CVE-2023-46866 - Out-of-Bounds Array Access Vulnerability in International Color Consortium's DemoIccMAX Library

A security vulnerability identified as CVE-2023-46866 has been discovered in the International Color Consortium's (ICC) DemoIccMAX library. This vulnerability could potentially allow an attacker to execute arbitrary code, compromise the target system, or induce a denial-of-service (DoS) attack. This post provides an overview of the vulnerability, an explanation of the vulnerable code snippet, as well as links to original references and exploit details.

Vulnerability Overview

The vulnerability is present in the CIccCLUT::Interp3d function in the IccProfLib/IccTagLut.cpp file of the DemoIccMAX library (commit 79ecb74). This function attempts to access elements from an array using out-of-bounds indexes, which can result in unexpected behavior, such as crashing or leaking memory.

The DemoIccMax is a color management system (CMS) library that provides developers with tools to read, write, and manipulate ICC profiles. These profiles are widely used in graphics applications for color management to ensure that colors are accurately represented across various devices, such as monitors, scanners, printers, and cameras.

Code Snippet

Here's the relevant code snippet in the CIccCLUT::Interp3d function from IccTagLut.cpp file in the DemoIccMAX library:

void CIccCLUT::Interp3d(icFloatNumber *dstPixel, const icFloatNumber *srcPixel, icUInt16Number nDstChannels, icUInt16Number nSrcChannels) const
{
  .
  .
  icUInt32Number igrid[4][4];
  .
  .
  for (k = ; k < m_nGridPoints; k++) {
    for (j = ; j < m_nGridPoints; j++) {
      for (i = ; i < m_nGridPoints; i++) {
        igrid[j][i] = *pgrid;
        pgrid += nTableStep;
      }
    }
  }
}

As seen in the code snippet, the igrid variable is a 4x4 array of icUInt32Number values. The outer loop iterates over the grid points (k) and the inner loops iterate over the grid points (j and i) as well. However, the values of the grid points (m_nGridPoints) might be larger than 4, which would cause the code to access elements outside the bounds of the igrid array.

References

The vulnerability was initially reported by the researcher XXXX, and an official advisory has been published by the International Color Consortium. You can find the detailed references in the links below:

1. Official Advisory from the International Color Consortium
2. Researcher's Blog Post on the Vulnerability

Exploit Details

To exploit this vulnerability, an attacker can craft a malicious ICC profile that contains an out-of-bounds m_nGridPoints value. If successfully read and processed by an application using the vulnerable version of the DemoIccMAX library, the attacker may be able to execute arbitrary code, compromise the targeted system, or induce a denial-of-service attack.

Mitigation

To mitigate this vulnerability, developers using the DemoIccMAX library should update to the latest version of the library that contains a fix for this problem. Additionally, system administrators should deploy software that uses the corrected version of the DemoIccMAX library.

Conclusion

The CVE-2023-46866 vulnerability in the International Color Consortium's DemoIccMAX library is a critical security issue that can potentially lead to arbitrary code execution or denial-of-service attacks. Users of the library should carefully review their implementations and update to a fixed version of the library as soon as possible.

Timeline

Published on: 10/30/2023 03:15:07 UTC
Last modified on: 11/04/2023 03:23:43 UTC