CVE-2023-27477

2023-03-0800:00:00

CWE-193

GitHub_M

www.cve.org

wasmtime

cranelift

bug

webassembly

x86_64

pshufb

3.1 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

5 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

52.8%

JSON

wasmtime is a fast and secure runtime for WebAssembly. Wasmtime’s code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly i8x16.select instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the pshufb instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.

CNA Affected

[
  {
    "vendor": "bytecodealliance",
    "product": "wasmtime",
    "versions": [
      {
        "version": "cranelift-codegen: >= 0.88.0, < 0.91.1",
        "status": "affected"
      },
      {
        "version": "cranelift-codegen: >= 0.92.0, < 0.92.1",
        "status": "affected"
      },
      {
        "version": "cranelift-codegen: >= 0.93.0, < 0.93.1",
        "status": "affected"
      },
      {
        "version": " wasmtime: >= 0.37.0, < 4.0.1",
        "status": "affected"
      },
      {
        "version": " wasmtime: >= 5.0.0, < 5.0.1",
        "status": "affected"
      },
      {
        "version": " wasmtime: >= 6.0.0, < 6.0.1",
        "status": "affected"
      }
    ]
  }
]