Junos OS: MX Series: In a BBE scenario upon receipt of specific malformed packets from subscribers the process bbe-smgd will crash

Summary

An Improper Check for Unusual or Exceptional Conditions vulnerability in the bbe-smgd of Juniper Networks Junos OS allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). In a Broadband Edge / Subscriber Management scenario on MX Series when a specifically malformed ICMP packet addressed to the device is received from a subscriber the bbe-smgd will crash, affecting the subscriber sessions that are connecting, updating, or terminating. Continued receipt of such packets will lead to a sustained DoS condition. When this issue happens the below log can be seen if the traceoptions for the processes smg-service are enabled: BBE_TRACE(TRACE_LEVEL_INFO, "%s: Dropped unsupported ICMP PKT ... This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 19.4R3-S11; 20.2 versions prior to 20.2R3-S7; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3-S2; 22.1 versions prior to 22.1R2-S2, 22.1R3; 22.2 versions prior to 22.2R2; 22.3 versions prior to 22.3R1-S2, 22.3R2.

Timeline

1. Apr 17, 2023, 12:00 AM UTCCVE published
2. Feb 6, 2025, 2:35 PM UTCCISA SSVC assessment

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

3. Feb 6, 2025, 2:35 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 19.4R3-S11; From 20.2 · fixed in 20.2R3-S7; From 20.3 · fixed in 20.3R3-S6; From 20.4 · fixed in 20.4R3-S6; From 21.1 · fixed in 21.1R3-S4; From 21.2 · fixed in 21.2R3-S4; From 21.3 · fixed in 21.3R3-S3; From 21.4 · fixed in 21.4R3-S2; From 22.2 · fixed in 22.2R2

References 1