Description:

CVE-2024-21591 is an Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series. This vulnerability allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device. The issue is caused by an insecure function allowing an attacker to overwrite arbitrary memory.

Key Insights:

1. Severity: The CVSS score of 9.8 indicates that this vulnerability is critical and poses a severe threat to affected systems. The SVRS of 34, while lower than the CVSS score, still signifies a significant risk that requires immediate attention.

2. Affected Systems: This vulnerability affects a wide range of Juniper Networks Junos OS SRX Series and EX Series devices running various versions of the operating system. Organizations using these devices should promptly apply the available patches or workarounds to mitigate the risk.

3. Attack Vectors: The vulnerability can be exploited remotely over the network, making it accessible to attackers without physical access to the affected devices. This increases the potential impact and ease of exploitation.

4. Potential Impact: Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code, gain root privileges, and compromise the affected device. This could lead to data theft, disruption of services, or further attacks on the network.

Mitigation Strategies:

1. Apply Patches: Organizations should prioritize applying the latest security patches released by Juniper Networks for the affected Junos OS versions. These patches address the vulnerability and mitigate the risk of exploitation.

2. Restrict Network Access: Implement network segmentation and access control measures to limit the exposure of affected devices to untrusted networks and potential attackers.

3. Enable Intrusion Detection and Prevention Systems: Deploy intrusion detection and prevention systems (IDS/IPS) to monitor network traffic and detect suspicious activities that may indicate exploitation attempts.

4. Educate Users: Provide security awareness training to users to educate them about the risks associated with this vulnerability and encourage them to practice safe computing habits.

Additional Information:

• Threat Actors/APT Groups: There is no information available regarding specific threat actors or APT groups actively exploiting this vulnerability.

• Exploit Status: Active exploits have been published, indicating that attackers may have the capability to exploit this vulnerability.

• CISA Warnings: The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning regarding this vulnerability, urging organizations to take immediate action to mitigate the risk.

• In the Wild: There is no information available to confirm whether this vulnerability is actively exploited by hackers in the wild.

If users have additional queries regarding this incident, they can use the 'Ask to Analyst' feature, contact SOCRadar directly, or open a support ticket for more information if necessary.