A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). If an MX Series device receives PTP packets on an MPC3E that doesn't support PTP this causes a memory leak which will result in unpredictable behavior and ultimately in an MPC crash and restart. To monitor for this issue, please use the following FPC vty level commands: show heap shows an increase in "LAN buffer" utilization and show clksync ptp nbr-upd-info shows non-zero "Pending PFEs" counter. This issue affects Juniper Networks Junos OS on MX Series with MPC3E: * All versions earlier than 20.4R3-S3; * 21.1 versions earlier than 21.1R3-S4; * 21.
The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S3, 21.1R3-S4, 21.2R3, 21.3R2-S1, 21.3R3, 21.4R2, 22.1R2, 22.2R1, and all subsequent releases.
Although not a workaround the leaked memory can be recovered by: deactivate protocol ptp; commit; activate protocol ptp; commit.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | <20.4R3-S3 | 20.4R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=21.1<21.1R3-S4 | 21.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=21.2<21.2R3 | 21.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=21.3<21.3R2-S1, 21.3R3 | 21.3R2-S1, 21.3R3 | advisory ↗ |
| Juniper Networks Junos OS | >=21.4<21.4R2 | 21.4R2 | advisory ↗ |
| Juniper Networks Junos OS | >=22.1<22.1R2 | 22.1R2 | advisory ↗ |