Information disclosure in Oracle Vm Server
CVE-2016-3158
The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.8 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Oracle Vm Server — versions 3.3, 3.4
- Xen
- Fedoraproject Fedora — versions 22, 23
Weakness classification (CWE)
References
- www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html (Vendor Advisory)
- lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/85714 (VDB Entry, Third Party Advisory, vdb-entry)
- xenbits.xen.org/xsa/xsa172-4.3.patch (Patch)
- xenbits.xen.org/xsa/advisory-172.html (Vendor Advisory)
- lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html (vendor-advisory, Third Party Advisory)
- xenbits.xen.org/xsa/xsa172.patch (Patch)
- www.securitytracker.com/id/1035435 (VDB Entry, Third Party Advisory, vdb-entry)
- support.citrix.com/article/CTX209443
- www.debian.org/security/2016/dsa-3554 (vendor-advisory)
Frequently asked questions
- What is CVE-2016-3158?
- CVE-2016-3158 is a low-severity vulnerability in Oracle Vm Server, classified under Information Disclosure. CVSS score: 3.8/10. Published 2016-04-13.
- How severe is CVE-2016-3158?
- Low severity. CVSS v3 base score is 3.8 out of 10.