CVSS: 8.1EPSS: 0%CPEs: 2EXPL: 0CVE-2022-23636 – Invalid drop of partially-initialized instances in wasmtime
https://notcve.org/view.php?id=CVE-2022-23636
Wasmtime is an open source runtime for WebAssembly & WASI. Prior to versions 0.34.1 and 0.33.1, there exists a bug in the pooling instance allocator in Wasmtime's runtime where a failure to instantiate an instance for a module that defines an `externref` global will result in an invalid drop of a `VMExternRef` via an uninitialized pointer. A number of conditions listed in the GitHub Security Advisory must be true in order for an instance to be vulnerable to this issue. Maintainers believe that the effective impact of this bug is relatively small because the usage of `externref` is still uncommon and without a resource limiter configured on the `Store`, which is not the default configuration, it is only possible to trigger the bug from an error returned by `mprotect` or `VirtualAlloc`. Note that on Linux with the `uffd` feature enabled, it is only possible to trigger the bug from a resource limiter as the call to `mprotect` is skipped. • https://github.com/bytecodealliance/wasmtime/commit/886ecc562040bef61faf19438c22285c2d62403a https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-88xq-w8cq-xfg7 • CWE-824: Access of Uninitialized Pointer •
CVSS: 6.3EPSS: 0%CPEs: 3EXPL: 0CVE-2021-39218 – Out-of-bounds read/write and invalid free with `externref`s and GC safepoints in Wasmtime
https://notcve.org/view.php?id=CVE-2021-39218
Wasmtime is an open source runtime for WebAssembly & WASI. In Wasmtime from version 0.26.0 and before version 0.30.0 is affected by a memory unsoundness vulnerability. There was an invalid free and out-of-bounds read and write bug when running Wasm that uses `externref`s in Wasmtime. To trigger this bug, Wasmtime needs to be running Wasm that uses `externref`s, the host creates non-null `externrefs`, Wasmtime performs a garbage collection (GC), and there has to be a Wasm frame on the stack that is at a GC safepoint where there are no live references at this safepoint, and there is a safepoint with live references earlier in this frame's function. Under this scenario, Wasmtime would incorrectly use the GC stack map for the safepoint from earlier in the function instead of the empty safepoint. • https://crates.io/crates/wasmtime https://github.com/bytecodealliance/wasmtime/commit/398a73f0dd862dbe703212ebae8e34036a18c11c https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4873-36h9-wv49 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY • CWE-125: Out-of-bounds Read CWE-590: Free of Memory not on the Heap CWE-787: Out-of-bounds Write •
CVSS: 6.3EPSS: 0%CPEs: 3EXPL: 0CVE-2021-39219 – Wrong type for `Linker`-define functions when used across two `Engine`s
https://notcve.org/view.php?id=CVE-2021-39219
Wasmtime is an open source runtime for WebAssembly & WASI. Wasmtime before version 0.30.0 is affected by a type confusion vulnerability. As a Rust library the `wasmtime` crate clearly marks which functions are safe and which are `unsafe`, guaranteeing that if consumers never use `unsafe` then it should not be possible to have memory unsafety issues in their embeddings of Wasmtime. An issue was discovered in the safe API of `Linker::func_*` APIs. These APIs were previously not sound when one `Engine` was used to create the `Linker` and then a different `Engine` was used to create a `Store` and then the `Linker` was used to instantiate a module into that `Store`. • https://crates.io/crates/wasmtime https://github.com/bytecodealliance/wasmtime/commit/b39f087414f27ae40c44449ed5d1154e03449bff https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q879-9g95-56mx https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY • CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') •
CVSS: 6.3EPSS: 0%CPEs: 3EXPL: 0CVE-2021-39216 – Use after free passing `externref`s to Wasm in Wasmtime
https://notcve.org/view.php?id=CVE-2021-39216
Wasmtime is an open source runtime for WebAssembly & WASI. In Wasmtime from version 0.19.0 and before version 0.30.0 there was a use-after-free bug when passing `externref`s from the host to guest Wasm content. To trigger the bug, you have to explicitly pass multiple `externref`s from the host to a Wasm instance at the same time, either by passing multiple `externref`s as arguments from host code to a Wasm function, or returning multiple `externref`s to Wasm from a multi-value return function defined in the host. If you do not have host code that matches one of these shapes, then you are not impacted. If Wasmtime's `VMExternRefActivationsTable` became filled to capacity after passing the first `externref` in, then passing in the second `externref` could trigger a garbage collection. • https://crates.io/crates/wasmtime https://github.com/bytecodealliance/wasmtime/commit/101998733b74624cbd348a2366d05760b40181f3 https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-v4cp-h94r-m7xf https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAVBRYDDUIY2ZR3K3FO4BVYJKIMJ5TP7 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2Z33FTXFQ6EOINVEQIP4DFBG53G5XIY • CWE-416: Use After Free •