CVE-2004-0597 in SVG Viewer
Summary
by MITRE
Multiple buffer overflows in libpng 1.2.5 and earlier, as used in multiple products, allow remote attackers to execute arbitrary code via malformed PNG images in which (1) the png_handle_tRNS function does not properly validate the length of transparency chunk (tRNS) data, or the (2) png_handle_sBIT or (3) png_handle_hIST functions do not perform sufficient bounds checking.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability described in CVE-2004-0597 represents a critical security flaw in libpng version 1.2.5 and earlier, affecting numerous software products that rely on this widely-used library for handling png image files. This vulnerability stems from improper input validation mechanisms within the library's handling of png transparency chunks and related data structures, creating opportunities for remote code execution through maliciously crafted image files. The flaw specifically targets three distinct functions within the library's png handling code, each demonstrating different aspects of insufficient bounds checking that collectively enable attackers to exploit buffer overflow conditions.
The technical implementation of this vulnerability involves three primary attack vectors that exploit different aspects of the png file parsing process. The first vector targets the png_handle_tRNS function which fails to properly validate the length of transparency chunk data, allowing attackers to manipulate the expected data size and subsequently overflow the allocated buffer. The second and third vectors target png_handle_sBIT and png_handle_hIST functions respectively, both of which lack adequate bounds checking mechanisms for their respective data structures. These functions process bit-depth information and histogram data from png files without sufficient validation of input parameters, creating opportunities for attackers to trigger memory corruption through carefully crafted malformed data sequences. All three functions demonstrate the classic buffer overflow pattern where insufficient boundary checks allow attackers to write beyond allocated memory regions.
The operational impact of CVE-2004-0597 extends far beyond simple denial of service conditions, as the vulnerability enables remote code execution with the privileges of the affected application. This represents a severe security risk for any system that processes png images from untrusted sources, including web servers, image processing applications, and content management systems. Attackers can leverage these buffer overflows to inject and execute arbitrary code, potentially leading to complete system compromise and unauthorized access to sensitive data. The vulnerability affects a broad range of software products that utilize libpng for image processing, making it particularly dangerous in environments where png files are frequently processed from external sources.
The exploitation of this vulnerability aligns with several attack patterns documented in the attack tree framework, particularly those involving code injection and memory corruption techniques. From a cybersecurity perspective, this vulnerability demonstrates the importance of proper input validation and bounds checking in security-critical libraries, as outlined in common weakness enumeration CWE-121 and CWE-125 which specifically address buffer overflow conditions. The vulnerability also relates to attack techniques categorized under the attack pattern taxonomy where adversaries leverage software flaws to execute malicious code through image processing pipelines. Organizations implementing security controls should consider this vulnerability when evaluating their application security posture and implementing defense-in-depth strategies.
Mitigation strategies for CVE-2004-0597 require immediate action to upgrade affected systems to libpng versions 1.2.6 or later, where the buffer overflow conditions have been addressed through proper bounds checking and input validation mechanisms. System administrators should implement network segmentation and access controls to limit exposure to untrusted image sources, while also deploying intrusion detection systems to monitor for exploitation attempts. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all systems that may be affected by this vulnerability, particularly those that process png images from external sources. Regular security updates and patch management procedures should be implemented to ensure timely remediation of similar vulnerabilities in the future, as this type of flaw represents a recurring pattern in software security that requires continuous vigilance and proactive defense measures.