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Cisco Patches High-Severity Vulnerabilities in VPN Product

High-severity flaws in Cisco Secure Client could lead to code execution and unauthorized remote access VPN sessions.

Cisco on Wednesday announced patches for two high-severity vulnerabilities in Secure Client, the enterprise VPN application that also incorporates security and monitoring capabilities.

The first issue, tracked as CVE-2024-20337, impacts the Linux, macOS, and Windows versions of Secure Client and could be exploited remotely, without authentication, in carriage return line feed (CRLF) injection attacks.

Because user-supplied input is insufficiently validated, an attacker tricking a user to click a crafted link while establishing a VPN session could execute arbitrary scripts in the victim’s browser or access sensitive information, such as SAML tokens.

“The attacker could then use the token to establish a remote access VPN session with the privileges of the affected user. Individual hosts and services behind the VPN headend would still need additional credentials for successful access,” Cisco explains in its advisory.

According to Cisco, only Secure Client instances where the VPN headend is configured with the SAML External Browser feature are vulnerable.

The tech giant addressed the flaw with the release of Secure Client versions 4.10.08025 and 5.1.2.42. Iterations prior to version 4.10.04065 are not vulnerable and no patches are available for version 5.0.

The second high-severity bug, tracked as CVE-2024-20338, only affects Secure Client for Linux and requires authentication for successful exploitation. Version 5.1.2.42 of the VPN application resolves the bug.

“An attacker could exploit this vulnerability by copying a malicious library file to a specific directory in the filesystem and persuading an administrator to restart a specific process. A successful exploit could allow the attacker to execute arbitrary code on an affected device with root privileges,” Cisco explains.

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On Wednesday, Cisco also announced patches for multiple medium-severity flaws in AppDynamics Controller and Duo Authentication for Windows Logon and RDP, which could lead to data leaks and secondary authentication bypass.

Two other medium-severity defects in Small Business 100, 300, and 500 APs will remain unpatched, as these products have reached end-of-life (EoL) status.

The tech giant says it is not aware of any of these vulnerabilities being exploited in the wild. Additional information can be found on Cisco’s security advisories page.

Related: Cisco Patches High-Severity Vulnerabilities in Data Center OS

Related: Cisco Patches Critical Vulnerabilities in Enterprise Communication Devices

Related: Cisco Patches Critical Vulnerability in Enterprise Collaboration Products

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

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