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CVE-2021-39216— Wasmtime 资源管理错误漏洞

一分钟漏洞结论

影响对象
bytecodealliance wasmtime
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Wasmtime是一个字节码联盟项目，它是一个独立的仅用于 WebAssembly 和 WASI 的 wasm 优化运行时。 Wasmtime 存在资源管理错误漏洞，该漏洞源于将多个 externref 从主机传递给访客 Wasm content 时，存在释放后使用错误。

CVSS 6.3 · Medium EPSS 0.31% · P21

可能的 ATT&CK 技术 1 AI

T1211 · Exploitation for Stealth
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一、 漏洞 CVE-2021-39216 基础信息

漏洞信息
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Vulnerability Title
Use after free passing `externref`s to Wasm in Wasmtime
来源: CVE Program / CVE List V5
Vulnerability Description
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. However the first `externref` is not rooted until we pass control to Wasm, and therefore could be reclaimed by the collector if nothing else was holding a reference to it or otherwise keeping it alive. Then, when control was passed to Wasm after the garbage collection, Wasm could use the first `externref`, which at this point has already been freed. We have reason to believe that the effective impact of this bug is relatively small because usage of `externref` is currently quite rare. The bug has been fixed, and users should upgrade to Wasmtime 0.30.0. If you cannot upgrade Wasmtime yet, you can avoid the bug by disabling reference types support in Wasmtime by passing `false` to `wasmtime::Config::wasm_reference_types`.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
释放后使用
来源: CVE Program / CVE List V5
Vulnerability Title
Wasmtime 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Wasmtime是一个字节码联盟项目，它是一个独立的仅用于 WebAssembly 和 WASI 的 wasm 优化运行时。 Wasmtime 存在资源管理错误漏洞，该漏洞源于将多个 externref 从主机传递给访客 Wasm content 时，存在释放后使用错误。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
bytecodealliance wasmtime >=0.19.0, <=0.29.0 -

二、漏洞 CVE-2021-39216 的公开POC

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三、漏洞 CVE-2021-39216 的情报信息

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CVE-2021-39216 补丁与修复 (1)

CVE-2021-39216 厂商安全公告 (1)

CVE-2021-39216 邮件列表归档 (2)

CVE-2021-39216 其他参考 (1)

同批安全公告 · bytecodealliance · 2021-09-17 · 共 3 条

CVE-2021-39218 6.3 MEDIUM Wasmtime 缓冲区错误漏洞
CVE-2021-39219 6.3 MEDIUM Wasmtime 代码问题漏洞

IV. Related Vulnerabilities

Same product: wasmtime
Same vendor: bytecodealliance
Same weakness: CWE-416

V. Comments for CVE-2021-39216

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