CVE-2023-21613 : Security Advisory and Response

This CVE-2023-21613 advisory discusses an out-of-bounds read information disclosure vulnerability in Adobe Acrobat Reader DC Font Parsing.

Understanding CVE-2023-21613

Adobe Acrobat Reader versions 22.003.20282 (and earlier), 22.003.20281 (and earlier), and 20.005.30418 (and earlier) are vulnerable to an out-of-bounds read vulnerability. This flaw could potentially expose sensitive memory, allowing an attacker to bypass mitigations like ASLR. Exploiting this vulnerability requires user interaction as the victim needs to open a malicious file.

What is CVE-2023-21613?

The CVE-2023-21613 vulnerability in Adobe Acrobat Reader DC Font Parsing relates to an out-of-bounds read issue that could lead to the disclosure of sensitive memory.

The Impact of CVE-2023-21613

The impact of this vulnerability is rated as medium severity based on the CVSS v3.1 score of 5.5. The confidentiality of the system is at high risk, although integrity and availability are not impacted.

Technical Details of CVE-2023-21613

The following technical details provide a deeper insight into the vulnerability:

Vulnerability Description

The vulnerability is categorized as an Out-of-bounds Read (CWE-125), allowing unauthorized access to memory beyond the boundaries of an allocated buffer.

Affected Systems and Versions

Adobe Acrobat Reader versions 22.003.20282, 22.003.20281, and 20.005.30418 are affected. Specifically, versions equal to or older than these specified versions are vulnerable to exploitation.

Exploitation Mechanism

To exploit this vulnerability, an attacker would need to craft a malicious file and entice a user to open it. Once the file is opened, the attacker could potentially gain access to sensitive memory information.

Mitigation and Prevention

Addressing CVE-2023-21613 requires a comprehensive approach to mitigate the risks associated with the vulnerability.

Immediate Steps to Take

Users are advised to update their Adobe Acrobat Reader to the latest version to patch the vulnerability. Additionally, exercising caution while opening files from untrusted sources can help prevent exploitation.

Long-Term Security Practices

It is essential to regularly update software and apply patches promptly to protect systems from known vulnerabilities. Implementing robust security measures and user training on recognizing and avoiding suspicious files can enhance overall security posture.

Patching and Updates

Adobe has provided a security advisory detailing the vulnerability and necessary patches. Users are encouraged to refer to the advisory and apply the recommended updates to secure their systems.