S4, 17.4R3;

18.1 versions prior to 18.1R3-S5;

18.2 versions prior to 18.2R3;

18.2X75 versions prior to 18.2X75-D50;

18.3 versions prior to 18.3R2;

18.4 versions prior to 18.4R1-S6, 18.4R2;

19.1 versions prior to 19.1R2.

The following minimal configuration is required. The community "public" is minimal; other communities are impacted as well.

[snmp community public]
[logical-systems logical-system-name protocols mpls label-switched-path lsp-name]
[protocols mpls label-switched-path]

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-2020-1600.

Solution:

The following software releases have been updated to resolve this specific issue: 12.3X48-D90, 15.1X49-D200, 15.1X53-D238, 15.1X53-D592, 16.1R7-S5, 16.2R2-S11, 17.1R3-S1, 17.2R3-S2, 17.3R3-S7, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R3, 18.2X75-D50, 18.3R2, 18.4R1-S6, 18.4R2, 19.1R2, 19.2R1, and all subsequent releases.

This issue is being tracked as 1402185.
 

Workaround:

If SNMP is not needed, remove SNMP from the system, otherwise, there are no available workarounds for this issue. SNMP is disabled by default.

Additional steps which may reduce the risk of exploitation include:

Utilizing 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, patches and updates are available at https://www.juniper.net/support/downloads/.
Modification History:
2020-01-08: Initial Publication.
2020-02-14: 15.1R7-S6 fixes were built for EX Series extended products; and released to the download pages.  This issue doesn't necessarily apply to EX Series devices, but does apply to other platforms.  Therefore, we've retained the Problem field affecting any releases prior to 15.1R7-S6, and removed the 15.1R7-S6 entry from the solution section.  The solution is available for applicable EX devices, and incorporated into those releases; even though it's effectively unrelated to those devices.  All other platforms using releases prior to 15.1R7-S6 should either upgrade, or replace their equipment with newer equipment and newer software. 
 
CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Severity Level:
Medium
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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