CVE-2016-1445 in ASA
Summary
by MITRE
Cisco Adaptive Security Appliance (ASA) Software 8.2 through 9.4.3.3 allows remote attackers to bypass intended ICMP Echo Reply ACLs via vectors related to subtypes.
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Analysis
by VulDB Data Team • 10/14/2024
The vulnerability identified as CVE-2016-1445 affects Cisco Adaptive Security Appliance (ASA) software versions 8.2 through 9.4.3.3, representing a significant security flaw that undermines the intended access control mechanisms for ICMP traffic. This issue specifically targets the handling of ICMP Echo Reply packets and their associated access control list (ACL) enforcement, creating a pathway for unauthorized network access that bypasses critical security controls. The vulnerability stems from improper validation of ICMP subtypes within the ASA's packet processing logic, allowing malicious actors to exploit the system's ACL configuration through carefully crafted ICMP traffic patterns.
The technical flaw manifests in the ASA's inability to properly validate ICMP subtype information during packet inspection, particularly when processing Echo Reply messages. This weakness enables attackers to craft packets that appear to comply with configured ACL rules while actually bypassing them due to insufficient subtype verification. The vulnerability operates at the network layer where ICMP traffic is processed, leveraging the fact that certain ICMP subtypes may not be properly validated against the access control policies that should govern their transmission. This misconfiguration allows attackers to inject ICMP traffic that would normally be blocked by ACL rules, effectively creating a backdoor for network reconnaissance and potential further exploitation.
The operational impact of this vulnerability extends beyond simple access bypass, as it can enable attackers to perform network reconnaissance activities without detection, potentially leading to more severe security breaches. Remote attackers can exploit this weakness to gather information about network topology, device configurations, and potentially identify other vulnerable systems within the network infrastructure. The implications are particularly concerning for organizations that rely heavily on ASA appliances for network security, as this vulnerability could allow attackers to circumvent critical network segmentation controls and gain unauthorized access to sensitive network resources. This vulnerability aligns with CWE-284 Access Control Issues, specifically addressing inadequate enforcement of access control mechanisms for network traffic.
Mitigation strategies for CVE-2016-1445 should focus on immediate software updates to patched versions of Cisco ASA software, as well as implementing additional network monitoring measures to detect anomalous ICMP traffic patterns. Organizations should also review and validate their existing ICMP ACL configurations to ensure that proper subtype filtering is implemented at the network boundary. The implementation of network behavior analysis tools can help identify unusual ICMP traffic that may indicate exploitation attempts. Additionally, network administrators should consider implementing more granular access control policies that explicitly define ICMP traffic handling rules, including specific restrictions on ICMP subtypes that are commonly exploited. This vulnerability demonstrates the importance of maintaining up-to-date security patches and the critical need for thorough testing of security controls in network infrastructure devices. The attack surface for this vulnerability can be reduced by implementing network segmentation strategies that limit the exposure of critical systems to untrusted networks, while also ensuring that all network devices are configured according to security best practices as outlined in frameworks such as the NIST Cybersecurity Framework and MITRE ATT&CK matrix for network security operations.