A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).
When telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.
This issue affects:
Junos OS:
- all versions before 22.4R3-S8,
- 23.2 versions before 23.2R2-S5,
- 23.4 versions before 23.4R2;
Junos OS Evolved:
- all versions before 22.4R3-S8-EVO,
- 23.2 versions before 23.2R2-S5-EVO,
- 23.4 versions before 23.4R2-EVO.
Weakness
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Junos | Juniper | * | 22.4 (excluding) |
| Junos | Juniper | 22.4 (including) | 22.4 (including) |
| Junos | Juniper | 22.4-r1 (including) | 22.4-r1 (including) |
| Junos | Juniper | 22.4-r1-s1 (including) | 22.4-r1-s1 (including) |
| Junos | Juniper | 22.4-r1-s2 (including) | 22.4-r1-s2 (including) |
| Junos | Juniper | 22.4-r2 (including) | 22.4-r2 (including) |
| Junos | Juniper | 22.4-r2-s1 (including) | 22.4-r2-s1 (including) |
| Junos | Juniper | 22.4-r2-s2 (including) | 22.4-r2-s2 (including) |
| Junos | Juniper | 22.4-r3 (including) | 22.4-r3 (including) |
| Junos | Juniper | 22.4-r3-s1 (including) | 22.4-r3-s1 (including) |
| Junos | Juniper | 22.4-r3-s2 (including) | 22.4-r3-s2 (including) |
| Junos | Juniper | 22.4-r3-s3 (including) | 22.4-r3-s3 (including) |
| Junos | Juniper | 22.4-r3-s4 (including) | 22.4-r3-s4 (including) |
| Junos | Juniper | 22.4-r3-s5 (including) | 22.4-r3-s5 (including) |
| Junos | Juniper | 22.4-r3-s6 (including) | 22.4-r3-s6 (including) |
| Junos | Juniper | 22.4-r3-s7 (including) | 22.4-r3-s7 (including) |
| Junos | Juniper | 23.2 (including) | 23.2 (including) |
| Junos | Juniper | 23.2-r1 (including) | 23.2-r1 (including) |
| Junos | Juniper | 23.2-r1-s1 (including) | 23.2-r1-s1 (including) |
| Junos | Juniper | 23.2-r1-s2 (including) | 23.2-r1-s2 (including) |
| Junos | Juniper | 23.2-r2 (including) | 23.2-r2 (including) |
| Junos | Juniper | 23.2-r2-s1 (including) | 23.2-r2-s1 (including) |
| Junos | Juniper | 23.2-r2-s2 (including) | 23.2-r2-s2 (including) |
| Junos | Juniper | 23.2-r2-s3 (including) | 23.2-r2-s3 (including) |
| Junos | Juniper | 23.2-r2-s4 (including) | 23.2-r2-s4 (including) |
| Junos | Juniper | 23.4 (including) | 23.4 (including) |
| Junos | Juniper | 23.4-r1 (including) | 23.4-r1 (including) |
| Junos | Juniper | 23.4-r1-s1 (including) | 23.4-r1-s1 (including) |
| Junos | Juniper | 23.4-r1-s2 (including) | 23.4-r1-s2 (including) |
| Junos_os_evolved | Juniper | * | 22.4 (excluding) |
| Junos_os_evolved | Juniper | 22.4 (including) | 22.4 (including) |
| Junos_os_evolved | Juniper | 22.4-r1 (including) | 22.4-r1 (including) |
| Junos_os_evolved | Juniper | 22.4-r1-s1 (including) | 22.4-r1-s1 (including) |
| Junos_os_evolved | Juniper | 22.4-r1-s2 (including) | 22.4-r1-s2 (including) |
| Junos_os_evolved | Juniper | 22.4-r2 (including) | 22.4-r2 (including) |
| Junos_os_evolved | Juniper | 22.4-r2-s1 (including) | 22.4-r2-s1 (including) |
| Junos_os_evolved | Juniper | 22.4-r2-s2 (including) | 22.4-r2-s2 (including) |
| Junos_os_evolved | Juniper | 22.4-r3 (including) | 22.4-r3 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s1 (including) | 22.4-r3-s1 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s2 (including) | 22.4-r3-s2 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s3 (including) | 22.4-r3-s3 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s4 (including) | 22.4-r3-s4 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s5 (including) | 22.4-r3-s5 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s6 (including) | 22.4-r3-s6 (including) |
| Junos_os_evolved | Juniper | 22.4-r3-s7 (including) | 22.4-r3-s7 (including) |
| Junos_os_evolved | Juniper | 23.2 (including) | 23.2 (including) |
| Junos_os_evolved | Juniper | 23.2-r1 (including) | 23.2-r1 (including) |
| Junos_os_evolved | Juniper | 23.2-r1-s1 (including) | 23.2-r1-s1 (including) |
| Junos_os_evolved | Juniper | 23.2-r1-s2 (including) | 23.2-r1-s2 (including) |
| Junos_os_evolved | Juniper | 23.2-r2 (including) | 23.2-r2 (including) |
| Junos_os_evolved | Juniper | 23.2-r2-s1 (including) | 23.2-r2-s1 (including) |
| Junos_os_evolved | Juniper | 23.2-r2-s2 (including) | 23.2-r2-s2 (including) |
| Junos_os_evolved | Juniper | 23.2-r2-s3 (including) | 23.2-r2-s3 (including) |
| Junos_os_evolved | Juniper | 23.2-r2-s4 (including) | 23.2-r2-s4 (including) |
| Junos_os_evolved | Juniper | 23.4 (including) | 23.4 (including) |
| Junos_os_evolved | Juniper | 23.4-r1 (including) | 23.4-r1 (including) |
| Junos_os_evolved | Juniper | 23.4-r1-s1 (including) | 23.4-r1-s1 (including) |
| Junos_os_evolved | Juniper | 23.4-r1-s2 (including) | 23.4-r1-s2 (including) |