bytecodealliance wasmtime 使用未经初始化的指针

CVE编号

CVE-2022-23636

利用情况

暂无

补丁情况

N/A

披露时间

2022-02-17

漏洞描述

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. The bug has been fixed in 0.34.1 and 0.33.1 and users are encouraged to upgrade as soon as possible. If it is not possible to upgrade to version 0.34.1 or 0.33.1 of the `wasmtime` crate, it is recommend that support for the reference types proposal be disabled by passing `false` to `Config::wasm_reference_types`. Doing so will prevent modules that use `externref` from being loaded entirely.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://github.com/bytecodealliance/wasmtime/commit/886ecc562040bef61faf19438...
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-88xq-w8cq-xfg7

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	bytecodealliance	wasmtime	*		Up to (excluding) 0.33.1
	运行在以下环境
	应用	bytecodealliance	wasmtime	0.34.0	-

CVSS3评分 8.1

• 攻击路径 网络
• 攻击复杂度 高
• 权限要求 无
• 影响范围 未更改
• 用户交互 无
• 可用性 高
• 保密性 高
• 完整性 高

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CWE-ID 漏洞类型 CWE-824 使用未经初始化的指针