Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit

Summary

A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2.

Timeline

1. Apr 22, 2021, 7:36 PM UTCCVE published
2. Sep 16, 2024, 8:16 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 17.3R3-S12; From 17.4 · fixed in 17.4R2-S13; From 18.1 · fixed in 18.1R3-S13; From 18.2 · fixed in 18.2R3-S8; From 18.3 · fixed in 18.3R3-S5; From 19.1 · fixed in 19.1R3-S4; From 19.2 · fixed in 19.2R3-S2; From 19.3 · fixed in 19.3R3-S1; From 19.4 · fixed in 19.4R3-S1; From 20.1 · fixed in 20.1R2; From 20.2 · fixed in 20.2R2; From 20.3 · fixed in 20.3R2

References 1