CVE-2005-1385 in Safari
Summary
by MITRE
Safari 1.3 allows remote attackers to cause a denial of service (application crash) via a long https URL that triggers a NULL pointer dereference.
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Analysis
by VulDB Data Team • 07/08/2018
The vulnerability identified as CVE-2005-1385 represents a classic denial of service flaw in Apple Safari version 1.3 that exploits a NULL pointer dereference condition. This vulnerability specifically manifests when the browser encounters an excessively long https URL, causing the application to crash and become unavailable to users. The flaw stems from inadequate input validation within the URL parsing mechanism, where the browser fails to properly handle malformed or excessively long URL structures before attempting to process them. Such vulnerabilities fall under the broader category of software defects that can be exploited to disrupt service availability, impacting user experience and system reliability.
The technical execution of this vulnerability involves the manipulation of URL length parameters to trigger a NULL pointer dereference within Safari's memory management system. When processing an extremely long https URL, the browser's parsing routine fails to validate the input length properly, leading to a scenario where a null pointer is dereferenced during URL handling operations. This type of error typically occurs when the application attempts to access memory through an uninitialized or improperly validated pointer reference. The vulnerability demonstrates weaknesses in input sanitization and memory safety practices that were prevalent in web browser implementations during the early 2000s era. From a cybersecurity perspective, this flaw represents a primitive but effective method for attackers to disrupt service availability through application-level crashes.
The operational impact of CVE-2005-1385 extends beyond simple application instability to potentially enable more sophisticated attack vectors when combined with other vulnerabilities. While the immediate effect is a denial of service condition that forces users to restart the browser application, the underlying memory management issue could potentially be exploited to execute arbitrary code under certain circumstances. This vulnerability aligns with CWE-476 which specifically addresses NULL pointer dereference conditions in software implementations. The flaw also demonstrates characteristics consistent with ATT&CK technique T1499.004, which involves network denial of service attacks through application-level disruptions. Organizations using affected Safari versions would experience service interruptions that could impact productivity and potentially provide attackers with opportunities to conduct further reconnaissance or exploit additional system weaknesses.
Mitigation strategies for this vulnerability should focus on immediate software updates and input validation enhancements. The most effective approach involves upgrading to a patched version of Safari that properly validates URL lengths and implements robust error handling for malformed inputs. System administrators should implement network-level controls to monitor and filter suspicious URL patterns that might indicate attempts to exploit this vulnerability. Additionally, browser security configurations should be hardened to prevent automatic processing of potentially malicious URLs. From a defensive standpoint, implementing proper input validation and bounds checking mechanisms would prevent similar issues from occurring in future software implementations. The vulnerability serves as a historical example of how seemingly simple input handling flaws can create significant security concerns, emphasizing the importance of comprehensive security testing and validation procedures in software development lifecycle processes.