CVE-2014-2127 in ASA
Summary
by MITRE
Cisco Adaptive Security Appliance (ASA) Software 8.x before 8.2(5.48), 8.3 before 8.3(2.40), 8.4 before 8.4(7.9), 8.6 before 8.6(1.13), 9.0 before 9.0(4.1), and 9.1 before 9.1(4.3) does not properly process management-session information during privilege validation for SSL VPN portal connections, which allows remote authenticated users to gain privileges by establishing a Clientless SSL VPN session and entering crafted URLs, aka Bug ID CSCul70099.
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Analysis
by VulDB Data Team • 05/10/2026
The vulnerability described in CVE-2014-2127 represents a critical privilege escalation flaw within Cisco Adaptive Security Appliance (ASA) software versions spanning multiple release lines from 8.2 through 9.1. This issue specifically targets the management-session processing mechanisms during SSL VPN portal connections, creating a pathway for authenticated attackers to elevate their privileges without proper authorization. The vulnerability affects organizations relying on ASA appliances for secure remote access, particularly those utilizing Clientless SSL VPN functionality as part of their network security infrastructure. The flaw was identified through internal Cisco bug tracking systems and subsequently disclosed to the broader security community, highlighting the importance of proper privilege validation mechanisms in network security appliances.
The technical root cause of this vulnerability lies in the improper handling of management-session information during the SSL VPN privilege validation process. When users establish Clientless SSL VPN sessions, the ASA software fails to adequately validate session parameters and user privileges before granting access to administrative functions. This misconfiguration allows authenticated users to manipulate session state information through crafted URL inputs, effectively bypassing the normal access control mechanisms that should prevent privilege escalation. The flaw specifically manifests when the system processes certain URL parameters that should be restricted to administrative users, but instead are processed with insufficient validation checks. This type of vulnerability falls under the CWE-264 category of "Permissions, Privileges, and Access Controls" and represents a classic case of insufficient input validation leading to privilege escalation.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to potentially gain full administrative control over the affected ASA appliances. Once an attacker successfully exploits this vulnerability, they can access sensitive network configuration data, modify firewall rules, view network traffic, and potentially pivot to other systems within the network. The remote nature of the attack means that exploitation does not require physical access to the network infrastructure, making it particularly dangerous for organizations with remote workforce policies that rely heavily on SSL VPN connections. This vulnerability directly impacts the CIA triad by compromising both confidentiality and integrity of the network security infrastructure, as attackers can access and modify critical security parameters without detection. The attack vector through Clientless SSL VPN sessions makes this particularly concerning for organizations that depend on web-based remote access solutions.
Organizations affected by this vulnerability should immediately implement mitigation strategies focusing on both immediate remediation and long-term security enhancements. The primary recommendation involves upgrading to patched versions of Cisco ASA software as specified in the CVE advisory, with particular attention to the version numbers mentioned in the vulnerability description. Network administrators should also implement additional monitoring and logging of SSL VPN session activities to detect anomalous behavior patterns that might indicate exploitation attempts. Configuration hardening measures including stricter access control policies for SSL VPN portals, implementation of multi-factor authentication, and regular security audits of remote access configurations should be enforced. The vulnerability demonstrates the importance of proper session management and input validation in network security appliances, aligning with ATT&CK techniques related to privilege escalation and defense evasion. Organizations should also consider implementing network segmentation and least-privilege access models to limit the potential impact of successful exploitation attempts, while maintaining detailed audit trails of all administrative activities within the ASA infrastructure.