This vulnerability allows an integer truncation in the libpng simplified write API functions png_write_image_16bit and png_write_image_8bit. Specifically, it affects versions 1.6.26 through 1.6.53 of the libpng library, which is widely used for handling PNG (Portable Network Graphics) raster image files. The vulnerability can lead to a heap buffer over-read when a negative row stride is provided or when the stride exceeds 65535 bytes. This issue has been addressed in version 1.6.54.
The CVSS score for this vulnerability is 6.8, classifying it as medium severity. This indicates that while it poses a risk, it may not be as critical as higher-severity vulnerabilities. However, organizations should still take appropriate actions to mitigate the risk associated with this vulnerability.
Risk to organizations includes potential unauthorized access to sensitive data and the ability to disrupt services, especially when the impacted library is used in applications processing image files. Attackers may leverage this vulnerability to exploit applications that utilize affected versions of libpng, leading to possible data leaks or application crashes.
Organizations should prioritize patching immediately. It is essential to update to version 1.6.54 or later to mitigate this vulnerability effectively.
Vulnerability Details
The vulnerability originates from an integer truncation issue in the libpng library, particularly affecting the png_write_image_16bit and png_write_image_8bit functions. When a negative row stride or an excessively large stride is provided, a heap buffer over-read occurs. This bug was introduced in libpng version 1.6.26 and stems from casts added to silence compiler warnings on 16-bit systems.
This vulnerability is classified under CWE-125 (Out-of-bounds Read) and CWE-190 (Integer Overflow or Wraparound). It highlights the importance of careful type management and boundary checking in the development of libraries that handle complex data structures such as images.
The CVSS vector string for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H. The availability impact is rated as high, indicating that a successful exploit could render the application inoperable, leading to potential downtime.
Organizations using affected versions should take immediate action to upgrade to the patched version 1.6.54 or later to ensure continued security.
Technical Analysis
The root cause of this vulnerability stems from improper handling of integer values within the libpng library's API functions. The attack vector is local, meaning that an attacker must have access to the system running the vulnerable library. Attack complexity is low, as successful exploitation does not require any specialized skills or extensive knowledge of the library.
In terms of privileges required, none are needed for an attacker to exploit this vulnerability. User interaction is not required either, allowing potential attackers to exploit the vulnerability with minimal effort.
The confidentiality impact is low, as it does not directly expose sensitive information. The integrity impact is none, indicating that there is no alteration of data. However, the availability impact is high, as the exploit could lead to denial of service conditions.
Risk & Impact Analysis
Real-world deployment risk for this vulnerability is significant, especially for applications that rely heavily on libpng for image processing. The potential for service disruption due to heap buffer over-reads can lead to downtime, affecting user experience and potentially damaging organizational reputation.
Why this matters to organizations is underscored by the widespread usage of the libpng library in various applications. The blast radius of this vulnerability could extend to any software that depends on libpng, creating a multi-faceted risk landscape.
Given the CVSS score of 6.8, organizations are advised to address this vulnerability in their priority patch cycle. Immediate action is warranted to eliminate any risk of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of libpng are from 1.6.26 to 1.6.53. Organizations should ensure that they have upgraded to version 1.6.54 or later to mitigate this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to libpng version 1.6.54 or later. If upgrading is not immediately possible, consider implementing workarounds by validating input parameters to prevent negative row strides and excessive stride lengths. Additionally, organizations can configure their systems to monitor and log API calls to detect any anomalous behavior.
For ongoing security assurance, organizations may consider engaging in penetration testing to identify similar weaknesses in their applications.
Detection Guidance
Organizations should monitor logs for any unusual API calls related to image processing. Behavioral anomalies during file operations, particularly those involving image manipulation, should be investigated. Consider implementing network signatures to detect attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability represents a critical reminder of the need for thorough validation in library development. The pattern of integer truncation vulnerabilities has been observed across various libraries and applications, calling for increased scrutiny in coding practices. Security teams should take lessons from this incident to enhance their review processes and ensure robust security measures.
For more insights on secure coding practices, organizations can refer to the secure coding practices guide. Understanding the common pitfalls in library development will help organizations mitigate similar risks.
Moreover, the ongoing evolution of vulnerabilities necessitates regular updates to security protocols. Engaging in penetration testing methodology will provide organizations with a framework to assess their defenses against potential exploitation.
Finally, organizations should keep abreast of trends in vulnerabilities by following industry reports and insights. Resources like the vulnerability management program can guide security teams in developing robust strategies to manage and respond to vulnerabilities effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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