CVE-2023-46250 : What You Need to Know

A vulnerability has been identified in the pypdf library that allows an attacker to create a PDF file triggering an infinite loop, causing high CPU usage. This CVE affects versions 3.7.0 through 3.16.4, with a fix available in version 3.17.0.

Understanding CVE-2023-46250

This section delves into the specifics of the CVE-2023-46250 vulnerability in the pypdf library.

What is CVE-2023-46250?

The CVE-2023-46250 vulnerability in pypdf library allows an attacker to exploit versions 3.7.0 through 3.16.4 by creating a PDF that triggers an infinite loop, leading to a CPU spike. This issue was assigned the CWE-835, which denotes 'Loop with Unreachable Exit Condition.'

The Impact of CVE-2023-46250

The vulnerability can be exploited to cause a denial of service (DoS) condition on systems running the affected versions of pypdf. By utilizing a single CPU core at 100%, the infinite loop hinders the normal operation of the affected process.

Technical Details of CVE-2023-46250

This section covers the technical aspects of CVE-2023-46250 in the pypdf library.

Vulnerability Description

The issue arises when a malicious PDF file is processed by pypdf, causing the software to enter an infinite loop, consuming CPU resources. It poses a risk of DoS as it directly impacts system performance.

Affected Systems and Versions

The CVE affects pypdf versions between 3.7.0 and 3.16.4. Systems running these versions are vulnerable to the infinite loop exploitation.

Exploitation Mechanism

An attacker can exploit the CVE-2023-46250 by creating a PDF file that triggers the infinite loop when processed by pypdf, thereby impacting system performance significantly.

Mitigation and Prevention

In this section, the steps to mitigate the CVE-2023-46250 vulnerability are discussed.

Immediate Steps to Take

To mitigate the risk associated with CVE-2023-46250, users are advised to update to pypdf version 3.17.0 or later. Alternatively, apply the provided patch manually by modifying the specified file.

Long-Term Security Practices

Regularly updating software to the latest versions, following secure coding practices, and implementing input validation can help prevent similar vulnerabilities in the future.

Patching and Updates

Developers should stay informed about security advisories and promptly apply patches released by the pypdf maintainers to address known vulnerabilities.