SB20241009104 - Multiple vulnerabilities in Wasmtime

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2024-47813)

The vulnerability allows a local privileged user to violate WebAssembly control-flow integrity and type safety, or cause a denial of service.

The vulnerability exists due to a time-of-check time-of-use race condition in Wasmtime's internal type registry when creating and dropping multiple type instances concurrently across multiple threads associated with the same wasmtime::Engine. A local privileged user can trigger concurrent type registration and unregistration operations to violate WebAssembly control-flow integrity and type safety, or cause a denial of service.

Wasm guests cannot trigger this bug. User interaction is required.

2) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2024-47763)

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of stack frames in stack-walking code when processing a WebAssembly module that combines tail calls with stack trace capture. A local user can execute a crafted WebAssembly module or component to cause a denial of service.

The issue is triggered when an exported function performs a return_call, return_call_indirect, or return_call_ref to an imported host function that captures a stack trace, such as by raising a trap.

Remediation

Install update from vendor's website.

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7qmx-3fpx-r45m
• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q8hx-mm92-4wvg
• https://github.com/advisories/GHSA-q8hx-mm92-4wvg