wasmtime 4.0.0/5.0.0/6.0.0 on 64-bit Code Generation i8x16.select off-by-one

Summaryinfo

A vulnerability classified as problematic has been found in wasmtime 4.0.0/5.0.0/6.0.0 on 64-bit. The affected element is the function i8x16.select of the component Code Generation Handler. This manipulation causes off-by-one. This vulnerability appears as CVE-2023-27477. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in wasmtime 4.0.0/5.0.0/6.0.0 on 64-bit. It has been declared as problematic. Affected by this vulnerability is the function i8x16.select of the component Code Generation Handler. The manipulation with an unknown input leads to a off-by-one vulnerability. The CWE definition for the vulnerability is CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented 03/09/2023 as GHSA-xm67-587q-r2vw. The advisory is shared at github.com. This vulnerability is known as CVE-2023-27477 since 03/01/2023. Technical details are known, but no exploit is available.

Upgrading to version 4.0.1, 5.0.1 or 6.0.1 eliminates this vulnerability. Applying the patch 5dc2bbccbb363e474d2c9a1b8e38a89a43bbd5d1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• wasmtime

Version

• 4.0.0
• 5.0.0
• 6.0.0

License

• open-source

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