Juniper Networks Junos OS Evolved prior 22.4R3-EVO vmcore unusual condition

Summaryinfo

A vulnerability labeled as critical has been found in Juniper Networks Junos OS Evolved. This vulnerability affects unknown code of the component vmcore. Executing a manipulation can lead to unusual condition. This vulnerability is registered as CVE-2024-39559. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Juniper Networks Junos OS Evolved and classified as critical. This vulnerability affects an unknown part of the component vmcore. The manipulation with an unknown input leads to a unusual condition vulnerability. The CWE definition for the vulnerability is CWE-754. The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product. As an impact it is known to affect availability. CVE summarizes:

An Improper Check for Unusual or Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS Evolved may allow a network-based unauthenticated attacker to crash the device (vmcore) by sending a specific TCP packet over an established TCP session with MD5 authentication enabled, destined to an accessible port on the device, resulting in a Denial of Service (DoS).  The receipt of this packet must occur within a specific timing window outside the attacker's control (i.e., race condition). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects dual RE systems with Nonstop Active Routing (NSR) enabled. Exploitation can only occur over TCP sessions with MD5 authentication enabled (e.g., BGP with MD5 authentication). This issue affects Junos OS Evolved:  * All versions before 21.2R3-S8-EVO, * from 21.4-EVO before 21.4R3-S6-EVO, * from 22.1-EVO before 22.1R3-S4-EVO, * from 22.2-EVO before 22.2R3-S4-EVO, * from 22.3-EVO before 22.3R3-S3-EVO, * from 22.4-EVO before 22.4R2-S2-EVO, 22.4R3-EVO.

The advisory is shared for download at supportportal.juniper.net. This vulnerability was named CVE-2024-39559 since 06/25/2024. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/11/2024).

Upgrading to version 21.2R3-S8-EVO, 21.4R3-S6-EVO, 22.1R3-S4-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R2-S2-EVO or 22.4R3-EVO eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Juniper Networks

Name

• Junos OS Evolved

License

• commercial

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