CVE-2022-32843 in macOS
Summary
by MITRE • 09/23/2022
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Security Update 2022-005 Catalina, macOS Big Sur 11.6.8, macOS Monterey 12.5. Processing a maliciously crafted Postscript file may result in unexpected app termination or disclosure of process memory.
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Analysis
by VulDB Data Team • 05/28/2025
The vulnerability identified as CVE-2022-32843 represents a critical out-of-bounds write flaw within Apple's operating system processing pipeline for Postscript files. This issue stems from insufficient bounds checking mechanisms that fail to properly validate memory access boundaries when handling maliciously crafted Postscript content. The flaw exists in the system's rasterization and rendering components responsible for processing Postscript documents, where improper memory management allows attackers to manipulate data structures beyond their allocated boundaries. Such vulnerabilities typically arise from inadequate input validation and memory safety mechanisms that should prevent unauthorized memory access patterns. The security update 2022-005 Catalina, macOS Big Sur 11.6.8, and macOS Monterey 12.5 address this issue through enhanced bounds checking protocols that validate memory access before allowing data to be written beyond allocated buffer limits. This vulnerability falls under the CWE-787 Out-of-bounds Write category, which specifically addresses memory safety issues where programs write data past the end of allocated buffers. The impact of this vulnerability extends beyond simple application crashes, as it potentially enables attackers to achieve process memory disclosure, a technique commonly associated with information leakage attacks within the ATT&CK framework under the T1005 Data from Local System technique. When exploited, the vulnerability can cause unexpected application termination through segmentation faults or more sophisticated memory corruption that may lead to privilege escalation. The exploitation mechanism relies on crafting malicious Postscript files that trigger the buffer overflow condition during rendering operations, making this particularly dangerous in environments where users may encounter untrusted document content. This issue is particularly concerning in enterprise environments where Postscript files might be encountered through various document processing workflows, printer drivers, or legacy system integrations. The fix implemented by Apple involves strengthening the input validation routines to ensure that all memory access operations are properly bounded and that any attempt to write beyond allocated memory regions is rejected before execution. This approach aligns with the principle of least privilege and defensive programming practices recommended by industry standards. Organizations should prioritize deployment of the security updates as they address a fundamental memory safety issue that could potentially be leveraged for more sophisticated attacks. The vulnerability demonstrates the ongoing challenge of maintaining memory safety in complex operating system components where legacy code integration and performance optimization may inadvertently introduce security weaknesses. Proper testing and validation of memory operations, particularly in document processing and rendering subsystems, becomes crucial for preventing similar vulnerabilities from emerging in future releases. The remediation process requires careful monitoring to ensure that the updated bounds checking mechanisms do not introduce performance regressions while maintaining the necessary security protections. Security teams should consider implementing additional monitoring for suspicious Postscript file processing activities as a defensive measure against potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of regular security updates and the need for continuous assessment of memory safety mechanisms in operating system components.