Upgrading to Ubuntu 14.04, RHEL 7 and CentOS 7 Guests

Customers who wish to upgrade existing Linux guests to versions which now operate in HVM mode that is, RHEL7, CentOS 7, and Ubuntu 14.04 should perform an in-guest upgrade. At this point, the upgraded Guest will only run in PV mode - which is not supported and has known issues. Customers should r...

Xen Multiple Vulnerabilities (XSA-186, XSA-187)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by multiple vulnerabilities : - A flaw exists due to improper handling of instruction pointer truncation when emulating HVM instructions. An attacker on the guest can exploit this to gain...

Fedora 23 : xen (2016-1c3374bcb9)

x86: Disallow L3 recursive pagetable for 32-bit PV guests XSA-185, CVE-2016-7092 1374470 x86: Mishandling of instruction pointer truncation during emulation XSA-186, CVE-2016-7093 1374471 x86 HVM: Overflow of shctxt-segreg XSA-187, CVE-2016-7094 1374473 Note that Tenable Network Security has...

CVE-2016-7094

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

DEBIAN-CVE-2016-7094

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

Design/Logic Flaw

Xen 4.5.3, 4.6.3, and 4.7.x allow local HVM guest OS administrators to overwrite hypervisor memory and consequently gain host OS privileges by leveraging mishandling of instruction pointer truncation during emulation...

CVE-2016-7094

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

Buffer overflow

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

CVE-2016-7094

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

CVE-2016-7093: Undefined Security Weakness

Xen 4.5.3, 4.6.3, and 4.7.x allow local HVM guest OS administrators to overwrite hypervisor memory and consequently gain host OS privileges by leveraging mishandling of instruction pointer truncation during emulation...

Fedora 24 : xen (2016-7d2c67d1f5)

x86: Disallow L3 recursive pagetable for 32-bit PV guests XSA-185, CVE-2016-7092 1374470 x86: Mishandling of instruction pointer truncation during emulation XSA-186, CVE-2016-7093 1374471 x86 HVM: Overflow of shctxt-segreg XSA-187, CVE-2016-7094 1374473 Note that Tenable Network Security has...

[SECURITY] [DSA 3663-1] xen security update

------------------------------------------------------------------------- Debian Security Advisory DSA-3663-1 [email protected] https://www.debian.org/security/ Salvatore Bonaccorso September 09, 2016 https://www.debian.org/security/faq -...

Debian Security Advisory DSA 3663-1 (xen - security update)

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-7092 XSA-185 Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba discovered a flaw in the handling of L3 pagetable entries,...

Xen release 4 an important vulnerability advisories-vulnerability warning-the black bar safety net

! Today the Xen Update 4 important patch announcement XSA-1 8 5, AND XSA-1 8 6, AND XSA-1 8 7, AND XSA-1 8 8, wherein the XSA-1 8 5, AND XSA-1 8 6, AND XSA-1 8 8 can be caused to include PV, HVM mode in Xen host is penetrated, the recommended use of the Xen Platform Update Now patch. XSA-1 8 5CVE...

DSA-3663-1 xen - security update

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PT-2016-7212

Name of the Vulnerable Software and Affected Versions Xen versions 4.7.x and earlier Description A buffer overflow issue allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update. Recommendations For Xen versions 4.7.x an...

CVE-2016-7094

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update...

CVE-2016-7093

Xen 4.5.3, 4.6.3, and 4.7.x allow local HVM guest OS administrators to overwrite hypervisor memory and consequently gain host OS privileges by leveraging mishandling of instruction pointer truncation during emulation...

x86 HVM: Overflow of sh_ctxt->seg_reg[]

ISSUE DESCRIPTION x86 HVM guests running with shadow paging use a subset of the x86 emulator to handle the guest writing to its own pagetables. There are situations a guest can provoke which result in exceeding the space allocated for internal state. IMPACT A malicious HVM guest administrator can...

x86: Mishandling of instruction pointer truncation during emulation

ISSUE DESCRIPTION When emulating HVM instructions, Xen uses a small i-cache for fetches from guest memory. The code that handles cache misses does not check if the address from which it fetched lies within the cache before blindly writing to it. As such it is possible for the guest to overwrite...