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2022-01 Security Bulletin: Junos OS and Junos OS Evolved: After receiving a specific number of crafted packets snmpd will segmentation fault (SIGSEGV) requiring a manual restart. (CVE-2022-22177)

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Article ID: JSA11283 SECURITY_ADVISORIES Last Updated: 13 Jan 2022Version: 3.0
Product Affected:
This issue affects Junos OS 12.3, 15.1, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2. This issue affects any Junos OS Evolved releases prior to 21.2R3-EVO, 21.3.
Problem:
A release of illegal memory vulnerability in the snmpd daemon of Juniper Networks Junos OS, Junos OS Evolved allows an attacker to halt the snmpd daemon causing a sustained Denial of Service (DoS) to the service until it is manually restarted.

This issue impacts any version of SNMP – v1,v2, v3

This issue affects:
Juniper Networks Junos OS
  • 12.3 versions prior to 12.3R12-S20;
  • 15.1 versions prior to 15.1R7-S11;
  • 18.3 versions prior to 18.3R3-S6;
  • 18.4 versions prior to 18.4R2-S9, 18.4R3-S10;
  • 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
  • 19.2 versions prior to 19.2R1-S8, 19.2R3-S4;
  • 19.3 versions prior to 19.3R3-S4;
  • 19.4 versions prior to 19.4R2-S5, 19.4R3-S6;
  • 20.1 versions prior to 20.1R3-S2;
  • 20.2 versions prior to 20.2R3-S3;
  • 20.3 versions prior to 20.3R3-S1;
  • 20.4 versions prior to 20.4R3;
  • 21.1 versions prior to 21.1R2-S2, 21.1R3;
  • 21.2 versions prior to 21.2R1-S2, 21.2R2.
Juniper Networks Junos OS Evolved
  • 21.2 versions prior to 21.2R3-EVO;
  • 21.3 versions prior to 21.3R2-EVO.
The following minimal configuration is needed:
[snmp community 'community-name"] using a Read Write (RW) Community

Read Only (RO) communities are not impacted by this issue.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was discovered during external security research.

This issue has been assigned CVE-2022-22177.

Solution:

The following software releases have been updated to resolve this specific issue:

Junos OS: 12.3R12-S20, 15.1R7-S11, 18.3R3-S6, 18.4R2-S9, 18.4R3-S10, 19.1R2-S3, 19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4, 19.4R2-S5, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R2-S2, 21.1R3, 21.2R1-S2, 21.2R2, 21.3R1, and all subsequent releases.

Junos OS Evolved: 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1613874.

Workaround:

There are no workarounds for this issue.

For V1, V2 you can reduce the risk of exploitation by configuring the client-list to limit access to network management system (NMS) machines.

See the Network Management and Monitoring Guide for further instructions.

example:

[snmp client-list client-list-name "ip-addresses";]

For V3 you can reduce the risk of exploitation by configuring SNMP security to trusted devices only.

For any release of SNMP you can reduce the risk of exploitation by implementing source and destination IP filter rules as well as using Read Only communities where possible.

Regardless of these risk reduction methods, an attacker able to spoof trusted IP addresses can send the attack to an exposed and reachable SNMP RW community.

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/.
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
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."
Acknowledgements:
Nanyu Zhong and Yu Zhang of VARAS at the Institute of Information Engineering

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