A Missing Release of Memory after Effective Lifetime vulnerability in the BroadBand Edge subscriber management daemon (bbe-smgd) of Juniper Networks Junos OS on MX Series allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).

If the authentication packet-type option is configured and a received packet does not match that packet type, the memory leak occurs. When all memory available to bbe-smgd has been consumed, no new subscribers will be able to login.

The memory utilization of bbe-smgd can be monitored with the following show command:

user@host> show system processes extensive | match bbe-smgd

The below log message can be observed when this limit has been reached:

bbesmgd[<PID>]: %DAEMON-3-SMD_DPROF_RSMON_ERROR: Resource unavailability, Reason: Daemon Heap Memory exhaustion


This issue affects Junos OS on MX Series:

• all versions before 22.4R3-S8,
• 23.2 versions before 23.2R2-S5,
• 23.4 versions before 23.4R2-S6,
• 24.2 versions before 24.2R2-S2,
• 24.4 versions before 24.4R2,
• 25.2 versions before 25.2R2.

 

A system is only affected, when packet-types is configured as follows:

[ interface <interface> auto-configure (stacked-)vlan-ranges dynamic-profile <profile-name> accept <packet-type1> ]

which allows packets of type 1 to be processed on receipt, but

[ interfaces <interface>auto-configure (stacked-)vlan-ranges authentication packet-types <packet-type2> ]

is a mismatch and doesn't require authentication for these packets.