Denial of service in Junos OS and Junos OS Evolved RPD



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-44186
CWE-ID CWE-755
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Junos OS Evolved
Operating systems & Components / Operating system

Juniper Junos OS
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper handling of exceptional conditions

EUVDB-ID: #VU82106

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-44186

CWE-ID: CWE-755 - Improper Handling of Exceptional Conditions

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper handling of exceptional conditions in AS PATH processing when the router has Non-Stop Routing (NSR) enabled. A remote non-authenticated attacker can send a BGP update message with an AS PATH containing a large number of 4-byte ASes and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4R1-EVO - 23.2R1-S1-EVO

Juniper Junos OS: 20.4R1-S1 - 23.2R1

CPE2.3 External links

https://supportportal.juniper.net/s/article/2023-10-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-RPD-crash-when-attempting-to-send-a-very-long-AS-PATH-to-a-non-4-byte-AS-capable-BGP-neighbor-CVE-2023-44186


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.



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