GHSA-jxhv-7h78-9775
Wasmtime: Panic when transcoding misaligned utf-16 strings
Details
### Impact
Wasmtime's implementation of transcoding strings into the Component Model's `utf16` or `latin1+utf16` encodings improperly verified the alignment of reallocated strings. This meant that unaligned pointers could be passed to the host for transcoding which would trigger a host panic. This panic is possible to trigger from malicious guests which transfer very specific strings across components with specific addresses.
Host panics are considered a DoS vector in Wasmtime as the panic conditions are controlled by the guest in this situation.
### Patches
Wasmtime 24.0.7, 36.0.7, 42.0.2, and 43.0.1 have been issued to fix this bug. Users are recommended to update to these patched versions of Wasmtime.
### Workarounds
There is no workaround for this bug. Hosts are recommended to updated to a patched version of Wasmtime.
Are you affected?
Enter the version of the package you're using.
Affected packages
0Fixed in: 24.0.7Upgrade wasmtime to 24.0.7 or newer (ecosystem crates.io).
25.0.0Fixed in: 36.0.7Upgrade wasmtime to 36.0.7 or newer (ecosystem crates.io).
37.0.0Fixed in: 42.0.2Upgrade wasmtime to 42.0.2 or newer (ecosystem crates.io).
43.0.0Fixed in: 43.0.1Upgrade wasmtime to 43.0.1 or newer (ecosystem crates.io).