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CVE-2023-27477

3.1 · LOW

wasmtime is a fast and secure runtime for WebAssembly.

Published Mar 8, 2023CWE-193EPSS 0.62%

Overview

CVE-2023-27477 is a low-severity vulnerability. It was published on March 8, 2023 and has a CVSS 3.1 base score of 3.1 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simdGitHubgithub.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1GitHubgithub.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vwGitHubgithub.com/webassembly/simdRefgroups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQRefdocs.rs/wasmtime/latest/wasmtime/struct.Config.html#method.wasm_simdGitHubgithub.com/bytecodealliance/wasmtime/commit/5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1GitHubgithub.com/bytecodealliance/wasmtime/security/advisories/GHSA-xm67-587q-r2vwGitHubgithub.com/webassembly/simdRefgroups.google.com/a/bytecodealliance.org/g/sec-announce/c/Mov-ItrNJsQ

How CyberStrike helps

Frequently asked questions

What is CVE-2023-27477?

CVE-2023-27477 is a low-severity vulnerability. It was published on March 8, 2023 and has a CVSS 3.1 base score of 3.1 (LOW).

How severe is CVE-2023-27477?

This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-27477?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-27477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-27477 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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