CVE-2020-5679 in EC-CUBE
Summary
by MITRE • 12/03/2020
Improper restriction of rendered UI layers or frames in EC-CUBE versions from 3.0.0 to 3.0.18 leads to clickjacking attacks. If a user accesses a specially crafted page while logged into the administrative page, unintended operations may be conducted.
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Analysis
by VulDB Data Team • 12/12/2020
The vulnerability identified as CVE-2020-5679 represents a critical security flaw in the EC-CUBE e-commerce platform affecting versions 3.0.0 through 3.0.18. This issue stems from improper restriction of rendered user interface layers or frames, creating a dangerous condition that allows malicious actors to exploit the administrative interface through clickjacking techniques. The vulnerability specifically targets the administrative pages of the EC-CUBE system, where users with valid login credentials are susceptible to unauthorized operations when visiting maliciously crafted web pages.
The technical implementation of this vulnerability involves the failure to properly implement security mechanisms that would prevent the administrative interface from being embedded within other web pages or frames. This lack of proper frame restriction allows attackers to create deceptive web pages that overlay legitimate administrative interfaces with malicious content, making it appear as though users are interacting with trusted administrative functions while actually performing unintended actions. The flaw directly relates to CWE-1021, which describes improper restriction of UI layers or frames, and aligns with ATT&CK technique T1059.005 for user execution through malicious content.
When a user with administrative privileges accesses a specially crafted page while logged into the EC-CUBE administrative interface, the clickjacking attack can result in unauthorized operations being performed without the user's knowledge or consent. This includes potentially destructive actions such as modifying product information, changing user permissions, accessing sensitive data, or performing financial transactions. The attack vector exploits the trust relationship between the user and the administrative interface, leveraging the user's authenticated session to execute malicious commands.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can lead to complete compromise of the administrative system and potentially the entire e-commerce platform. Attackers can manipulate the administrative interface to redirect users to malicious pages, modify critical system configurations, or extract sensitive customer data. The vulnerability is particularly dangerous because it requires no additional authentication beyond the existing administrative session, making it an effective method for gaining unauthorized control over the system.
Mitigation strategies for CVE-2020-5679 should include immediate implementation of the frame-busting techniques recommended by OWASP, such as implementing the X-Frame-Options header with the DENY or SAMEORIGIN values to prevent the administrative interface from being embedded in external pages. Organizations should also implement Content Security Policy headers that restrict frame loading from external sources. Additionally, the affected EC-CUBE versions must be upgraded to patched releases that properly address the UI layer restriction issue. Security teams should conduct thorough penetration testing to verify that the administrative interface cannot be successfully embedded or overlaid by external content, and implement proper session management controls to reduce the impact of any potential successful attacks.