CVE-2016-0718 in iTunes
Summary
by MITRE
Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.
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Analysis
by VulDB Data Team • 11/24/2022
The vulnerability identified as CVE-2016-0718 affects the Expat XML parser library, which is widely used across various software applications for processing XML data. This flaw represents a critical security issue that can be exploited by context-dependent attackers to either crash applications or potentially execute arbitrary code on affected systems. The vulnerability stems from insufficient input validation within the parser's handling of malformed XML documents, creating a dangerous condition where carefully crafted input can trigger unexpected behavior in the underlying software.
The technical implementation of this vulnerability involves a buffer overflow condition that occurs when the Expat parser encounters malformed input documents. When processing XML content that contains irregularities or violates expected formatting patterns, the parser fails to properly manage memory allocation and buffer boundaries. This improper handling leads to memory corruption that can manifest as application crashes or more severe exploitation opportunities. The buffer overflow vulnerability specifically relates to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The vulnerability's exploitation potential increases significantly when the parser is used in applications that process untrusted XML data from external sources, making it particularly dangerous in web applications and network services.
The operational impact of CVE-2016-0718 extends beyond simple denial of service conditions to encompass potential remote code execution capabilities. Applications utilizing the vulnerable Expat library may experience complete system compromise when attackers successfully exploit this vulnerability through malicious XML input. The vulnerability affects systems where Expat is integrated as a core component for XML processing, including web servers, application frameworks, and enterprise software solutions. Attackers can leverage this vulnerability to gain unauthorized access to systems, execute malicious code with the privileges of the affected application, and potentially establish persistent access. The attack surface is broad since Expat is used in numerous software implementations across different platforms and operating systems, making the vulnerability particularly concerning for organizations maintaining diverse technology infrastructures.
Mitigation strategies for CVE-2016-0718 should prioritize immediate patching of affected Expat library versions, with administrators monitoring for security updates from software vendors and the Expat project maintainers. Organizations should implement input validation measures that sanitize XML data before processing, employ sandboxing techniques for XML parsing operations, and deploy intrusion detection systems to monitor for exploitation attempts. The vulnerability aligns with ATT&CK technique T1203, which covers exploitation of software vulnerabilities, and T1059, which involves command and scripting interpreter usage. Security teams should also consider implementing network segmentation to limit the potential impact of successful exploitation and establish incident response procedures specifically addressing XML-based attack vectors. Regular security assessments and vulnerability scanning should include checks for Expat library versions to ensure comprehensive protection against this and similar vulnerabilities.