CVE-2020-9240 in Taurus-AN00B
Summary
by MITRE • 10/12/2020
Taurus-AN00B versions earlier than 10.1.0.156(C00E155R7P2) have a buffer overflow vulnerability. A function in a module does not verify inputs sufficiently. Attackers can exploit this vulnerability by sending specific request. This could compromise normal service of the affected device.
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Analysis
by VulDB Data Team • 11/18/2020
The vulnerability identified as CVE-2020-9240 affects Taurus-AN00B network security appliances running firmware versions prior to 10.1.0.156(C00E155R7P2). This represents a critical buffer overflow condition that fundamentally compromises the device's ability to process incoming network requests safely. The flaw resides within a specific module where input validation mechanisms have been inadequately implemented, creating an exploitable entry point for malicious actors. The vulnerability stems from insufficient bounds checking and input sanitization practices that are essential for maintaining application integrity and preventing memory corruption attacks.
The technical exploitation of this buffer overflow vulnerability occurs when attackers craft specially malformed requests that exceed the allocated buffer space within the affected module. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector specifically targets the device's request processing pipeline, where unverified inputs are directly copied into fixed-size buffers without proper length validation or memory boundary checks. This allows attackers to potentially overwrite return addresses, function pointers, or other critical memory structures within the application's execution context.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable complete system compromise. When exploited successfully, the buffer overflow could allow attackers to execute arbitrary code within the device's operational environment, potentially leading to full system takeover. The affected device's normal service operations become compromised as attackers can manipulate the appliance's behavior through carefully constructed malicious requests. This creates a significant risk for network security infrastructure, as compromised appliances could be used to bypass security controls, redirect traffic, or serve as launching points for further attacks within the network. The vulnerability affects the device's ability to maintain secure communications and proper network filtering capabilities.
Mitigation strategies for CVE-2020-9240 should prioritize immediate firmware updates to version 10.1.0.156(C00E155R7P2) or later, which contain the necessary patches to address the insufficient input validation. Network administrators should also implement additional defensive measures including network segmentation, intrusion detection system monitoring, and traffic filtering rules that can detect and block suspicious request patterns. The vulnerability's characteristics align with ATT&CK technique T1203, which involves exploiting software vulnerabilities for privilege escalation and system compromise. Organizations should conduct thorough vulnerability assessments to identify any other potentially affected devices within their network infrastructure and implement network access controls to limit exposure. Regular security audits and patch management processes should be strengthened to prevent similar vulnerabilities from emerging in other network security components.