Junos OS Evolved: MAC table changes cause a memory leak

Summary

An Uncontrolled Resource Consumption vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS). Certain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart. To identify the issue, execute the CLI command: user@device> show platform application-info allocations app l2ald-agent EVL Object Allocation Statistics: Node   Application     Context Name                               Live   Allocs   Fails     Guids re0   l2ald-agent               net::juniper::rtnh::L2Rtinfo       1069096 1069302   0         1069302 re0   l2ald-agent               net::juniper::rtnh::NHOpaqueTlv     114     195       0         195 This issue affects Junos OS Evolved: • All versions before 21.4R3-S8-EVO, • from 22.2-EVO before 22.2R3-S4-EVO, • from 22.3-EVO before 22.3R3-S3-EVO, • from 22.4-EVO before 22.4R3-EVO, • from 23.2-EVO before 23.2R2-EVO.

Timeline

1. Jul 10, 2024, 10:39 PM UTCCVE published
2. Jul 12, 2024, 8:01 PM UTCCISA SSVC assessment

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

3. Aug 2, 2024, 4:26 AM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS Evolved

  fixed in 21.4R3-S8-EVO; From 22.2-EVO · fixed in 22.2R3-S4-EVO; From 22.3-EVO · fixed in 22.3R3-S3-EVO; From 22.4-EVO · fixed in 22.4R3-EVO; From 23.2-EVO · fixed in 23.2R2-EVO

References 1