CVE-2019-18422
描述
An issue was discovered in Xen through 4.12.x allowing ARM guest OS users to cause a denial of service or gain privileges by leveraging the erroneous enabling of interrupts. Interrupts are unconditionally unmasked in exception handlers. When an exception occurs on an ARM system which is handled without changing processor level, some interrupts are unconditionally enabled during exception entry. So exceptions which occur when interrupts are masked will effectively unmask the interrupts. A malicious guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified.
如何修補 CVE-2019-18422
要修補 CVE-2019-18422,請將受影響套件升級到下列已修補版本。
- —升級至 4.12.1-r1 或更新版本
- —升級至 4.11.3+24-g14b62ab3e5-1 或更新版本
CVE-2019-18422 正在被利用嗎?
低 — EPSS 為 1.8%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 4.12.1-r1
- from 0, < 4.11.3+24-g14b62ab3e5-1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |