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CVE-2021-20263

Quick assessment

Affected
n/a QEMU
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.

QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。 QEMU 存在安全漏洞，攻击者可利用该漏洞可以通过QEMU的Virtiofsd Xattrmap选项绕过限制，从而提高在主机系统上的特权。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.38% · P31
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I. Basic Information for CVE-2021-20263

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
QEMU 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QEMU（Quick Emulator）是法国法布里斯-贝拉（Fabrice Bellard）个人开发者的一套模拟处理器软件。该软件具有速度快、跨平台等特点。 QEMU 存在安全漏洞，攻击者可利用该漏洞可以通过QEMU的Virtiofsd Xattrmap选项绕过限制，从而提高在主机系统上的特权。
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
- QEMU qemu 5.2.50 -

II. Public POCs for CVE-2021-20263

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III. Intelligence Information for CVE-2021-20263

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Vendor Advisories for CVE-2021-20263 (3)

Mailing List Discussions for CVE-2021-20263 (1)

Same Patch Batch · n/a · 2021-03-09 · 29 CVEs total

CVE-2021-23352 8.6 HIGH Command Injection
CVE-2021-23353 5.9 MEDIUM Regular Expression Denial of Service (ReDoS)
CVE-2021-28116 3.7 LOW Squid 缓冲区错误漏洞
CVE-2021-20246 ImageMagick Studio ImageMagick 数字错误漏洞
CVE-2021-28119 Xander Frangos twinkle-tray 安全漏洞
CVE-2021-20245 ImageMagick Studio ImageMagick 数字错误漏洞
CVE-2021-20244 ImageMagick Studio ImageMagick 数字错误漏洞
CVE-2021-20243 ImageMagick Studio ImageMagick 数字错误漏洞
CVE-2021-20241 ImageMagick Studio ImageMagick 数字错误漏洞
CVE-2021-28006 Sourcecodester Web Based Quiz System 跨站脚本漏洞
CVE-2021-20272 Privoxy 安全漏洞
CVE-2021-20273 Privoxy 输入验证错误漏洞
CVE-2021-20274 Privoxy 代码问题漏洞
CVE-2021-20275 Privoxy 缓冲区错误漏洞
CVE-2021-20276 Privoxy 缓冲区错误漏洞
CVE-2021-25915 Eugene Ware changeset 安全漏洞
CVE-2021-20253 Red Hat ansible-tower 安全漏洞
CVE-2021-20268 Linux kernel 输入验证错误漏洞
CVE-2021-20262 Red Hat Keycloak 访问控制错误漏洞
CVE-2020-28150 I-Net Software Clear Reports 输入验证错误漏洞

Showing top 20 of 29 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: QEMU
Same vendor: n/a
Same weakness: CWE-281

V. Comments for CVE-2021-20263

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