Process crash via untracked Const64 stack slot
Published Aug 12, 2021 · Updated Aug 4, 2024
Heap buffer overflow in Wasm3 0.5.0 allows attackers to crash an embedding process by loading a crafted WebAssembly module. During module initialization, EvaluateExpression compiles a Const64 instruction, but TouchSlot fails to update maxStackSlots outside a function, so op_Const64 writes eight bytes beyond the allocated stack. The host must load attacker-supplied WebAssembly; the demonstrated consequence is heap corruption and a process crash, not confirmed code execution.
Summary
What happened
Heap buffer overflow in Wasm3 0.5.0 allows attackers to crash an embedding process by loading a crafted WebAssembly module. During module initialization, EvaluateExpression compiles a Const64 instruction, but TouchSlot fails to update maxStackSlots outside a function, so op_Const64 writes eight bytes beyond the allocated stack. The host must load attacker-supplied WebAssembly; the demonstrated consequence is heap corruption and a process crash, not confirmed code execution.
The record
- CVE
- CVE-2021-38592
- Published
- Aug 12, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 12, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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