Vulnerability Details : CVE-2015-8555
Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.
Vulnerability category: Information leak
Exploit prediction scoring system (EPSS) score for CVE-2015-8555
Probability of exploitation activity in the next 30 days: 0.31%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 66 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2015-8555
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST |
8.6
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
3.9
|
4.0
|
NIST |
CWE ids for CVE-2015-8555
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The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.Assigned by: nvd@nist.gov (Primary)
References for CVE-2015-8555
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http://www.securitytracker.com/id/1034477
Xen x86 FPU/XMM Stack/Register Initialization Flaw Lets Local Users on a Guest System Obtain Potentially Sensitive Information from Other Domains on the Target System - SecurityTracker
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http://support.citrix.com/article/CTX203879
Citrix XenServer Multiple Security Updates
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https://security.gentoo.org/glsa/201604-03
Xen: Multiple vulnerabilities (GLSA 201604-03) — Gentoo security
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http://xenbits.xen.org/xsa/advisory-165.html
XSA-165 - Xen Security AdvisoriesPatch;Vendor Advisory
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http://www.debian.org/security/2016/dsa-3519
Debian -- Security Information -- DSA-3519-1 xen
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http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
Oracle VM Server for x86 Bulletin - July 2016
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http://www.securityfocus.com/bid/79543
Xen CVE-2015-8555 Information Disclosure Vulnerability
Products affected by CVE-2015-8555
- cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.4.1:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.3.3:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.3.4:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.4.2:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.4.3:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.4.4:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:*