CVE-2012-0635 in iOS
Summary
by MITRE
WebKit, as used in Apple iOS before 5.1 and iTunes before 10.6, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2012-03-07-1 and APPLE-SA-2012-03-07-2.
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2012-0635 represents a critical memory corruption flaw within WebKit engine components that power Apple's iOS operating system and iTunes software. This vulnerability specifically affects versions of Apple iOS prior to 5.1 and iTunes versions before 10.6, creating a significant attack surface for remote threat actors who can exploit the weakness through maliciously crafted websites. The flaw manifests as a memory corruption issue that can be triggered when WebKit processes specially designed web content, potentially allowing attackers to execute arbitrary code on affected systems or cause application crashes that result in denial of service conditions.
The technical nature of this vulnerability stems from improper memory handling within WebKit's rendering engine, which processes web content for display in iOS browsers and iTunes applications. When users visit compromised websites that contain maliciously crafted HTML, JavaScript, or multimedia content, the WebKit engine fails to properly validate memory allocations and deallocations, leading to memory corruption patterns that can be leveraged for exploitation. This type of vulnerability typically falls under CWE-122, which describes "Heap-based Buffer Overflow," or related heap corruption categories that affect memory management in web rendering engines. The flaw operates at the intersection of browser engine security and memory safety, where improper input validation allows attackers to manipulate memory structures in ways that bypass normal security boundaries.
The operational impact of CVE-2012-0635 extends beyond simple application crashes to potentially enable full remote code execution capabilities that could compromise user devices. Attackers exploiting this vulnerability could gain unauthorized access to affected systems, potentially accessing sensitive user data, installing malicious software, or using the compromised devices as launching points for further attacks within corporate networks. The vulnerability's classification as a remote attack vector means that users need only visit a malicious website to be compromised, making it particularly dangerous in phishing campaigns or drive-by download scenarios. This weakness directly aligns with ATT&CK framework technique T1203, which covers "Exploitation for Client Execution" and demonstrates how web-based attacks can be used to establish persistent access to target systems.
Mitigation strategies for this vulnerability require immediate patching of affected systems with the latest security updates released by Apple. Users should upgrade to iOS 5.1 or later versions and iTunes 10.6 or newer to eliminate exposure to this memory corruption vulnerability. Network administrators should implement web filtering solutions to block access to known malicious domains and consider deploying intrusion detection systems that can identify exploitation attempts targeting this specific vulnerability. Organizations should also conduct security assessments to identify any systems still running vulnerable versions of Apple software and ensure proper patch management processes are in place to maintain system security. The vulnerability highlights the importance of keeping browser engines and web rendering components updated, as these components represent common attack targets for sophisticated threat actors seeking to exploit memory safety issues in widely deployed software platforms.