CVE-2012-2496 in AnyConnect Secure Mobility Client
Summary
by MITRE
A certain Java applet in the VPN downloader implementation in the WebLaunch feature in Cisco AnyConnect Secure Mobility Client 3.x before 3.0 MR7 on 64-bit Linux platforms does not properly restrict use of Java components, which allows remote attackers to execute arbitrary code via a crafted web site, aka Bug ID CSCty45925.
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Analysis
by VulDB Data Team • 12/04/2021
The vulnerability identified as CVE-2012-2496 represents a critical security flaw in Cisco AnyConnect Secure Mobility Client version 3.x prior to 3.0 MR7 on 64-bit Linux platforms. This issue specifically affects the WebLaunch feature's VPN downloader implementation where a Java applet is utilized to facilitate secure network connections. The flaw stems from insufficient restrictions on Java component usage within the applet's execution environment, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized code execution capabilities. The vulnerability exists within the client-side implementation rather than the network infrastructure itself, making it particularly dangerous as it can be triggered through web-based attacks without requiring direct network access to vulnerable systems.
The technical root cause of this vulnerability lies in the improper handling of Java applet security boundaries within the Cisco AnyConnect client's WebLaunch functionality. When a user visits a malicious website that hosts a crafted web page, the Java applet embedded in the VPN downloader component can be executed with elevated privileges beyond what should be permitted. This occurs because the applet fails to properly validate or restrict access to potentially dangerous Java APIs and system resources. The flaw essentially allows attackers to bypass the normal security sandboxing mechanisms that should prevent untrusted Java code from executing arbitrary operations on the target system. This type of vulnerability is categorized under CWE-255 Credentials Management Vulnerabilities and falls within the broader category of privilege escalation flaws that enable attackers to execute code with elevated system privileges.
The operational impact of CVE-2012-2496 is severe and far-reaching for organizations utilizing Cisco AnyConnect clients on 64-bit Linux platforms. Attackers can exploit this vulnerability to execute arbitrary code on affected systems, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The remote nature of the attack means that users can be compromised simply by visiting a malicious website, making this vulnerability particularly dangerous in environments where users may encounter untrusted web content. Organizations may face significant security breaches, regulatory compliance violations, and potential financial losses due to unauthorized access to sensitive corporate networks. The vulnerability also impacts the integrity of the client-side security model, undermining the trust model that Cisco AnyConnect is designed to provide. This flaw can be exploited as part of larger attack campaigns where initial access is gained through web-based phishing or drive-by download attacks, potentially leading to lateral movement within networks and compromise of additional systems.
Mitigation strategies for CVE-2012-2496 should focus on immediate patching and deployment of Cisco AnyConnect 3.0 MR7 or later versions that address the Java applet security restrictions. Organizations should implement network-based controls to block access to known malicious domains and monitor for suspicious web traffic patterns that may indicate exploitation attempts. System administrators should disable Java applets in web browsers where possible and implement strict network segmentation to limit the potential impact of successful exploitation. The implementation of security monitoring solutions that can detect unusual code execution patterns or unauthorized network connections can provide additional layers of defense. Additionally, user education programs should emphasize the importance of avoiding untrusted websites and suspicious web content. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and code execution through trusted applications, making it particularly relevant for organizations implementing security controls focused on application whitelisting and runtime application protection. Organizations should also consider implementing endpoint detection and response solutions to identify and respond to exploitation attempts in real-time.