Traffic classification vulnerabilities in Juniper Junos OS
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2022-22157 CVE-2022-22167 |
| CWE-ID | CWE-254 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Juniper Junos OS Operating systems & Components / Operating system |
| Vendor | Juniper Networks, Inc. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Security features bypass
EUVDB-ID: #VU59624
Risk: Medium
CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-22157
CWE-ID:
CWE-254 - Security Features
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsJuniper Junos OS: 18.4 - 21.1R1
External linkshttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA11265&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Security features bypass
EUVDB-ID: #VU59625
Risk: Medium
CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-22167
CWE-ID:
CWE-254 - Security Features
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to 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. 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. A remote attacker can bypass Juniper Deep Packet Inspection (JDPI) rules and access unauthorized networks or resources.
Note, the issue only occurs when 'set security flow tcp-session no-syn-check' is configured on the device.
MitigationInstall updates from vendor's website.
Vulnerable software versionsJuniper Junos OS: 18.4 - 21.2R1-S2
External linkshttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA11265&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
