CVE-2022-39393: Improper Removal of Sensitive Information Before Storage or Transfer

November 10, 2022 (updated November 17, 2022)

Wasmtime is a standalone runtime for WebAssembly. Prior to version 2.0.2, there is a bug in Wasmtime’s implementation of its pooling instance allocator where when a linear memory is reused for another instance the initial heap snapshot of the prior instance can be visible, erroneously to the next instance. This bug has been patched and users should upgrade to Wasmtime 2.0.2. Other mitigations include disabling the pooling allocator and disabling the memory-init-cow.

References

github.com/bytecodealliance/wasmtime/commit/2614f2e9d2d36805ead8a8da0fa0c6e0d9e428a0
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wh6w-3828-g9qf
nvd.nist.gov/vuln/detail/CVE-2022-39393

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