The memory may belong to other WebAssembly instances when using the pooling allocator, for example. A guest module can, without the knowledge of the embedder, read/write memory in this region. This means that the virtual memory 6G away from the base of linear memory up to ~34G away can be read/written by a malicious module. Due to this bug, however, addresses up to `0xffffffff * 8 + 0x7ffffffc = 36507222004 = ~34G` bytes away from the base of linear memory are possible from guest code. This bug means that, with default codegen settings, a wasm-controlled load/store operation could read/write addresses up to 35 bits away from the base of linear memory. In affected versions wasmtime's code generator, Cranelift, has a bug on x86_64 targets where address-mode computation mistakenly would calculate a 35-bit effective address instead of WebAssembly's defined 33-bit effective address. Wasmtime is a fast and secure runtime for WebAssembly. In case one is not able to upgrade the Home Assistant Supervisor or the Home Assistant Core application at this time, it is advised to not expose your Home Assistant instance to the internet. Upgrading to at least that version is thus advised. Home Assistant Core 2023.3.0 included mitigation for this vulnerability. This rollout has been completed at the time of publication of this advisory.
The issue has been mitigated and closed in Supervisor version 2023.03.1, which has been rolled out to all affected installations via the auto-update feature of the Supervisor. Installation types, like Home Assistant Container (for example Docker), or Home Assistant Core manually in a Python environment, are not affected. This impacts all Home Assistant installation types that use the Supervisor 2023.01.1 or older.
A remotely exploitable vulnerability bypassing authentication for accessing the Supervisor API through Home Assistant has been discovered. Homeassistant is an open source home automation tool. When executing a program via the bubblewrap sandbox, the nonpriv session can escape to the parent session by using the TIOCSTI ioctl to push characters into the terminal's input buffer, allowing an attacker to escape the sandbox.
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