Vulnerability in Bytecodealliance Cranelift-Codegen
CVE-2023-27477
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (48.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Bytecodealliance Cranelift-Codegen — versions 0.92.0, 0.93.0
- Bytecodealliance Wasmtime — versions 6.0.0, cranelift-codegen: >= 0.92.0, < 0.92.1, wasmtime: >= 5.0.0, < 5.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- docs.rs/wasmtime/latest/wasmtime/struct.Config.html (Product)
- github.com/webassembly/simd (Not Applicable)
- groups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ (Mailing List, Release Notes, Vendor Advisory)
- github.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vw (Patch, Mitigation, Vendor Advisory)
- github.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43b… (Patch)
Frequently asked questions
- What is CVE-2023-27477?
- CVE-2023-27477 is a low-severity vulnerability in Bytecodealliance Cranelift-Codegen, classified under Off-by-one Error. CVSS score: 3.1/10. Published 2023-03-08.
- How severe is CVE-2023-27477?
- Low severity. CVSS v3 base score is 3.1 out of 10.
- Is CVE-2023-27477 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.