A flaw was found in Linux kernel’s KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host’s userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.
redhat
CVE-2018-10863
It was discovered that redhat-certification 7 is not properly configured and it lists all files and directories in the /var/www/rhcert/store/transfer directory, through the /rhcert-transfer URL. An unauthorized attacker may use this flaw to gather sensible information.
CVE-2018-10864
An uncontrolled resource consumption flaw has been discovered in redhat-certification in the way documents are loaded. A remote attacker may provide an existing but invalid XML file which would be opened and never closed, possibly producing a Denial of Service.
CVE-2018-10865
It was discovered that the /configuration view of redhat-certification 7 does not perform an authorization check and it allows an unauthenticated user to call a “restart” RPC method on any host accessible by the system, even if not belonging to him.
CVE-2018-10866
It was discovered that the /configuration view of redhat-certification 7 does not perform an authorization check and it allows an unauthenticated user to remove a “system” file, that is an xml file with host related information, not belonging to him.
CVE-2018-10867
Files are accessible without restrictions from the /update/results page of redhat-certification 7 package, allowing an attacker to remove any file accessible by the apached user.