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.
To be exposed to this vulnerability subscriber management needs to be enabled via:
[system services subscriber-management enable]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2023-28974.
The following software releases have been updated to resolve this specific issue: 19.4R3-S11, 20.2R3-S7, 20.3R3-S6, 20.4R3-S6, 21.1R3-S4, 21.2R3-S4, 21.3R3-S3, 21.4R3-S2, 22.1R2-S2, 22.1R3, 22.2R2, 22.3R1-S2, 22.3R2, 22.4R1, and all subsequent releases.
This issue is being tracked as 1681389
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
2023-04-12: Initial Publication