Threat Outbreak Alert RuleID27049: Email Messages Distributing Malicious Software on January 3, 2017

Medium Alert ID: 52245 First Published: 2017 January 3 16:57 GMT Version: 1 Summary Cisco Security has detected significant activity related to spam email messages distributing malicious software. Email messages that are related to this threat RuleID27049 may contain the following files: Name |...

xen-kernel -- x86 PV guests may be able to mask interrupts

The Xen Project reports: Certain PV guest kernel operations page table writes in particular need emulation, and use Xen's general x86 instruction emulator. This allows a malicious guest kernel which asynchronously modifies its instruction stream to effect the clearing of EFLAGS.IF from the state...

x86 CMPXCHG8B emulation fails to ignore operand size override

ISSUE DESCRIPTION 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 on the...

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...

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...

DEBIAN-CVE-2016-8630

The x86decodeinsn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service host OS crash via a certain use of a ModR/M byte in an undefined instruction...

CVE-2016-8630

The x86decodeinsn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service host OS crash via a certain use of a ModR/M byte in an undefined instruction...

CVE-2016-8630

The x86decodeinsn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service host OS crash via a certain use of a ModR/M byte in an undefined instruction...

UBUNTU-CVE-2016-8630

The x86decodeinsn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is enabled, allows local users to cause a denial of service host OS crash via a certain use of a ModR/M byte in an undefined instruction...

xen-kernel -- x86 64-bit bit test instruction emulation broken

The Xen Project reports: 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. ...

Exploit for Race Condition in Canonical Ubuntu_Linux

CVE-2016-5195...

Fedora 25 : xen (2016-1d8429b89f)

fix build problem with glibc 2.24 x86: Disallow L3 recursive pagetable for 32-bit PV guests XSA-185, CVE-2016-7092 x86: Mishandling of instruction pointer truncation during emulation XSA-186, CVE-2016-7093 x86 HVM: Overflow of shctxt-segreg XSA-187, CVE-2016-7094 pandoc documentation has dependen...

shopify-scripts: Struct type confusion RCE

Heya! I've been poking at mruby a bit more and I've found a vulnerability that allows an attacker to take control of the instruction pointer. I've attached a proof of concept script that when run in mruby will jump to 0x0000133713371337 and segfault. While the proof of concept script just jumps t...

PT-2016-7533 · Linux +5 · Linux Kernel +5

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 4.8.7 Description: The issue allows local users to cause a denial of service, resulting in a host OS crash. This is achieved through a certain use of a ModR/M byte in an undefined instruction when KVM is enabled...

Microsoft Windows - win32k.sys TTF Processing RCVT TrueType Instruction Handler Out-of-Bounds Read (MS16-120)

Microsoft Windows - win32k.sys TTF Processing RCVT TrueType Instruction Handler Out-of-Bounds Read MS16-120 Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=864 We have encountered a number of Windows kernel crashes in the win32k!itrpGetCVTEntryFast function called by the handler...

SUSE-SU-2016:2507-1 Security update for xen

This update for xen fixes several issues. These security issues were fixed: - CVE-2016-7092: The getpagefroml3e function in arch/x86/mm.c in Xen allowed local 32-bit PV guest OS administrators to gain host OS privileges via vectors related to L3 recursive pagetables bsc995785 - CVE-2016-7093: Xen...

CVE-2016-7777

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it...

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...