CVE-2020-6590 in Web Security Content Gateway
Summary
by MITRE • 04/09/2021
Forcepoint Web Security Content Gateway versions prior to 8.5.4 improperly process XML input, leading to information disclosure.
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Analysis
by VulDB Data Team • 04/15/2021
The vulnerability identified as CVE-2020-6590 affects Forcepoint Web Security Content Gateway versions before 8.5.4 and represents a critical flaw in XML processing that can lead to unauthorized information disclosure. This issue stems from inadequate input validation mechanisms within the web security appliance's XML parser implementation, creating a potential attack vector for malicious actors to extract sensitive data from the affected system. The vulnerability manifests when the appliance processes malformed or specially crafted XML content that triggers unexpected behavior in the underlying processing engine, potentially exposing internal system information or data that should remain confidential.
The technical root cause of this vulnerability lies in the improper handling of XML input streams within the Forcepoint Content Gateway's processing pipeline. When the system encounters XML data that does not conform to expected standards or contains crafted malicious elements, the XML parser fails to properly validate or sanitize the input before processing. This processing error can result in information leakage through various mechanisms including memory dumps, internal system state exposure, or unintended data retrieval from the appliance's internal components. The flaw essentially creates a path where attackers can manipulate XML input to trigger information disclosure behaviors that should not occur under normal operating conditions.
The operational impact of this vulnerability extends beyond simple data exposure, as it can enable attackers to gain insights into the internal workings of the web security appliance and potentially identify additional attack vectors. An adversary exploiting this vulnerability could extract system configuration details, internal network information, user data, or other sensitive information that would normally be protected by the security appliance's design. This information disclosure could significantly weaken the overall security posture of organizations relying on the affected Forcepoint appliances, as attackers could use the leaked information to plan more sophisticated attacks against the network infrastructure. The vulnerability particularly affects organizations that depend on Forcepoint's web security solutions for content filtering and threat protection, making it a critical concern for enterprise security teams.
Organizations should immediately implement mitigations including updating to Forcepoint Web Security Content Gateway version 8.5.4 or later, which contains the necessary patches to address the XML processing flaw. Network administrators should also consider implementing additional monitoring and logging mechanisms to detect potential exploitation attempts, as the vulnerability may be leveraged in conjunction with other attack vectors. The mitigation strategy should align with industry best practices for vulnerability management and security hardening, following frameworks such as those recommended by the Center for Internet Security (CIS) and the National Institute of Standards and Technology (NIST) guidelines. Security teams should also conduct thorough assessments of their web security infrastructure to identify any potential indirect impacts from this vulnerability and ensure comprehensive protection of their network assets. This vulnerability demonstrates the importance of proper input validation and sanitization in security appliances, as highlighted by CWE-20 standards for improper input validation and ATT&CK techniques related to information gathering and credential access.