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CVE-2021-28706

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中存在缓冲区错误漏洞，该漏洞源于在 x86 T 上部分成功的 P2M 更新问题[他的 CNA 信息记录与多个 CVE 相关；文本解释了哪些方面/漏洞对应于哪些 CVE。] x86 HVM 和 PVH 来宾可以在按需填充 (PoD) 模式下启动，以便为它们提供一种方法，以便以后轻松分配更多内存。访客可以通过超级调用控制单个页

AI Predicted 7.0 Difficulty: Hard EPSS 2.06% · P80

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-28706

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
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 缓冲区错误漏洞
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中存在缓冲区错误漏洞，该漏洞源于在 x86 T 上部分成功的 P2M 更新问题[他的 CNA 信息记录与多个 CVE 相关；文本解释了哪些方面/漏洞对应于哪些 CVE。] x86 HVM 和 PVH 来宾可以在按需填充 (PoD) 模式下启动，以便为它们提供一种方法，以便以后轻松分配更多内存。访客可以通过超级调用控制单个页
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 4.12.x -
Xen xen unspecified ~ 4.12 -
Xen xen xen-unstable -
Xen xen 4.13.x -

II. Public POCs for CVE-2021-28706

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-28706

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Vendor Advisories for CVE-2021-28706 (2)

Mailing List Discussions for CVE-2021-28706 (1)

Same Patch Batch · Xen · 2021-11-24 · 6 CVEs total

CVE-2021-28704 Xen 命令注入漏洞
CVE-2021-28705 Xen 输入验证错误漏洞
CVE-2021-28707 Xen 命令注入漏洞
CVE-2021-28708 Xen 命令注入漏洞
CVE-2021-28709 Xen 输入验证错误漏洞

IV. Related Vulnerabilities

Same product: xen
Same vendor: Xen

V. Comments for CVE-2021-28706

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