xen-kernel -- x86: Disallow L3 recursive pagetable for 32-bit PV guests

The Xen Project reports: On real hardware, a 32-bit PAE guest must leave the USER and RW bit clear in L3 pagetable entries, but the pagetable walk behaves as if they were set. The L3 entries are cached in processor registers, and don't actually form part of the pagewalk. When running a 32-bit PV...

Ruby: Arbitrary heap overread in strscan on 32 bit Ruby, patch included

ruby require 'strscan' x = 'x' 0x7FFFFFFE s = StringScanner.newx s.pos = 0x7FFFFFFD t = s.peek40000 t.eachbyte do |i| if i != 0 print i.chr end end Run: sh ./ruby r.rb | strings My output: @ ;@VTdBE...

Tor: potential memory corruption in or/buffers.c (particularly on 32 bit)

In or/buffer.s.c: c / Return the allocation size we'd like to use to hold target bytes. / static inline sizet preferredchunksizesizet target sizet sz = MINCHUNKALLOC; while CHUNKSIZEWITHALLOCsz include define FLEXIBLEARRAYMEMBER // define DEBUGCHUNKALLOC / A single chunk on a buffer. / typedef...

UAF vulnerability description-vulnerability warning-the black bar safety net

UAF Use After Freevulnerability is a memory corruption vulnerability,usually present in the browser. Recently,the browser's new version Added a series of controls,which also makes use of these vulnerabilities becomes more difficult. Nevertheless,they still seem to exist. This article mainly will ...

Microsoft Windows Kernel 'Win32k.sys' CVE-2016-3311 Local Privilege Escalation Vulnerability

Description Microsoft Windows is prone to a local privilege-escalation vulnerability that occurs in the Windows kernel. A local attacker can exploit this issue to execute arbitrary code in kernel mode with elevated privileges. Technologies Affected Microsoft Windows 10 Version 1607 for 32-bit...

Microsoft Windows Kernel 'Win32k.sys' CVE-2016-3310 Local Privilege Escalation Vulnerability

Description Microsoft Windows is prone to a local privilege-escalation vulnerability that occurs in the Windows kernel. A local attacker can exploit this issue to execute arbitrary code in kernel mode with elevated privileges. Technologies Affected Microsoft Windows 10 Version 1607 for 32-bit...

Dolby Audio X2 (DAX2) privilege escalation

A vulnerability has been identified with the file permissions for the Dolby DAX2 application programming interface API that could allow a local user to run files with system level privileges. Mitigation Strategy for Customers what you should do to protect yourself: Lenovo is currently working wit...

CVE-2016-6259

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention SMAP whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service hypervisor and VM crash by triggering a safety check...

CVE-2016-6259

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention SMAP whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service hypervisor and VM crash by triggering a safety check...

CVE-2016-6258

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries...

Design/Logic Flaw

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention SMAP whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service hypervisor and VM crash by triggering a safety check...

CVE-2016-6258

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries...

CVE-2016-6259

CVE-2016-6259 affects Xen 4.5.x–4.7.x where SMAP whitelisting is not implemented for 32-bit exception/event delivery. This enables local 32-bit PV guests to trigger a safety check that can crash the hypervisor or VMs (DoS). The root cause is missing Supervisor Mode Access Prevention whitelisting ...

CVE-2016-6259

Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention SMAP whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service hypervisor and VM crash by triggering a safety check...

FreeBSD : xen-kernel -- x86: Missing SMAP whitelisting in 32-bit exception / event delivery (04cf89e3-5854-11e6-b334-002590263bf5)

The Xen Project reports : Supervisor Mode Access Prevention is a hardware feature designed to make an Operating System more robust, by raising a pagefault rather than accidentally following a pointer into userspace. However, legitimate accesses into userspace require whitelisting, and the excepti...

WebKit - TypedArray.fill Memory Corruption

length; unsigned begin = argumentClampedIndexFromStartOrEndexec, 1, length; unsigned end = argumentClampedIndexFromStartOrEndexec, 2, length, length; if end thisValue; if !thisObject-setRangeToValueexec, begin, end, valueToInsert return JSValue::encodejsUndefined; argumentClampedIndexFromStartOrE...

WebKit - TypedArray.fill Memory Corruption

WebKit - TypedArray.fill Memory Corruption length; unsigned begin = argumentClampedIndexFromStartOrEndexec, 1, length; unsigned end = argumentClampedIndexFromStartOrEndexec, 2, length, length; if end thisValue; if !thisObject-setRangeToValueexec, begin, end, valueToInsert return...

Xen Denial of Service Vulnerability (CNVD-2016-05534)

Xen is an open source virtual machine monitor product developed at the University of Cambridge in the United Kingdom. Xen has a denial-of-service vulnerability, which can be exploited by an attacker using a PV-mode x86 32-bit hardware platform to trigger a security check that will cause the VM...

x86: Missing SMAP whitelisting in 32-bit exception / event delivery

ISSUE DESCRIPTION Supervisor Mode Access Prevention is a hardware feature designed to make an Operating System more robust, by raising a pagefault rather than accidentally following a pointer into userspace. However, legitimate accesses into userspace require whitelisting, and the exception...

xen-kernel -- x86: Missing SMAP whitelisting in 32-bit exception / event delivery

The Xen Project reports: Supervisor Mode Access Prevention is a hardware feature designed to make an Operating System more robust, by raising a pagefault rather than accidentally following a pointer into userspace. However, legitimate accesses into userspace require whitelisting, and the exceptio...