Wasmtime up to 0.38.1 Cranelift incorrect calculation

Summaryinfo

A vulnerability has been found in Wasmtime up to 0.38.1 and classified as critical. This impacts an unknown function of the component Cranelift. The manipulation of the argument incorrect leads to calculation. This vulnerability is documented as CVE-2022-31169. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Wasmtime up to 0.38.1. This issue affects an unknown part of the component Cranelift. The manipulation of the argument incorrect with an unknown input leads to a calculation vulnerability. Using CWE to declare the problem leads to CWE-682. The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Wasmtime is a standalone runtime for WebAssembly. There is a bug in Wasmtime's code generator, Cranelift, for AArch64 targets where constant divisors can result in incorrect division results at runtime. This affects Wasmtime prior to version 0.38.2 and Cranelift prior to 0.85.2. This issue only affects the AArch64 platform. Other platforms are not affected. The translation rules for constants did not take into account whether sign or zero-extension should happen which resulted in an incorrect value being placed into a register when a division was encountered. The impact of this bug is that programs executing within the WebAssembly sandbox would not behave according to the WebAssembly specification. This means that it is hypothetically possible for execution within the sandbox to go awry and WebAssembly programs could produce unexpected results. This should not impact hosts executing WebAssembly but does affect the correctness of guest programs. This bug has been patched in Wasmtime version 0.38.2 and cranelift-codegen 0.85.2. There are no known workarounds.

The weakness was released 07/22/2022 as GHSA-7f6x-jwh5-m9r4. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2022-31169 since 05/18/2022. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.38.2 eliminates this vulnerability. Applying the patch 2ba4bce5cc719e5a74e571a534424614e62ecc41 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

• 0.38.0
• 0.38.1

License

• open-source

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CPE 2.2info

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