Vulnerability in Xen (CVE-2017-14318)
Summary
Vulnerability in Xen (CVE-2017-14318). Risk of unauthorized operations or information disclosure. Exploitable via __gnttab_cache_flush.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2017-14318 has been found in Xen.
Attackers can target a specific entry point like __gnttab_cache_flush over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Xen CVE-2017-14318" on the vendor's site.
CVE-2017-14318 (Xen) — CWE-476 / CVSS v3 6.5
Attack vector: local / no user interaction
Attack surface: __gnttab_cache_flush / DOMID_XEN / DOMID_IO / DOMID_COW
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-476) exists in Xen. Attackers reach the vulnerable code path via __gnttab_cache_flush.
Check the vendor advisory for the affected versions of Xen. Attack surface: __gnttab_cache_flush / DOMID_XEN / DOMID_IO / DOMID_COW.
Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Xen' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Xen' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Xenを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2017-14318 xen Fixed in: 4.9.0-r4
- Debian DEBIAN-CVE-2017-14318 xen Fixed in: 4.8.2+xsa245-0+deb9u1
References
- advisory securityfocus.com
- advisory securitytracker.com
- patch xenbits.xen.org
- web support.citrix.com
- web debian.org