Product Affected

This issue affects Junos OS 21.4 22.2, 22.3, 22.4, 23.2, 23.4.
Medium

CVSS: v3.1: 6.7 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
CVSS: v4.0: 8.4 (CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/AU:Y/R:U/V:C/RE:L/U:Green)

Problem

A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the AgentD process of Juniper Networks Junos OS allows an attacker who is already causing impact to established sessions which generates counter changes picked up by the AgentD process during telemetry polling, to move the AgentD process into a state where AgentD attempts to reap an already destroyed sensor. This reaping attempt then leads to memory corruption causing the FPC to crash which is a Denial of Service (DoS).

The FPC will recover automatically without user intervention after the crash.

This issue affects Junos OS: 

  • All versions before 21.4R3-S9
  • From 22.2 before 22.2R3-S5,
  • From 22.3 before 22.3R3-S4,
  • From 22.4 before 22.4R3-S3,
  • From 23.2 before 23.2R2-S2,
  • From 23.4 before 23.4R2.

This issue does not affect Junos OS Evolved.

Required configuration for exposure:

The following minimal configuration is required for exposure: 
  [services analytics]

Solution

The following software releases have been updated to resolve this specific issue:
Junos OS: 21.4R3-S9, 22.2R3-S5, 22.3R3-S4, 22.4R3-S3, 23.2R2-S2, 23.4R2, 24.2R1, and all subsequent releases.

This issue is being tracked as 1769294 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.

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

2024-10-09: Initial Publication

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