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CVE-2021-34999— OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability

Quick assessment

Affected
OpenBSD Kernel
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.

OpenBSD是加拿大OpenBSD（Openbsd）项目组的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD Kernel存在安全漏洞，该漏洞源于组播路由的实现中，在访问内存之前没有对内存进行适当的初始化 。该漏洞允许本地攻击者可利用该漏洞泄露OpenBSD内核受影响安装的敏感信息。攻击者可以利用这个漏洞和其他漏洞来升级特权，并在内核上下文中执行任意代码。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.24% · P14
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I. Basic Information for CVE-2021-34999

Vulnerability Information
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Vulnerability Title
OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability. This vulnerability allows local attackers to disclose sensitive information on affected installations of OpenBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the implementation of multicast routing. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel. . Was ZDI-CAN-14540.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
OpenBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenBSD是加拿大OpenBSD（Openbsd）项目组的一套跨平台的、基于BSD的类UNIX操作系统。 OpenBSD Kernel存在安全漏洞，该漏洞源于组播路由的实现中，在访问内存之前没有对内存进行适当的初始化 。该漏洞允许本地攻击者可利用该漏洞泄露OpenBSD内核受影响安装的敏感信息。攻击者可以利用这个漏洞和其他漏洞来升级特权，并在内核上下文中执行任意代码。
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
OpenBSD Kernel OpenBSD 6.9 -

II. Public POCs for CVE-2021-34999

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III. Intelligence Information for CVE-2021-34999

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Vendor Advisories for CVE-2021-34999 (1)

IV. Related Vulnerabilities

Same product: Kernel
Same vendor: OpenBSD
Same weakness: CWE-908

V. Comments for CVE-2021-34999

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