Description (CNA)
A traffic classification vulnerability in Juniper Networks Junos OS on the SRX Series Services Gateways may allow an attacker to bypass Juniper Deep Packet Inspection (JDPI) rules and access unauthorized networks or resources, when 'no-syn-check' is enabled on the device. While JDPI correctly classifies out-of-state asymmetric TCP flows as the dynamic-application UNKNOWN, this classification is not provided to the policy module properly and hence traffic continues to use the pre-id-default-policy, which is more permissive, causing the firewall to allow traffic to be forwarded that should have been denied. This issue only occurs when 'set security flow tcp-session no-syn-check' is configured on the device. This issue affects Juniper Networks Junos OS on SRX Series: 18.4 versions prior to 18.4R2-S10, 18.4R3-S10; 19.1 versions prior to 19.1R3-S8; 19.2 versions prior to 19.2R1-S8, 19.2R3-S4; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R2-S2, 20.4R3; 21.1 versions prior to 21.1R2-S2, 21.1R3; 21.2 versions prior to 21.2R2. This issue does not affect Juniper Networks Junos OS versions prior to 18.4R1.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Juniper Networks / Junos OS | affected 18.4 before 18.4R2-S10, 18.4R3-S10; affected 19.1 before 19.1R3-S8; affected 19.2 before 19.2R1-S8, 19.2R3-S4; affected 19.3 before 19.3R3-S3; affected 19.4 before 19.4R3-S5; affected 20.1 before 20.1R3-S1; affected 20.2 before 20.2R3-S2; affected 20.3 before 20.3R3-S1; affected 20.4 before 20.4R2-S2, 20.4R3; affected 21.1 before 21.1R2-S2, 21.1R3; affected 21.2 before 21.2R2 |
| Juniper Networks / Junos OS | unaffected unspecified before 18.4R1 |
CWE
CWE-863
References
ADP enrichment
No English description supplied.