CVE-2006-3372 in Safari
Summary
by MITRE
Apple Safari 2.0.4/419.3 allows remote attackers to cause a denial of service (application crash) via a DHTML setAttributeNode function call with zero arguments, which triggers a null dereference.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 06/21/2025
The vulnerability described in CVE-2006-3372 represents a classic null pointer dereference flaw that affects Apple Safari versions 2.0.4 and 419.3. This issue manifests when the browser processes a DHTML setAttributeNode function call that contains zero arguments, leading to an application crash. The vulnerability stems from insufficient input validation within the browser's JavaScript engine, specifically in how it handles malformed function calls that lack required parameters. When the setAttributeNode method receives no arguments, the underlying code attempts to dereference a null pointer, causing the browser to terminate unexpectedly. This type of vulnerability falls under the CWE-476 category of NULL Pointer Dereference, which is a well-documented weakness in software development where programs attempt to access memory through a null reference. The flaw demonstrates a fundamental lack of proper error handling and input sanitization in the browser's JavaScript implementation, creating an exploitable condition that remote attackers can leverage to disrupt normal browser operations.
The operational impact of this vulnerability extends beyond simple application instability, as it provides attackers with a reliable method for causing denial of service against Safari users. When exploited, the vulnerability can be triggered through malicious web pages that contain crafted JavaScript code, making it particularly dangerous in web-based attack scenarios. The remote nature of the exploit means that users do not need to interact with malicious content directly, as simply visiting a compromised webpage can trigger the vulnerability. This characteristic aligns with ATT&CK technique T1499.004 for network denial of service attacks, where adversaries leverage application-level vulnerabilities to disrupt services. The vulnerability's exploitation requires minimal technical expertise from attackers, as it only necessitates the ability to inject malicious JavaScript into web pages. The resulting application crash not only interrupts user browsing sessions but also potentially exposes the browser to further exploitation opportunities if the crash occurs during critical processing phases.
Mitigation strategies for CVE-2006-3372 should focus on immediate patch deployment and defensive programming practices. The most effective solution involves updating to a patched version of Safari that properly validates function arguments before processing them, preventing the null pointer dereference from occurring. Organizations should implement browser security policies that restrict access to untrusted websites and consider deploying web application firewalls that can detect and block malicious JavaScript patterns. From a defensive programming perspective, developers should ensure that all function parameters are validated before use, implementing proper null checks and error handling mechanisms. The vulnerability also highlights the importance of input validation and robust error handling in browser implementations, as outlined in security standards such as the OWASP Top Ten. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of keeping their browser software updated. Network administrators can deploy intrusion detection systems that monitor for suspicious JavaScript patterns and implement browser hardening measures that disable potentially dangerous JavaScript functions when not explicitly required. The incident serves as a reminder of the critical importance of thorough testing and validation of browser JavaScript engines to prevent similar vulnerabilities from being exploited in the future.