CVE-2023-45853 : Security Advisory and Response

MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. pyminizip through 0.2.6 is also vulnerable as it bundles an affected zlib version.

Understanding CVE-2023-45853

This CVE involves an integer overflow and heap-based buffer overflow in MiniZip, impacting zlib through version 1.3.

What is CVE-2023-45853?

CVE-2023-45853 highlights a vulnerability in MiniZip in zlib, resulting in a heap-based buffer overflow when processing long filenames, comments, or extra fields. This vulnerability can be exploited by an attacker to trigger unexpected behavior or potentially execute arbitrary code.

The Impact of CVE-2023-45853

The impact of this CVE is significant as it exposes systems utilizing affected zlib and pyminizip versions to potential exploitation. Malicious actors could leverage this vulnerability to compromise the integrity and security of the affected systems.

Technical Details of CVE-2023-45853

This section provides an overview of the vulnerability details, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability in MiniZip in zlib through version 1.3 is due to an integer overflow, leading to a heap-based buffer overflow in the zipOpenNewFileInZip4_64 function. When processing overly long filenames, comments, or extra fields, the overflow occurs, posing a security risk.

Affected Systems and Versions

The vulnerability affects systems utilizing zlib versions up to 1.3 and pyminizip through version 0.2.6. Organizations using these versions are advised to take immediate action to mitigate potential risks.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by crafting specially designed inputs, such as long filenames, comments, or extra fields, to trigger the overflow condition. This exploitation can lead to unauthorized access, data breaches, and system compromise.

Mitigation and Prevention

To address CVE-2023-45853, organizations should implement immediate steps, adopt long-term security practices, and prioritize patching and updates.

Immediate Steps to Take

Update zlib and pyminizip to non-vulnerable versions or apply patches provided by the respective vendors.
Monitor network traffic and system logs for any suspicious activity that could indicate exploitation attempts.
Educate users and IT staff on security best practices to prevent social engineering attacks that exploit vulnerabilities.

Long-Term Security Practices

Regularly update software and libraries to maintain a secure computing environment.
Conduct security assessments and penetration testing to identify and address potential vulnerabilities proactively.
Implement network segmentation and access controls to limit the impact of successful attacks on critical systems.

Patching and Updates

Refer to the official vendor advisories and security bulletins for detailed information on patches and updates available for zlib and pyminizip. Promptly apply recommended fixes to safeguard your systems against CVE-2023-45853.