Junos OS Evolved: Specific low privileged CLI commands and SNMP GET requests can trigger a resource leak #2

Summary

An Allocation of Resources Without Limits or Throttling vulnerability in the PFE management daemon (evo-pfemand) of Juniper Networks Junos OS Evolved allows an authenticated, network-based attacker to cause an FPC crash leading to a Denial of Service (DoS).When specific SNMP GET operations or specific low-priviledged CLI commands are executed, a GUID resource leak will occur, eventually leading to exhaustion and resulting in FPCs to hang. Affected FPCs need to be manually restarted to recover. GUID exhaustion will trigger a syslog message like one of the following: evo-pfemand[<pid>]: get_next_guid: Ran out of Guid Space ... evo-aftmand-zx[<pid>]: get_next_guid: Ran out of Guid Space ... The leak can be monitored by running the following command and taking note of the values in the rightmost column labeled Guids: user@host> show platform application-info allocations app evo-pfemand/evo-pfemand In case one or more of these values are constantly increasing the leak is happening. This issue affects Junos OS Evolved: • All versions before 21.2R3-S8-EVO, • 21.3 versions before 21.3R3-EVO; • 21.4 versions before 22.1R2-EVO, • 22.1 versions before 22.1R1-S1-EVO, 22.1R2-EVO. Please note that this issue is similar to, but different from CVE-2024-47505 and CVE-2024-47509.

Timeline

1. Oct 11, 2024, 3:35 PM UTCCVE published
2. Oct 11, 2024, 5:17 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 11, 2024, 5:18 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS Evolved

  From 21.2 · fixed in 21.2R3-S8-EVO; From 21.3 · fixed in 21.3R3-EVO; From 21.4 · fixed in 21.4R2-EVO,

References 1