xen-kernel -- x86 CMPXCHG8B emulation fails to ignore operand size override

The Xen Project reports: The x86 instruction CMPXCHG8B is supposed to ignore legacy operand size overrides; it only honors the REX.W override making it CMPXCHG16B. So, the operand size is always 8 or 16. When support for CMPXCHG16B emulation was added to the instruction emulator, this restriction...

Google Chrome (Fedora 25 / Ubuntu 16.04) - 'tracker-extract' / 'gnome-video-thumbnailer' + 'totem' Drive-By Download

Source: https://scarybeastsecurity.blogspot.com/2016/12/redux-compromising-linux-using-snes.html Overview Full reliable 0day drive-by exploit against Fedora 25 + Google Chrome, by breaking out of Super Nintendo Entertainment System emulation via cascading side effects from a subtle and interestin...

CVE-2016-9911

Quick Emulator Qemu built with the USB EHCI Emulation support is vulnerable to a memory leakage issue. It could occur while processing packet data in 'ehciinittransfer'. A guest user/process could use this issue to leak host memory, resulting in DoS for a host...

Xen Multiple Vulnerabilities (XSA-191 - XSA-198)

According to its self-reported version number, the Xen hypervisor installed on the remote host is missing a security update. It is, therefore, affected by multiple vulnerabilities : - A flaw exists in the injectswint function in x86emulate.c due to improper handling of the format of IDT lookups...

Debian DSA-3729-1 : xen - security update

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2016-7777 XSA-190 Jan Beulich from SUSE discovered that Xen does not properly honor CR0.TS and CR0.EM for x86 HVM guests, potentially...

Debian Security Advisory DSA 3729-1 (xen - security update)

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-7777 XSA-190 Jan Beulich from SUSE discovered that Xen does not properly honor CR0.TS and CR0.EM for x86 HVM guests, potentially allowi...

The firmware binary code of the simulation and exploit technology-vulnerability warning-the black bar safety net

In a previous article, we introduced a firmware analysis and extraction of the file system method. In this article we will further introduce how to in-depth analysis of firmware binaries, and then use its common security vulnerabilities. In this paper, we will relate to the following as shown in...

FreeBSD : xen-kernel -- x86 segment base write emulation lacking canonical address checks (53dbd096-ba4d-11e6-ae1b-002590263bf5)

The Xen Project reports : Both writes to the FS and GS register base MSRs as well as the WRFSBASE and WRGSBASE instructions require their input values to be canonical, or a GP fault will be raised. When the use of those instructions by the hypervisor was enabled, the previous guard against GP...

FreeBSD : xen-kernel -- x86: Mishandling of instruction pointer truncation during emulation (49211361-ba4d-11e6-ae1b-002590263bf5)

The Xen Project reports : 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...

Fedora 24 : xen (2016-95c104a4c6)

xen : various security flaws 1397383 x86 null segments not always treated as unusable XSA-191, CVE-2016-9386 x86 task switch to VM86 mode mis-handled XSA-192, CVE-2016-9382 x86 segment base write emulation lacking canonical address checks XSA-193, CVE-2016-9385 x86 64-bit bit test instruction...

SUSE-SU-2016:2988-1 Security update for qemu

This update for qemu fixes the following issues: - Patch queue updated from https://gitlab.suse.de/virtualization/qemu.git SLE12-SP1 - Change package post script udevadm trigger calls to be device specific bsc1002116 - Address various security/stability issues Fix OOB access in...

openSUSE Security Update : virtualbox (openSUSE-2016-1366)

This update for virtualbox fixes the following issues : - Fixes CVE-2016-5501,CVE-2016-5538,CVE-2016-5605,CVE-2016-5608, CVE-2016-5610,CVE-2016-5611,CVE-2016-5613 bsc1005621 - Add patch to limit number of simultaneous make jobs. - Version bump to 5.1.8 released 2016-10-18 by Oracle This is a...

Debian DLA-720-1 : xen security update

Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : CVE-2016-9379, CVE-2016-9380 XSA-198 pygrub, the boot loader emulator, fails to quote or sanity check its results when reporting them to its...

PT-2017-10102

Name of the Vulnerable Software and Affected Versions Xen versions 4.4.x through 4.7.x Description The issue allows local x86 PV guest OS administrators to cause a denial of service, resulting in a host crash, by exploiting the lack of canonical address checks in the x86 segment base write...

SUSE-SU-2016:2902-1 Security update for kvm

This update for kvm fixes the following issues: - Address various security/stability issues Fix OOB access in xlnx.xpx-ethernetlite emulation CVE-2016-7161 bsc1001151 Fix OOB access in VMware SVGA emulation CVE-2016-7170 bsc998516 Fix DOS in ColdFire Fast Ethernet Controller emulation CVE-2016-79...

[SECURITY] [DLA 720-1] xen security update

Package : xen Version : 4.1.6.lts1-4 CVE ID : CVE-2016-9379 CVE-2016-9380 CVE-2016-9381 CVE-2016-9382 CVE-2016-9383 CVE-2016-9386 Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-9379,...

CVE-2016-9385

The x86 segment base write emulation functionality in Xen 4.4.x through 4.7.x allows local x86 PV guest OS administrators to cause a denial of service host crash by leveraging lack of canonical address checks...

x86 64-bit bit test instruction emulation broken

ISSUE DESCRIPTION The x86 instructions BT, BTC, BTR, and BTS, when used with a destination memory operand and a source register rather than an immediate operand, access a memory location offset from that specified by the memory operand as specified by the high bits of the register source. When Xe...

x86 segment base write emulation lacking canonical address checks

ISSUE DESCRIPTION Both writes to the FS and GS register base MSRs as well as the WRFSBASE and WRGSBASE instructions require their input values to be canonical, or a GP fault will be raised. When the use of those instructions by the hypervisor was enabled, the previous guard against GP faults havi...

x86 software interrupt injection mis-handled

ISSUE DESCRIPTION There are two closely-related bugs. When Xen emulates instructions which generate software interrupts it needs to perform a privilege check involving an IDT lookup. This check is sometimes erroneously conducted as if the IDT had the format for a 32-bit guest, when in fact it is ...