The fpu_fxrstor function in arch/x86/i387.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.
Published : 2016-04-13 16:59 Updated : 2019-02-21 17:42
CVSS Score More info
Score 1.7 / 10
A vulnerability exploitable with only local access requires the attacker to have either physical access to the vulnerable system or a local (shell) account. Examples of locally exploitable vulnerabilities are peripheral attacks such as Firewire/USB DMA attacks, and local privilege escalations (e.g., sudo).
Specialized access conditions or extenuating circumstances do not exist. The following are examples:
- The affected product typically requires access to a wide range of systems and users, possibly anonymous and untrusted (e.g., Internet-facing web or mail server).
- The affected configuration is default or ubiquitous.
- The attack can be performed manually and requires little skill or additional information gathering.
- The race condition is a lazy one (i.e., it is technically a race but easily winnable).
The vulnerability requires an attacker to be logged into the system (such as at a command line or via a desktop session or web interface).
There is considerable informational disclosure. Access to some system files is possible, but the attacker does not have control over what is obtained, or the scope of the loss is constrained. An example is a vulnerability that divulges only certain tables in a database.
There is no impact to the integrity of the system.
There is no impact to the availability of the system.
|CWE-284||Improper Access Control||The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.||CVE|
|CWE-200||Information Exposure||An information exposure is the intentional or unintentional disclosure of information to an actor that is not explicitly authorized to have access to that information.||CVE|
History of changes