Junos OS and Junos OS Evolved: In a BMP scenario receipt of a malformed AS PATH attribute can cause an RPD crash

Summary

An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).  In a scenario where BGP Monitoring Protocol (BMP) is configured with rib-in pre-policy monitoring, receiving a BGP update with a specifically malformed AS PATH attribute over an established BGP session, can cause an RPD crash and restart. This issue affects: Junos OS:  • All versions before 21.2R3-S8, • 21.4 versions before 21.4R3-S8, • 22.2 versions before 22.2R3-S4, • 22.3 versions before 22.3R3-S3, • 22.4 versions before 22.4R3-S2, • 23.2 versions before 23.2R2-S1, • 23.4 versions before 23.4R1-S2, 23.4R2; Junos OS Evolved: • All versions before 21.2R3-S8-EVO, • 21.4 versions before 21.4R3-S8-EVO, • 22.2 versions before 22.2R3-S4-EVO, • 22.3 versions before 22.3R3-S3-EVO, • 22.4 versions before 22.4R3-S2-EVO, • 23.2 versions before 23.2R2-S1-EVO, • 23.4 versions before 23.4R1-S2-EVO, 23.4R2-EVO.

Timeline

1. Oct 11, 2024, 3:30 PM UTCCVE published
2. Oct 11, 2024, 5:31 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 11, 2024, 5:37 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 21.2R3-S8; From 21.4 · fixed in 21.4R3-S8; From 22.2 · fixed in 22.2R3-S4; From 22.3 · fixed in 22.3R3-S3; From 22.4 · fixed in 22.4R3-S2; From 23.2 · fixed in 23.2R2-S1

• Juniper Networks Junos OS Evolved

  fixed in 21.2R3-S8-EVO; From 21.4 · fixed in 21.4R3-S8-EVO; From 22.2 · fixed in 22.2R3-S4-EVO; From 22.3 · fixed in 22.3R3-S3-EVO; From 22.4 · fixed in 22.4R3-S2-EVO; From 23.2 · fixed in 23.2R2-S1-EVO

References 1