Information Disclosure in Xen PV guest before Xen (CVE-2017-7995)
Summary
Vulnerability in Xen PV guest before Xen (CVE-2017-7995). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the get_user function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL.
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-2017-7995 has been found in Xen PV guest before Xen.
Risk of unauthorized operations or information disclosure. CVSS score: 3.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Xen PV guest before Xen CVE-2017-7995" on the vendor's site.
CVE-2017-7995 (Xen PV guest before Xen) — CWE-200 / CVSS v3 3.8
Attack vector: local / no user interaction
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.
Information disclosure (CWE-200) exists in Xen PV guest before Xen.
Check the vendor advisory for the affected versions of Xen PV guest before Xen.
Severity: Low (CVSS 3.8/10). 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. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Xen PV guest before Xen を使っているサービスとバージョンを洗い出す。
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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
- Debian DEBIAN-CVE-2017-7995 xen Fixed in: 4.3.0-1
References
- advisory lists.opensuse.org
- advisory securityfocus.com
- advisory bugzilla.suse.com