CVE-2017-14318

描述

An issue was discovered in Xen 4.5.x through 4.9.x. The function `__gnttab_cache_flush` handles GNTTABOP_cache_flush grant table operations. It checks to see if the calling domain is the owner of the page that is to be operated on. If it is not, the owner's grant table is checked to see if a grant mapping to the calling domain exists for the page in question. However, the function does not check to see if the owning domain actually has a grant table or not. Some special domains, such as `DOMID_XEN`, `DOMID_IO` and `DOMID_COW` are created without grant tables. Hence, if __gnttab_cache_flush operates on a page owned by these special domains, it will attempt to dereference a NULL pointer in the domain struct.

如何修補 CVE-2017-14318

要修補 CVE-2017-14318,請將受影響套件升級到下列已修補版本。

• —升級至 4.9.0-r4 或更新版本
• —升級至 4.8.2+xsa245-0+deb9u1 或更新版本

CVE-2017-14318 正在被利用嗎?

低 — EPSS 為 0.4%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• from 0, < 4.9.0-r4
• from 0, < 4.8.2+xsa245-0+deb9u1

CVSS 分數

參考連結(2)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2017-14318
• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2017-14318