CVE-2020-7303 in Data Loss Prevention
Summary
by MITRE
Cross Site scripting vulnerability in McAfee Data Loss Prevention (DLP) ePO extension prior to 11.5.3 allows authenticated remote user to trigger scripts to run in a user's browser via adding a new label.
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Analysis
by VulDB Data Team • 11/09/2020
The vulnerability CVE-2020-7303 represents a critical cross site scripting flaw within McAfee Data Loss Prevention ePO extension versions prior to 11.5.3. This security weakness specifically affects the administrative interface of the DLP solution, creating a dangerous attack vector that enables authenticated remote users to execute malicious scripts in the context of other users' browsers. The vulnerability stems from insufficient input validation and output encoding mechanisms within the label creation functionality of the ePO extension, which processes user-supplied data without proper sanitization before rendering it in web responses. The attack requires an authenticated user with appropriate privileges to create or modify labels, making it particularly concerning as it leverages legitimate administrative capabilities to deliver malicious payloads. This type of vulnerability falls under CWE-79 which specifically addresses cross site scripting flaws, where web applications fail to properly validate or encode user input before incorporating it into dynamic web content. The operational impact extends beyond simple script execution as it enables attackers to potentially steal session cookies, perform unauthorized actions on behalf of victims, or redirect users to malicious sites, thereby compromising the integrity and confidentiality of the DLP environment. The vulnerability is particularly dangerous in enterprise settings where DLP solutions are used to protect sensitive data, as successful exploitation could allow attackers to bypass data protection measures and gain access to protected information. According to ATT&CK framework, this vulnerability maps to T1059.001 which covers command and scripting interpreter, and T1566 which encompasses spearphishing with malicious attachments or links, as the XSS payload could be used to deliver additional malware or phishing content. The attack scenario involves an authenticated user creating a malicious label with embedded JavaScript code that executes when other users view or interact with the label within the DLP interface, creating a persistent threat that can be used for credential theft, privilege escalation, or data exfiltration. Organizations using affected versions of McAfee DLP should immediately implement the vendor-provided patch to address this vulnerability and consider implementing additional monitoring for suspicious label creation activities as a defensive measure. The vulnerability highlights the importance of proper input validation and output encoding in web applications, particularly in administrative interfaces where users have elevated privileges and can potentially cause significant damage through exploitation of such flaws.