xen: multiple vulnerabilities
| Package(s): | xen | CVE #(s): | CVE-2016-7092 CVE-2016-7094 CVE-2016-7154 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Created: | September 9, 2016 | Updated: | September 14, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Description: | From the Debian advisory: CVE-2016-7092 (XSA-185) Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba discovered a flaw in the handling of L3 pagetable entries, allowing a malicious 32-bit PV guest administrator can escalate their privilege to that of the host. CVE-2016-7094 (XSA-187) x86 HVM guests running with shadow paging use a subset of the x86 emulator to handle the guest writing to its own pagetables. Andrew Cooper of Citrix discovered that there are situations a guest can provoke which result in exceeding the space allocated for internal state. A malicious HVM guest administrator can cause Xen to fail a bug check, causing a denial of service to the host. CVE-2016-7154 (XSA-188) Mikhail Gorobets of Advanced Threat Research, Intel Security discovered a use after free flaw in the FIFO event channel code. A malicious guest administrator can crash the host, leading to a denial of service. Arbitrary code execution (and therefore privilege escalation), and information leaks, cannot be excluded. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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