Description (CNA)
When user-defined ARP Policer is configured and applied on one or more Aggregated Ethernet (AE) interface units, a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability between the Device Control Daemon (DCD) and firewall process (dfwd) daemons of Juniper Networks Junos OS allows an attacker to bypass the user-defined ARP Policer. In this particular case the User ARP policer is replaced with default ARP policer. To review the desired ARP Policers and actual state one can run the command "show interfaces <> extensive" and review the output. See further details below. An example output is: show interfaces extensive | match policer Policer: Input: __default_arp_policer__ <<< incorrect if user ARP Policer was applied on an AE interface and the default ARP Policer is displayed Policer: Input: jtac-arp-ae5.317-inet-arp <<< correct if user ARP Policer was applied on an AE interface For all platforms, except SRX Series: This issue affects Juniper Networks Junos OS: All versions 5.6R1 and all later versions prior to 18.4 versions prior to 18.4R2-S9, 18.4R3-S9 with the exception of 15.1 versions 15.1R7-S10 and later versions; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2; This issue does not affect Juniper Networks Junos OS versions prior to 5.6R1. On SRX Series this issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.4 versions prior to 19.4R3-S4; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3-S2; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. This issue does not affect 18.4 versions prior to 18.4R1 on SRX Series. This issue does not affect Junos OS Evolved.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Juniper Networks / Junos OS | unaffected unspecified before 5.6R1; affected 5.6R1 before 5.6*; affected 15.1 before 15.1R7-S10; affected 16.1R1 before 16.1*; affected 16.2R1 before 16.2*; affected 17.1R1 before 17.1*; affected 17.2R1 before 17.2*; affected 17.3R1 before 17.3*; affected 17.4R1 before 17.4*; affected 18.1R1 before 18.1*; affected 18.2R1 before 18.2*; affected 18.3R1 before 18.3*; affected 18.4 before 18.4R2-S9, 18.4R3-S9; affected 19.4 before 19.4R3-S3; affected 20.1 before 20.1R3; affected 20.2 before 20.2R3-S2; affected 20.3R1 before 20.3*; affected 20.4 before 20.4R3; affected 21.1 before 21.1R2 |
| Juniper Networks / Junos OS | affected 18.4 before 18.4R2-S9, 18.4R3-S9; affected 19.4 before 19.4R3-S3; affected 20.1 before 20.1R3; unaffected 20.2 before 20.2R3-S2; affected 20.3R1 before 20.3*; affected 20.4 before 20.4R3; affected 21.1 before 21.1R2 |
| Juniper Networks / Junos OS Evolved | unaffected Any |
CWE
CWE-367
References
ADP enrichment
No English description supplied.