A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).
In a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.
The memory usage of jdhcpd can be monitored with:
user@host> show system processes extensive | match jdhcpd
This issue affects Junos OS:
- all versions before 22.4R3-S1,
- 23.2 versions before 23.2R2,
- 23.4 versions before 23.4R2.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
There are no known workarounds for this issue.
The following software releases have been updated to resolve this specific issue: 22.4R3-S1, 23.2R2, 23.4R2, 24.2R1, and all subsequent releases.