CVE-2018-12239 in Endpoint Protection
Summary
by MITRE
Norton prior to 22.15; Symantec Endpoint Protection (SEP) prior to 12.1.7454.7000 & 14.2; Symantec Endpoint Protection Small Business Edition (SEP SBE) prior to NIS-22.15.1.8 & SEP-12.1.7454.7000; and Symantec Endpoint Protection Cloud (SEP Cloud) prior to 22.15.1 may be susceptible to an AV bypass issue, which is a type of exploit that works to circumvent one of the virus detection engines to avoid a specific type of virus protection. One of the antivirus engines depends on a signature pattern from a database to identify malicious files and viruses; the antivirus bypass exploit looks to alter the file being scanned so it is not detected.
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Analysis
by VulDB Data Team • 04/16/2020
This vulnerability represents a critical antivirus bypass issue affecting multiple Symantec security products including Norton, Symantec Endpoint Protection, and Symantec Endpoint Protection Small Business Edition. The flaw exists in the signature-based detection mechanisms that form the foundation of traditional antivirus protection systems. These products rely on pattern matching databases to identify and block malicious files, making them susceptible to sophisticated evasion techniques that manipulate file characteristics to avoid detection. The vulnerability impacts versions prior to specific thresholds including Norton 22.15, SEP 12.1.7454.7000, and SEP Cloud 22.15.1, indicating a widespread issue across the Symantec product portfolio that affects enterprise and consumer security implementations. This type of vulnerability directly contradicts the fundamental security principle that antivirus systems should provide comprehensive protection against known threats through signature-based detection methods.
The technical implementation of this bypass exploit leverages the inherent weaknesses in signature pattern matching systems where malicious actors can modify file attributes, code structures, or metadata in ways that preserve functionality while altering the detectable characteristics that antivirus engines use to identify threats. This approach operates at the intersection of software manipulation and security bypass techniques, where the exploit specifically targets the signature database matching process rather than attempting to exploit system vulnerabilities or network protocols. The vulnerability demonstrates how advanced persistent threats can leverage the predictable nature of signature-based systems to evade protection, as the modified files maintain their intended functionality while becoming undetectable to the antivirus engines. This technique aligns with attack patterns documented in the mitre ATT&CK framework under adversary tactics involving evasion and defense evasion techniques, where attackers specifically target detection mechanisms rather than exploiting system weaknesses.
The operational impact of this vulnerability extends beyond individual system compromises to affect enterprise security postures and organizational risk management strategies. When antivirus systems fail to detect malicious files through signature-based methods, it creates a false sense of security that can lead to prolonged exposure to threats. Organizations relying on these security products face increased risk of malware infiltration, data breaches, and compliance violations as the bypass allows malicious payloads to execute undetected within protected environments. The vulnerability particularly affects enterprise environments where centralized security management and consistent protection policies are critical for maintaining security hygiene. Security administrators must consider that this bypass could enable attackers to maintain persistence within networks, exfiltrate sensitive data, or deploy additional malicious tools without triggering security alerts. The implications extend to incident response procedures, as security teams may not receive timely alerts about malicious activity that should have been detected by signature-based antivirus systems.
Mitigation strategies for this vulnerability require immediate patching of affected Symantec products to versions that address the signature bypass mechanisms. Organizations should implement layered security approaches that supplement signature-based detection with behavioral analysis, heuristic scanning, and real-time monitoring capabilities to provide redundancy against signature-based evasion techniques. Security teams must conduct comprehensive vulnerability assessments to identify systems running affected versions and ensure proper patch management procedures are in place. The remediation process should include verification that updated signature databases are properly installed and that all antivirus engines are functioning correctly. Additionally, organizations should consider implementing network monitoring solutions, endpoint detection and response systems, and regular security audits to detect potential exploitation attempts. This vulnerability highlights the importance of maintaining up-to-date security software and the necessity of adopting multi-layered defense strategies that do not rely solely on signature-based detection methods, as recommended in industry best practices for enterprise cybersecurity resilience. The issue also underscores the need for continuous monitoring of security vendor advisories and proactive vulnerability management programs to address emerging threats effectively.