CVE-2005-3737 in inkscape
Summary
by MITRE
Buffer overflow in the SVG importer (style.cpp) of inkscape 0.41 through 0.42.2 might allow remote attackers to execute arbitrary code via a SVG file with long CSS style property values.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2005-3737 represents a critical buffer overflow flaw within the Scalable Vector Graphics importer functionality of Inkscape versions 0.41 through 0.42.2. This issue specifically affects the style.cpp component of the software's SVG parsing engine, where insufficient input validation allows maliciously crafted SVG files to trigger memory corruption conditions. The vulnerability stems from the application's failure to properly bounds-check CSS style property values when processing SVG documents, creating an exploitable condition that can be leveraged by remote attackers to gain arbitrary code execution privileges on affected systems.
The technical implementation of this buffer overflow occurs during the parsing of CSS style attributes within SVG elements, where the application allocates fixed-size buffers to store style property values without adequate verification of input length. When an attacker crafts a malicious SVG file containing excessively long CSS style properties, the parsing routine fails to validate the length of these values against the allocated buffer boundaries. This fundamental flaw in input sanitization creates a classic stack-based buffer overflow condition that can be exploited to overwrite adjacent memory locations including return addresses and control data. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a prime example of unsafe string handling practices that have been consistently identified as high-risk security flaws in software development.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete system compromise capabilities when successfully exploited. Remote attackers can leverage this vulnerability to execute arbitrary code with the privileges of the Inkscape process, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. The vulnerability affects users who process untrusted SVG files, making it particularly dangerous in environments where document sharing occurs frequently, such as collaborative design platforms, online publishing systems, or web-based vector graphics applications. This makes the vulnerability particularly concerning for organizations that rely on SVG file processing or those that may inadvertently encounter malicious SVG content in email attachments, web downloads, or collaborative work environments. The exploitability of this vulnerability is enhanced by the fact that it requires no special privileges to trigger, making it accessible to attackers with minimal technical expertise.
Mitigation strategies for CVE-2005-3737 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The primary and most effective mitigation is the immediate upgrade to Inkscape versions 0.43 and later, which contain fixed implementations of the SVG parsing engine with proper bounds checking and input validation. Organizations should also implement defensive measures including sandboxing SVG processing environments, implementing strict file format validation, and deploying content filtering systems that can detect and block potentially malicious SVG files. Additionally, security practitioners should consider implementing network-based intrusion detection systems that can identify patterns associated with exploitation attempts, and establish comprehensive patch management procedures to ensure timely deployment of security updates. The vulnerability serves as a reminder of the importance of input validation and the critical need for memory-safe programming practices, aligning with ATT&CK technique T1059.007 for execution through scripting and T1203 for exploitation for privilege escalation, emphasizing the need for robust application security controls throughout the software development lifecycle.