CVE-2020-15389 : Exploit Details and Defense Strategies

OpenJPEG through 2.3.1 has a use-after-free vulnerability in jp2/opj_decompress.c that can lead to a double-free scenario when handling directories with a mix of valid and invalid files.

Understanding CVE-2020-15389

This CVE involves a critical use-after-free vulnerability in OpenJPEG that can result in a double-free condition, potentially leading to exploitation.

What is CVE-2020-15389?

OpenJPEG through version 2.3.1 is susceptible to a use-after-free flaw in the jp2/opj_decompress.c component. This vulnerability arises when the decompressor processes a directory containing a combination of valid and invalid files, potentially triggering a double-free condition by calling opj_image_destroy twice.

The Impact of CVE-2020-15389

The exploitation of this vulnerability could allow an attacker to execute arbitrary code, leading to a denial of service (DoS) or potentially enabling further malicious activities on the affected system.

Technical Details of CVE-2020-15389

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability in jp2/opj_decompress.c in OpenJPEG through 2.3.1 allows for a use-after-free scenario triggered by a mix of valid and invalid files in a directory, potentially leading to a double-free condition.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to and including 2.3.1

Exploitation Mechanism

The vulnerability can be exploited by an attacker placing a combination of valid and invalid files in a directory processed by the OpenJPEG decompressor, leading to the triggering of a double-free condition.

Mitigation and Prevention

Protecting systems from CVE-2020-15389 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Restrict access to vulnerable systems and directories.
Monitor for any unusual or suspicious activities on the network.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Conduct security training for personnel to enhance awareness of potential threats.
Implement network segmentation to limit the impact of potential breaches.

Patching and Updates

Ensure that the OpenJPEG software is updated to version 2.3.2 or later to address the use-after-free vulnerability and prevent the exploitation of CVE-2020-15389.