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CVE-2021-28697

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通过 Xen 的授予表 V2 状态页面绕过限制，以便升级其在主机系统上的特权。

AI Predicted 5.8 Difficulty: Hard EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-28697

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
grant table v2 status pages may remain accessible after de-allocation Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes.
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 竞争条件问题漏洞
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通过 Xen 的授予表 V2 状态页面绕过限制，以便升级其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
Xen xen xen-unstable -
Xen xen unspecified ~ 4.12 -
Xen xen unspecified ~ 4.12 -
Xen xen 4.15.x -

II. Public POCs for CVE-2021-28697

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III. Intelligence Information for CVE-2021-28697

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Vendor Advisories for CVE-2021-28697 (2)

Mailing List Discussions for CVE-2021-28697 (3)

Other References for CVE-2021-28697 (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-2021-28698 Xen 安全漏洞
CVE-2021-28699 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-2021-28697

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