Wasmtime up to 2022-05-20 Cranelift use after free

Summaryinfo

A vulnerability described as critical has been identified in Wasmtime 0.36.0/0.37.0/0.38.0/0.38.2/2022-05-20. Affected by this issue is some unknown functionality of the component Cranelift. The manipulation results in use after free. This vulnerability was named CVE-2022-31146. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Wasmtime 0.36.0/0.37.0/0.38.0/0.38.2/2022-05-20. Affected is an unknown code block of the component Cranelift. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

There is a bug in the Wasmtime's code generator, Cranelift, where functions using reference types may be incorrectly missing metadata required for runtime garbage collection. This means that if a GC happens at runtime then the GC pass will mistakenly think these functions do not have live references to GC'd values, reclaiming them and deallocating them. The function will then subsequently continue to use the values assuming they had not been GC'd, leading later to a use-after-free. This bug was introduced in the migration to the `regalloc2` register allocator that occurred in the Wasmtime 0.37.0 release on 2022-05-20. This bug has been patched and users should upgrade to Wasmtime version 0.38.2. Mitigations for this issue can be achieved by doing one of: * Disabling the reference types proposal by passing `false` to [`wasmtime::Config::wasm_reference_types`](https://docs.rs/wasmtime/0.38.0/wasmtime/struct.Config.html#method.wasm_reference_types). * Downgrading to Wasmtime 0.36.0 or prior.

The weakness was presented 07/21/2022 as GHSA-5fhj-g3p3-pq9g. The advisory is available at github.com. This vulnerability is traded as CVE-2022-31146 since 05/18/2022. The technical details are unknown and an exploit is not available.

Upgrading eliminates this vulnerability.

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Productinfo

Name

• Wasmtime

Version

• 0.36.0
• 0.37.0
• 0.38.0
• 0.38.2
• 2022-05-20

CPE 2.3info

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CPE 2.2info

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