Vulnerability · Published Mar 8, 2023 · Assigned by GitHub_M
CVE-2023-27477
Low 3.1
In plain English
A low-severity security flaw in wasmtime from bytecodealliance. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| bytecodealliance | wasmtime | cranelift-codegen: >= 0.88.0, < 0.91.1cranelift-codegen: >= 0.92.0, < 0.92.1cranelift-codegen: >= 0.93.0, < 0.93.1 wasmtime: >= 0.37.0, < 4.0.1 wasmtime: >= 5.0.0, < 5.0.1 wasmtime: >= 6.0.0, < 6.0.1 |
Weakness: CWE-193 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- https://docs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simd
- https://github.com/webassembly/simd
- https://groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw
- https://github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1