CVE-2024-45818— Xen 安全漏洞
一分钟漏洞结论
影响对象
Xen Xen
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Xen是Xen开源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，该漏洞源于hypervisor中VGA内存访问加速代码的锁定规则设计不当，以及历史问题处理不彻底导致的死锁问题。
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution
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一、 漏洞 CVE-2024-45818 基础信息
漏洞信息
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Vulnerability Title
Deadlock in x86 HVM standard VGA handling
来源: CVE Program / CVE List V5
Vulnerability Description
The hypervisor contains code to accelerate VGA memory accesses for HVM
guests, when the (virtual) VGA is in "standard" mode. Locking involved
there has an unusual discipline, leaving a lock acquired past the
return from the function that acquired it. This behavior results in a
problem when emulating an instruction with two memory accesses, both of
which touch VGA memory (plus some further constraints which aren't
relevant here). When emulating the 2nd access, the lock that is already
being held would be attempted to be re-acquired, resulting in a
deadlock.
This deadlock was already found when the code was first introduced, but
was analysed incorrectly and the fix was incomplete. Analysis in light
of the new finding cannot find a way to make the existing locking
discipline work.
In staging, this logic has all been removed because it was discovered
to be accidentally disabled since Xen 4.7. Therefore, we are fixing the
locking problem by backporting the removal of most of the feature. Note
that even with the feature disabled, the lock would still be acquired
for any accesses to the VGA MMIO region.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Xen是Xen开源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，该漏洞源于hypervisor中VGA内存访问加速代码的锁定规则设计不当，以及历史问题处理不彻底导致的死锁问题。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-45818 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-45818 厂商安全公告 (1)
同批安全公告 · Xen · 2024-12-19 · 共 3 条
| CVE-2024-2201 | Intel CPU 安全漏洞 | |
| CVE-2024-45819 | Xen 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2024-45818
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