Security features bypass in Junos OS - CVE-2022-22157
Published: January 17, 2022
Vulnerability identifier: #VU59624
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-22157
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker by bypass implemented security restrictions.
The vulnerability exists due to a traffic classification issue on the SRX Series Services Gateways when 'no-syn-check' is enabled on the device. JDPI incorrectly classifies out-of-state asymmetric TCP flows as the dynamic-application INCONCLUSIVE instead of UNKNOWN, which is more permissive, causing the firewall to allow traffic to be forwarded that should have been denied. A remote attacker can bypass Juniper Deep Packet Inspection (JDPI) rules and access unauthorized networks or resources.
Note, this issue only occurs when 'set security flow tcp-session no-syn-check' is configured on the device.
Affected software
Junos OS
How to mitigate CVE-2022-22157
Install updates from vendor's website.
Junos OS - addressed in versions 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S2, 19.4R2-S5, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1