A Buffer Access with Incorrect Length Value 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).

 

When an attacker sends a specific ICMPv6 packet to an interface with "protocols router-advertisement" configured, rpd crashes and restarts. Continued receipt of this packet will cause a sustained DoS condition. 

 

This issue only affects systems configured with IPv6.

 

This issue affects Junos OS: 

• All versions before 21.2R3-S9, 
• from 21.4 before 21.4R3-S10,
• from 22.2 before 22.2R3-S6,
• from 22.4 before 22.4R3-S4,
• from 23.2 before 23.2R2-S2,
• from 23.4 before 23.4R2;

and Junos OS Evolved:

• All versions before 21.2R3-S9-EVO,
• from 21.4-EVO before 21.4R3-S10-EVO,
• from 22.2-EVO before 22.2R3-S6-EVO,
• from 22.4-EVO before 22.4R3-S4-EVO,
• from 23.2-EVO before 23.2R2-S2-EVO,
• from 23.4-EVO before 23.4R2-EVO.

Required configuration for exposure:

The following configuration is required to be affected by this issue:
[ protocols router-advertisement interface <interface-name> ]
[ interfaces <interface-name> unit <unit> family inet6 address <ipv6-addr> ]