CVE-2019-8750 in iCloud
Summary
by MITRE
Multiple memory corruption issues were addressed with improved input validation. This issue is fixed in watchOS 6.1, iCloud for Windows 11.0. Multiple issues in libxslt.
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Analysis
by VulDB Data Team • 01/31/2024
The vulnerability identified as CVE-2019-8750 represents a series of memory corruption issues within the libxslt library that serves as a crucial component in XML processing for various Apple platforms and applications. This flaw specifically affects the watchOS 6.1 and iCloud for Windows 11.0 releases, indicating the vulnerability's impact spans across Apple's ecosystem of devices and services. The libxslt library, which provides XSLT (Extensible Stylesheet Language Transformations) processing capabilities, forms a fundamental part of XML data manipulation and transformation workflows in numerous applications and operating systems.
The technical nature of this vulnerability stems from inadequate input validation mechanisms within the libxslt processing engine. When the library processes malformed or specially crafted XML input containing XSLT transformations, it fails to properly validate the data structures and memory allocations, leading to potential buffer overflows, heap corruption, or other memory management errors. These memory corruption issues can manifest in unpredictable ways, potentially allowing attackers to execute arbitrary code or cause application crashes. The vulnerability's classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow conditions, both of which are common manifestations of improper input validation in processing libraries.
The operational impact of CVE-2019-8750 extends beyond simple application instability, as it represents a potential pathway for privilege escalation and remote code execution attacks. When exploited, these memory corruption vulnerabilities could enable malicious actors to gain unauthorized access to affected systems, particularly in scenarios where applications process untrusted XML data from external sources. The vulnerability affects multiple platforms including Apple Watch, iOS devices, and Windows systems through iCloud integration, creating a broad attack surface that requires coordinated remediation across different operating environments. This cross-platform impact suggests the vulnerability may be leveraged in targeted attacks against users of Apple's ecosystem who rely on iCloud services for data synchronization and backup.
The fix implemented in watchOS 6.1 and iCloud for Windows 11.0 addresses the root cause by introducing enhanced input validation procedures within the libxslt library. These improvements include stricter bounds checking, proper memory allocation handling, and more robust parsing mechanisms that prevent malformed input from causing memory corruption. Organizations should prioritize updating affected systems to these patched versions to mitigate the risk of exploitation. The remediation process should also include comprehensive testing of applications that rely on libxslt for XML processing to ensure compatibility with the updated validation mechanisms. Security teams should monitor for potential exploitation attempts and consider implementing network-based detection measures to identify attempts to leverage this vulnerability in targeted attacks. Additionally, the vulnerability demonstrates the importance of maintaining up-to-date security patches across all components of complex software ecosystems, particularly those handling sensitive data processing functions like XML transformation and data manipulation.