CVE-2021-21084 : Exploit Details and Defense Strategies
Learn about CVE-2021-21084, a high-severity XSS vulnerability in Adobe Experience Manager versions 6.3.3.8, 6.4.8.3, 6.5.7.0, and AEM Cloud Service. Understand the impact, technical details, and mitigation steps.
Adobe Experience Manager stored a cross-site scripting vulnerability that could lead to arbitrary code execution. Here's a detailed breakdown:
Understanding CVE-2021-21084
This CVE involves Adobe Experience Manager versions 6.5.7.0 and below, 6.4.8.3 and below, 6.3.3.8 and below, as well as AEM Cloud Service.
What is CVE-2021-21084?
A stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager allows attackers to inject malicious scripts into form fields, enabling the execution of malicious JavaScript in victims' browsers.
The Impact of CVE-2021-21084
With a CVSS base score of 7.3, the vulnerability has a high severity rating. Attackers can compromise confidentiality and integrity, requiring user interaction for exploitation.
Technical Details of CVE-2021-21084
Adobe Experience Manager is susceptible to stored XSS attacks, affecting various versions. Here are the specifics:
Vulnerability Description
The vulnerability stems from the resource resolver factory, allowing threat actors to execute arbitrary code through injected scripts.
Affected Systems and Versions
Versions 6.3.3.8, 6.4.8.3, 6.5.7.0, and AEM Cloud Service are impacted by this security flaw.
Exploitation Mechanism
Exploiting this flaw involves injecting malicious scripts into vulnerable form fields, triggering the execution of unauthorized JavaScript.
Mitigation and Prevention
Take immediate precautions and adopt long-term security practices to mitigate the risks posed by CVE-2021-21084:
Immediate Steps to Take
- Apply patches and security updates promptly.
- Implement input validation and output encoding to prevent XSS attacks.
- Monitor and restrict user input to sanitize data and prevent script injection.
Long-Term Security Practices
- Conduct regular security audits and assessments to identify vulnerabilities.
- Educate users and developers about secure coding practices and the risks of XSS attacks.
Patching and Updates
Stay informed about security advisories from Adobe and apply relevant patches to secure Adobe Experience Manager systems.