CVE-2021-20224 is an integer overflow issue found in ImageMagick's ExportIndexQuantum() function within the source file MagickCore/quantum-export.c. This vulnerability allows function calls to GetPixelIndex() to produce values that exceed the range representable for the 'unsigned char'. As a result, when ImageMagick processes a specially crafted PDF file, it could lead to undefined behavior or a crash. The CVSS score for this vulnerability is 5.5, indicating a medium severity level.
Risk to organizations includes potential service interruptions or crashes of applications relying on ImageMagick for image processing. This vulnerability could be exploited in environments where user input is processed, particularly with crafted PDF files. Given the nature of the attack vector being local and requiring user interaction, attackers may leverage this vulnerability in targeted attacks.
Organizations should prioritize patching immediately. The vulnerability affects multiple versions of ImageMagick, and it is essential to ensure that any installations are updated to the latest secure versions to mitigate the risks associated with this vulnerability.
The vulnerability was published on August 25, 2022, and has been modified since its initial disclosure. Continuous monitoring and timely patching are crucial for maintaining security in environments utilizing ImageMagick.
Vulnerability Details
The integer overflow in ImageMagick's ExportIndexQuantum() is classified under CWE-190. The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating a low attack complexity with no privileges required but requiring user interaction.
Technical Analysis
The root cause of this vulnerability stems from improper handling of integer values in the ExportIndexQuantum() function, which can allow for manipulation of pixel index values beyond the allowable range. This can occur when processing local files, specifically crafted PDF documents, leading to potential crashes or undefined behavior.
The attack complexity is classified as low, making it accessible for exploitation. No special privileges are required to exploit this vulnerability, but it necessitates user interaction during the file processing. The impact on availability is assessed as high, indicating a significant risk of service disruption.
Risk & Impact Analysis
Organizations utilizing ImageMagick for image processing tasks face real-world risks associated with this vulnerability. The potential for crashes during the processing of user-uploaded files could lead to service interruptions, affecting user experience and operational continuity. The blast radius includes any application that leverages ImageMagick, emphasizing the need for prompt remediation.
Given that the CVSS score is 5.5, organizations should address this vulnerability in their priority patch cycle. Monitoring for any unusual behavior or crashes associated with image processing should also be implemented as part of a comprehensive security posture.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects ImageMagick versions prior to 6.9.11-57 and from version 7.0.0-0 to less than 7.0.10-57. It is vital for organizations to verify their versions and ensure they are updated accordingly to mitigate this vulnerability's impact.
Mitigation & Remediation
Organizations should implement the following remediation steps: apply the latest patches available from ImageMagick, ensuring that systems are upgraded to a version that addresses this vulnerability. If immediate patching is not possible, organizations should restrict access to the components that utilize ImageMagick for processing user-uploaded files.
For comprehensive security, organizations may consider engaging in penetration testing to evaluate their overall security posture and identify any additional vulnerabilities.
Regular monitoring of logs and user interaction with the application can help identify any unusual patterns that may indicate attempts to exploit this vulnerability.
Detection Guidance
Organizations should monitor logs for any indicators of exploitation related to ImageMagick. Key indicators include errors during the processing of PDF files, unexpected application crashes, or performance degradation during image processing tasks. Additionally, behavioral anomalies during user interactions with the application should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-20224 lies in its representation of vulnerabilities that arise from improper input handling in widely-used libraries, highlighting the ongoing need for vigilance in code reviews and vulnerability assessments.
Organizations should learn from this incident to strengthen their security protocols, ensuring robust input validation and error handling in their applications. The trend indicates that vulnerabilities related to image processing libraries may continue to pose risks, necessitating proactive security measures.
For further insights on securing applications against similar vulnerabilities, organizations can refer to resources on vulnerability management programs, which help mitigate risks effectively.
Additionally, engaging in penetration testing can provide insights into potential weaknesses in the system architecture.
Ultimately, maintaining an adaptive security strategy is crucial for staying ahead of emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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