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CVE-2021-28699

Quick assessment

Affected
Xen xen
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.

Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 存在安全漏洞，攻击者可利用该漏洞在访客系统内绕过 Xen 的 Grant-v2 状态框架的限制，从而提升其在主机系统的特权。

AI Predicted 8.6 Difficulty: Hard EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-28699

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
inadequate grant-v2 status frames array bounds check The v2 grant table interface separates grant attributes from grant status. That is, when operating in this mode, a guest has two tables. As a result, guests also need to be able to retrieve the addresses that the new status tracking table can be accessed through. For 32-bit guests on x86, translation of requests has to occur because the interface structure layouts commonly differ between 32- and 64-bit. The translation of the request to obtain the frame numbers of the grant status table involves translating the resulting array of frame numbers. Since the space used to carry out the translation is limited, the translation layer tells the core function the capacity of the array within translation space. Unfortunately the core function then only enforces array bounds to be below 8 times the specified value, and would write past the available space if enough frame numbers needed storing.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 Xen 存在安全漏洞，攻击者可利用该漏洞在访客系统内绕过 Xen 的 Grant-v2 状态框架的限制，从而提升其在主机系统的特权。
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
Xen xen unspecified ~ 4.12 -

II. Public POCs for CVE-2021-28699

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III. Intelligence Information for CVE-2021-28699

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Vendor Advisories for CVE-2021-28699 (2)

Mailing List Discussions for CVE-2021-28699 (3)

Other References for CVE-2021-28699 (1)

Same Patch Batch · Xen · 2021-08-27 · 7 CVEs total

CVE-2021-28695 Xen 安全漏洞
CVE-2021-28696 Xen 安全漏洞
CVE-2021-28694 Xen 安全漏洞
CVE-2021-28697 Xen 竞争条件问题漏洞
CVE-2021-28698 Xen 安全漏洞
CVE-2021-28700 Xen 安全漏洞

IV. Related Vulnerabilities

Same product: xen
Same vendor: Xen

V. Comments for CVE-2021-28699

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