CVE-2022-31169 Cranelift vulnerable to miscompilation of constant values in division on AArch64

2022-07-2113:50:11

CWE-682

GitHub_M

www.cve.org

cranelift

wasmtime

aarch64

constant division

miscompilation

webassembly

sandbox

bug

patch

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

0.001

Percentile

29.0%

JSON

Wasmtime is a standalone runtime for WebAssembly. There is a bug in Wasmtime’s code generator, Cranelift, for AArch64 targets where constant divisors can result in incorrect division results at runtime. This affects Wasmtime prior to version 0.38.2 and Cranelift prior to 0.85.2. This issue only affects the AArch64 platform. Other platforms are not affected. The translation rules for constants did not take into account whether sign or zero-extension should happen which resulted in an incorrect value being placed into a register when a division was encountered. The impact of this bug is that programs executing within the WebAssembly sandbox would not behave according to the WebAssembly specification. This means that it is hypothetically possible for execution within the sandbox to go awry and WebAssembly programs could produce unexpected results. This should not impact hosts executing WebAssembly but does affect the correctness of guest programs. This bug has been patched in Wasmtime version 0.38.2 and cranelift-codegen 0.85.2. There are no known workarounds.

CNA Affected

[
  {
    "product": "wasmtime",
    "vendor": "bytecodealliance",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.38.2"
      },
      {
        "status": "affected",
        "version": "< 0.85.2"
      }
    ]
  }
]