Product Affected

This issue affects all versions of Junos OS and Junos OS Evolved on all platforms.
Medium
CVSS 3.1: 5.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H)
CVSS 4.0: 6.0 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L)

Problem

A Use After Free vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an authenticated, network-based attacker to cause a Denial of Service (DoS).
 

On all Junos OS and Junos Evolved platforms, if a routing-instance deactivation is triggered, and at the same time a specific SNMP request is received, a segmentation fault occurs which causes rpd to crash and restart.

 

This issue affects:

   Junos OS:

  • All versions before 21.2R3-S8, 
  • 21.4 versions before 21.4R3-S5,
  • 22.2 versions before 22.2R3-S3,
  • 22.3 versions before 22.3R3-S2,
  • 22.4 versions before 22.4R3,
  • 23.2 versions before 23.2R2.

 

  Junos OS Evolved:

  • All versions before 21.2R3-S8-EVO,
  • 21.4-EVO versions before 21.4R3-S5-EVO,
  • 22.2-EVO versions before 22.2R3-S3-EVO, 
  • 22.3-EVO versions before 22.3R3-S2-EVO,
  • 22.4-EVO versions before 22.4R3-EVO,
  • 23.2-EVO versions before 23.2R2-EVO.

 

To be exposed to this issue, the device needs to be configured for SNMP v2 or v3 with at least read access:

[ snmp community <name> ]

or

[ snmp v3 ... ]

 

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

This issue was seen during production usage.

Solution

The following software releases have been updated to resolve this specific issue:
Junos OS: 21.2R3-S8, 21.4R3-S5, 22.2R3-S3, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, and all subsequent releases.
Junos OS Evolved: 21.2R3-S8-EVO, 21.4R3-S5-EVO, 22.2R3-S3-EVO, 22.3R3-S2-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.
 

This issue is being tracked as 1740028 which is visible on the Customer Support website.
 

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

There are no known workarounds for this issue.

To reduce the risk of exploitation use access lists or firewall filters to limit access to the device only from trusted, administrative networks or hosts.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History

2024-07-10: Initial Publication
2024-09-13: Minor formatting change to CVSS field

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