A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause impact to the availability of the device.

When static route points to a reject next hop and a gNMI query is processed for that static route, rpd crashes and restarts.

This issue affects:

Junos OS: 

• all versions before 21.2R3-S9,
• 21.4 versions before 21.4R3-S10, 
• 22.2 versions before 22.2R3-S6,
• 22.4 versions before 22.4R3-S6,
• 23.2 versions before 23.2R2-S3,
• 23.4 versions before 23.4R2-S4,
• 24.2 versions before 24.2R1-S2, 24.2R2;

 

Junos OS Evolved:

• all versions before 22.4R3-S7-EVO,
• 23.2-EVO versions before 23.2R2-S3-EVO,
• 23.4-EVO versions before 23.4R2-S4-EVO,
• 24.2-EVO versions before 24.2R2-EVO.

 

To be exposed to this issue the system needs to be configured for GRPC:

[ system services extension-service request-response grpc ]

and a static route needs to point to a reject next-hop as shown in the following example:

[ routing-options static route 192.0.2.0/24 next-hop 198.51.100.1 resolve ]
[ routing-options static route 198.51.100.1/32 reject]

 

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

 

This issue was found during internal product security testing or research.