PT-2022-20562 · Wasmtime · Wasmtime

Alexcrichton · Published 2022-07-12 · Updated 2022-07-27 · CVE-2022-31146

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Wasmtime versions 0.37.0 through 0.38.1

Description There is a bug in 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, 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.

Recommendations To resolve the issue, upgrade to Wasmtime version 0.38.2. As a temporary workaround, consider disabling the reference types proposal by passing false to wasmtime::Config::wasm reference types. Alternatively, downgrade to Wasmtime 0.36.0 or prior.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2022-31146

GHSA-5FHJ-G3P3-PQ9G

RUSTSEC-2022-0100

Affected Products

Wasmtime

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/31xxx/CVE-2022-31146.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2022-31146 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-31146 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-31146 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-5fhj-g3p3-pq9g · Vendor Advisory
• https://osv.dev/vulnerability/RUSTSEC-2022-0100 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-31146 · Security Note
• https://osv.dev/vulnerability/CVE-2022-31146 · Vendor Advisory
• https://github.com/bytecodealliance/wasmtime · Note
• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5fhj-g3p3-pq9g · Note
• https://github.com/bytecodealliance/wasmtime/commit/2154c63de94e0372bca5a596c3eaf90147c922d1 · Note
• https://github.com/bytecodealliance/wasmtime/commit/2ba4bce5cc719e5a74e571a534424614e62ecc41 · Note
• https://github.com/WebAssembly/reference-types · Note
• https://rustsec.org/advisories/RUSTSEC-2022-0100.html · Note
• https://crates.io/crates/wasmtime · Note