CVE-2021-46822 : Vulnerability Insights and Analysis

This CVE involves a vulnerability in the PPM reader of libjpeg-turbo through version 2.0.90, leading to a heap-based buffer overflow.

Understanding CVE-2021-46822

This CVE highlights critical mishandling in loading 16-bit binary PPM and PGM files, potentially causing a heap-based buffer overflow in rdppm.c.

What is CVE-2021-46822?

The flaw in the PPM reader of libjpeg-turbo through 2.0.90 can be exploited to trigger a heap-based buffer overflow when handling certain types of image files.

The Impact of CVE-2021-46822

The vulnerability could allow an attacker to execute arbitrary code or crash the application, compromising the integrity and availability of systems using the affected library.

Technical Details of CVE-2021-46822

The issue involves the following technical aspects:

Vulnerability Description

An issue in tjLoadImage for loading 16-bit binary PPM files into a grayscale buffer and 16-bit binary PGM files into an RGB buffer.
Heap-based buffer overflow in the get_word_rgb_row function in rdppm.c.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: All versions up to 2.0.90

Exploitation Mechanism

Attackers can exploit specially crafted 16-bit binary PPM and PGM files to trigger the buffer overflow, potentially leading to code execution or denial of service.

Mitigation and Prevention

It is crucial to take immediate and long-term steps to mitigate the risks posed by CVE-2021-46822.

Immediate Steps to Take

Update libjpeg-turbo to a patched version that addresses the vulnerability.
Consider implementing proper input validation mechanisms to prevent malicious file uploads.

Long-Term Security Practices

Regularly monitor for security advisories and updates related to libjpeg-turbo.
Employ secure coding practices to prevent buffer overflows and other memory corruption vulnerabilities.

Patching and Updates

Patch or upgrade libjpeg-turbo to version 2.0.91 or a later release to eliminate the vulnerability.