When DNS filtering is enabled on Juniper Networks Junos MX Series with one of the following cards MS-PIC, MS-MIC or MS-MPC, an incoming stream of packets processed by the Multiservices PIC Management Daemon (mspmand) process, responsible for managing "URL Filtering service", may crash, causing the Services PIC to restart. While the Services PIC is restarting, all PIC services including DNS filtering service (DNS sink holing) will be bypassed until the Services PIC completes its boot process. This vulnerability might allow an attacker to cause an extended Denial of Service (DoS) attack against the device and to cause clients to be vulnerable to DNS based attacks by malicious DNS servers when they send DNS requests through the device. As a result, devices which were once protected by the DNS
The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S8, 18.3R3-S1, 18.4R3, 19.1R3, 19.2R2, 19.3R3, 19.4R1 and all subsequent releases.
There are no viable workarounds for this issue.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.3<17.3R3-S8 | 17.3R3-S8 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S1 | 18.3R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R3 | 18.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R3 | 19.1R3 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R2 | 19.2R2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3 | 19.3R3 | advisory ↗ |