CVE-2023-20240 : What You Need to Know

This CVE record details multiple vulnerabilities found in Cisco Secure Client Software, previously known as AnyConnect Secure Mobility Client. These vulnerabilities could be exploited by an authenticated, local attacker to trigger a denial of service (DoS) situation on the affected system. The vulnerabilities stem from an out-of-bounds memory read in Cisco Secure Client Software, allowing an attacker to crash the VPN Agent service by sending crafted packets to a specific port on the local host.

Understanding CVE-2023-20240

The CVE-2023-20240 focuses on vulnerabilities within Cisco Secure Client Software that could potentially lead to a denial of service scenario on the affected system.

What is CVE-2023-20240?

CVE-2023-20240 points out vulnerabilities in Cisco Secure Client Software that could be exploited by a local attacker with valid credentials to cause a DoS condition by crashing the VPN Agent service.

The Impact of CVE-2023-20240

The impact of CVE-2023-20240 is significant as it allows attackers to disrupt the VPN Agent service, rendering it unavailable to all users on the system. This could potentially lead to operational disruptions and security concerns for organizations using the affected versions of the software.

Technical Details of CVE-2023-20240

The technical details of CVE-2023-20240 shed light on the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerabilities in Cisco Secure Client Software allow attackers to trigger a DoS condition by exploiting an out-of-bounds memory read, crashing the VPN Agent service on the affected system.

Affected Systems and Versions

Numerous versions of Cisco Secure Client software are affected by CVE-2023-20240, ranging from version 4.9.00086 to version 5.0.03076. Users of these versions are vulnerable to the described DoS attack.

Exploitation Mechanism

Attackers can exploit these vulnerabilities by logging into an affected device while another user is accessing Cisco Secure Client on the same system, then sending malicious packets to a specific port on the local host. Successful exploitation results in the crashing of the VPN Agent service.

Mitigation and Prevention

Taking immediate steps, implementing long-term security practices, and applying necessary patches and updates are crucial in mitigating the risks posed by CVE-2023-20240.

Immediate Steps to Take

Users are advised to ensure that only trusted individuals have access to multi-user systems running affected versions of Cisco Secure Client Software. Monitoring network activities and limiting access privileges can also help prevent unauthorized exploitation.

Long-Term Security Practices

Implementing network segmentation, regular security audits, and employee cybersecurity training are essential long-term security practices to enhance overall system security and resilience against potential attacks.

Patching and Updates

Cisco may release patches or updates to address the vulnerabilities outlined in CVE-2023-20240. It is imperative for users to stay informed about security advisories and promptly apply recommended patches to mitigate the risk of exploitation.