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CVE-2021-32845— Moby HyperKit uninitialized memory use vtrnd pci_vtrnd_notify

Quick assessment

Affected
moby hyperkit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HyperKit是Moby开源的一个用于在应用程序中嵌入虚拟机监控程序功能的工具包。 HyperKit 0.20210107及之前版本存在安全漏洞，该漏洞源于 中的 无法检查 的返回值，这导致 struct iovec iov未初始化并用于读取 中的内存，攻击者利用该漏洞可以使主机崩溃，导致拒绝服务。

CVSS 7.7 · High EPSS 0.25% · P15
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I. Basic Information for CVE-2021-32845

Vulnerability Information
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Vulnerability Title
Moby HyperKit uninitialized memory use vtrnd pci_vtrnd_notify
Source: CVE Program / CVE List V5
Vulnerability Description
HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of `qnotify` at `pci_vtrnd_notify` fails to check the return value of `vq_getchain`. This leads to `struct iovec iov;` being uninitialized and used to read memory in `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` when an attacker is able to make `vq_getchain` fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
HyperKit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HyperKit是Moby开源的一个用于在应用程序中嵌入虚拟机监控程序功能的工具包。 HyperKit 0.20210107及之前版本存在安全漏洞，该漏洞源于`pci_vtrnd_notify` 中的 `qnotify` 无法检查 `vq_getchain` 的返回值，这导致 struct iovec iov未初始化并用于读取 `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` 中的内存，攻击者利用该漏洞可以使主机崩溃，导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
moby hyperkit 0.20210107 ~ 0.20210107 -

II. Public POCs for CVE-2021-32845

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III. Intelligence Information for CVE-2021-32845

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Patches & Fixes for CVE-2021-32845 (2)

Other References for CVE-2021-32845 (1)

Same Patch Batch · moby · 2023-02-17 · 4 CVEs total

CVE-2021-32846 7.7 HIGH Moby HyperKit uninitialized memory use in virtio-sock pci_vtsock_proc_tx
CVE-2021-32843 6.2 MEDIUM HyperKit 代码问题漏洞
CVE-2021-32844 6.2 MEDIUM HyperKit 代码问题漏洞

IV. Related Vulnerabilities

Same product: hyperkit
Same vendor: moby
Same weakness: CWE-908

V. Comments for CVE-2021-32845

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