CVE-2020-3370 in Content Security Management Appliance
Summary
by MITRE
A vulnerability in URL filtering of Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to bypass URL filtering on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted, malicious HTTP request to an affected device. A successful exploit could allow the attacker to redirect users to malicious sites.
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Analysis
by VulDB Data Team • 11/04/2020
The vulnerability identified as CVE-2020-3370 affects Cisco Content Security Management Appliances, which are widely deployed for content filtering and web security enforcement within enterprise networks. These appliances serve as critical components in protecting organizations from malicious web content and enforcing security policies across their digital infrastructure. The vulnerability resides in the URL filtering mechanism that governs how the appliance processes and evaluates web requests, representing a fundamental weakness in the device's security posture. This flaw specifically targets the input validation processes that should prevent malicious requests from bypassing security controls and reaching end users.
The technical exploitation of CVE-2020-3370 stems from inadequate validation of HTTP request parameters within the URL filtering subsystem. An attacker can craft specifically designed HTTP requests that exploit parsing inconsistencies or validation gaps in the appliance's processing logic. This insufficient input validation creates a pathway for malicious actors to manipulate the URL filtering mechanism without requiring authentication credentials or privileged access to the device. The vulnerability essentially allows an unauthenticated remote attacker to manipulate the appliance's behavior through crafted network traffic, bypassing the intended security controls that should prevent access to malicious websites.
The operational impact of this vulnerability extends beyond simple bypass of web filtering policies, as it fundamentally undermines the security infrastructure that organizations rely upon for protection against cyber threats. When successfully exploited, the vulnerability enables attackers to redirect users to malicious sites, potentially leading to phishing attacks, malware distribution, or data exfiltration. This represents a critical compromise in network security where the very device designed to protect against such threats becomes a vector for attack. Organizations using affected appliances may experience unauthorized access to restricted content, potential data breaches, and increased exposure to advanced persistent threats that could leverage this vulnerability as an initial access point.
Security professionals should implement immediate mitigations including applying the latest Cisco security patches and updates to address the input validation deficiencies. Network administrators should also consider implementing additional monitoring and logging mechanisms to detect anomalous traffic patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of how insufficient validation can lead to privilege escalation and access control bypass. From an ATT&CK framework perspective, this vulnerability maps to techniques involving initial access through network infiltration and privilege escalation, potentially enabling lateral movement within compromised networks. Organizations should also review their existing security controls to ensure that layered defenses can detect and prevent exploitation attempts even when primary protections are bypassed, emphasizing the importance of defense in depth strategies in modern cybersecurity implementations.