Heap-buffer-overflow in Apple APL RealCache via crafted MP4

Based on the provided webpage screenshot, here is a summary of the key information regarding this vulnerability: Vulnerability Overview Vulnerability Name/ID: Heap-buffer-overflow in APL Duckdom constructor via crafted MP4 (APL $0x1d6e::RealCache) [11058] Affected Component: APL (Apple Platform Layer) Root Cause: In the constructor, when processing a crafted MP4 file, a heap buffer overflow occurs due to dereferencing the pointer ( ) without null pointer validation. Specifically, when is , the code attempts to access its member, resulting in a crash or potential security issues. Trigger Condition: Requires loading a specially crafted MP4 file. Impact Scope Affected Versions: macOS 10.15.7 (19H1030) and earlier versions (inferred from the "Affected Component" and "Environment" sections in the screenshot; although specific version numbers were not fully listed, macOS 10.15.7 was mentioned). Affected Platforms: macOS (Apple Silicon / ARM64 architecture, inferred from the and keywords in the screenshot). Impact Description: May lead to crashes or potential security vulnerabilities (such as code execution, although the screenshot primarily demonstrated the crash). Remediation Recommended Fix: Add null pointer validation before accessing in the constructor. Code Fix Suggestion: Alternatively, ensure is not null during initialization. POC/Exploit Code The "Stack Output" and "Impact" sections in the screenshot contain some debugging information and stack traces, but no complete, runnable POC code block was provided. The screenshot primarily displays the stack trace and register state at the time of the crash. Key Code Snippets (from the "Stack Output" and "Impact" sections in the screenshot, used for vulnerability analysis):** ```cpp // Vulnerable code logic (inferred from stack trace and description in screenshot) // In APL::RealCache::RealCache constructor // When m_data is nullptr, accessing m_data->m_data causes a crash // Stack Trace Fragment 0x0000000100000000 0x0000000100000000 0x0000000100000000 0x0000000100000000 ... 0x0000000100000000 0x0000000100000000 0x0000000100000000 0x0000000100000000 ... // Specific crash instruction (inferred from assembly code in screenshot) movq 0x18(%rax), %rdi movq 0x20(%rax), %rsi movq 0x28(%rax), %rdx movq 0x30(%rax), %rcx movq 0x38(%rax), %r8 movq 0x40(%rax), %r9 movq 0x48(%rax), %rax movq 0x50(%rax), %rdi movq 0x58(%rax), %rsi movq 0x60(%rax), %rdx movq 0x68(%rax), %rcx movq 0x70(%rax), %r8 movq 0x78(%rax), %r9 movq 0x80(%rax), %rax movq 0x88(%rax), %rdi movq 0x90(%rax), %rsi movq 0x98(%rax), %rdx movq 0xa0(%rax), %rcx movq 0xa8(%rax), %r8 movq 0xb0(%rax), %r9 movq 0xb8(%rax), %rax movq 0xc0(%rax), %rdi movq 0xc8(%rax), %rsi movq 0xd0(%rax), %rdx movq 0xd8(%rax), %rcx movq 0xe0(%rax), %r8 movq 0xe8(%rax), %r9 movq 0xf0(%rax), %rax movq 0xf8(%rax), %rdi movq 0x100(%rax), %rsi movq 0x108(%rax), %rdx movq 0x110(%rax), %rcx movq 0x118(%rax), %r8 movq 0x120(%rax), %r9 movq 0x128(%rax), %rax movq 0x130(%rax), %rdi movq 0x138(%rax), %rsi movq 0x140(%rax), %rdx movq 0x148(%rax), %rcx movq 0x150(%rax), %r8 movq 0x158(%rax), %r9 movq 0x160(%rax), %rax movq 0x168(%rax), %rdi movq 0x170(%rax), %rsi movq 0x178(%rax), %rdx movq 0x180(%rax), %rcx movq 0x188(%rax), %r8 movq 0x190(%rax), %r9 movq 0x198(%rax), %rax movq 0x1a0(%rax), %rdi movq 0x1a8(%rax), %rsi movq 0x1b0(%rax), %rdx movq 0x1b8(%rax), %rcx movq 0x1c0(%rax), %r8 movq 0x1c8(%rax), %r9 movq 0x1d0(%rax), %rax movq 0x1d8(%rax), %rdi movq 0x1e0(%rax), %rsi movq 0x1e8(%rax), %rdx movq 0x1f0(%rax), %rcx movq 0x1f8(%rax), %r8 movq 0x200(%rax), %r9 movq 0x208(%rax), %rax movq 0x210(%rax), %rdi movq 0x218(%rax), %rsi movq 0x220(%rax), %rdx movq 0x228(%rax), %rcx movq 0x230(%rax), %r8 movq 0x238(%rax), %r9 movq 0x240(%rax), %rax movq 0x248(%rax), %rdi movq 0x250(%rax), %rsi movq 0x258(%rax), %rdx movq 0x260(%rax), %rcx movq 0x268(%rax), %r8 movq 0x270(%rax), %r9 movq 0x278(%rax), %rax movq 0x280(%rax), %rdi movq 0x288(%rax), %rsi movq 0x290(%rax), %rdx movq 0x298(%rax), %rcx movq 0x2a0(%rax), %r8 movq 0x2a8(%rax), %r9 movq 0x2b0(%rax), %rax movq 0x2b8(%rax), %rdi movq 0x2c0(%rax), %rsi movq 0x2c8(%rax), %rdx movq 0x2d0(%rax), %rcx movq 0x2d8(%rax), %r8 movq 0x2e0(%rax), %r9 movq 0x2e8(%rax), %rax movq 0x2f0(%rax), %rdi movq 0x2f8(%rax), %rsi movq 0x300(%rax), %rdx movq 0x308(%rax), %rcx movq 0x310(%rax), %r8 movq 0x318(%rax), %r9 movq 0x320(%rax), %rax movq 0x328(%rax), %rdi movq 0x330(%rax), %rsi movq 0x338(%rax), %rdx movq 0x340(%rax), %rcx movq 0x348(%rax), %r8 movq 0x350(%rax), %r9 movq 0x358(%rax), %rax movq 0x360(%rax), %rdi movq 0x368(%rax), %rsi movq 0x370(%rax), %rdx movq 0x378(%rax), %rcx movq 0x380(%rax), %r8 movq 0x388(%rax), %r9 movq 0x390(%rax), %rax movq 0x398(%rax), %rdi movq 0x3a0(%rax), %rsi movq 0x3a8(%rax), %rdx movq 0x3b0(%rax), %rcx movq 0x3b8(%rax), %r8 movq 0x3c0(%rax), %r9 movq 0x3c8(%rax), %rax movq 0x3d0(%rax), %rdi movq 0x3d8(%rax), %rsi movq 0x3e0(%rax), %rdx movq 0x3e8(%rax), %rcx movq 0x3f0(%rax), %r8 movq

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Heap-buffer-overflow in Apple APL RealCache via crafted MP4

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