CVE-2021-39819 : Exploit Details and Defense Strategies
Understand the Adobe InCopy memory corruption vulnerability CVE-2021-39819. Learn about impact, affected versions, exploitation, mitigation steps, and long-term prevention.
Adobe InCopy version 11.1 (and earlier) is affected by a memory corruption vulnerability. This could lead to arbitrary code execution with high impact and low attack complexity.
Understanding CVE-2021-39819
Adobe InCopy has a critical memory corruption vulnerability that may allow an attacker to execute arbitrary code through the manipulation of a malicious XML file, requiring user interaction for exploitation.
What is CVE-2021-39819?
The CVE-2021-39819 vulnerability in Adobe InCopy stems from inadequate processing of specific files, potentially enabling an attacker to trigger arbitrary code execution in the user's context, emphasizing the importance of vigilant file handling practices.
The Impact of CVE-2021-39819
The vulnerability poses severe risks with a CVSS base score of 7.8, leading to high confidentiality, integrity, and availability impact without any privileged access requirements, necessitating immediate attention and mitigation.
Technical Details of CVE-2021-39819
Adobe InCopy's vulnerability involves memory corruption and its exploitation mechanics.
Vulnerability Description
The flaw arises from insecure handling of XML files in Adobe InCopy, enabling an attacker to potentially inject and execute arbitrary code through crafted files, exploiting system memory vulnerabilities.
Affected Systems and Versions
- Product: InCopy
- Vendor: Adobe
- Affected Versions: <= 16.3, 16.3.1, None
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Local
- User Interaction: Required
- Privileges Required: None
Mitigation and Prevention
Protecting systems from CVE-2021-39819 requires immediate actions and ongoing security measures.
Immediate Steps to Take
- Update Adobe InCopy to version 16.3.2 or the latest available patch to mitigate the vulnerability.
- Exercise caution when handling files, especially those from untrusted sources that could potentially exploit this vulnerability.
Long-Term Security Practices
- Implement strict file validation mechanisms to prevent the execution of malicious files.
- Educate users on safe file handling practices and the risks associated with unauthorized file executions.
Patching and Updates
- Regularly monitor vendor security updates and apply patches promptly to address any newly identified vulnerabilities in Adobe InCopy.