QEMU heap overflow flaw while processing certain ATAPI commands.

ISSUE DESCRIPTION The QEMU security team has predisclosed the following advisory: A heap overflow flaw was found in the way QEMU's IDE subsystem handled I/O buffer access while processing certain ATAPI commands. A privileged guest user in a guest with CDROM drive enabled could potentially use thi...

Low: Red Hat Enhancement Advisory: elfutils bug fix and enhancement update

Updated elfutils packages that fix several bugs and add various enhancements are now available for Red Hat Enterprise Linux 6. The elfutils packages contain a number of utility programs and libraries related to the creation and maintenance of executable code. The elfutils packages have been...

FreeBSD : xen-kernel -- arm: vgic: incorrect rate limiting of guest triggered logging (912cb7f7-27df-11e5-a4a5-002590263bf5)

The Xen Project reports : On ARM systems the code which deals with virtualizing the GIC distributor would, under various circumstances, log messages on a guest accessible code path without appropriate rate limiting. A malicious guest could cause repeated logging to the hypervisor console, leading...

FreeBSD : xen-kernel -- arm: vgic-v2: GICD_SGIR is not properly emulated (785c86b1-27d6-11e5-a4a5-002590263bf5)

The Xen Project reports : When decoding a guest write to a specific register in the virtual interrupt controller Xen would treat an invalid value as a critical error and crash the host. By writing an invalid value to the GICD.SGIR register a guest can crash the host, resulting in a Denial of...

Micro:bit — A Pocket-sized Programmable Computer

The BBC has unveiled the final design of the Micro:bit — a pocket-sized computer board designed to lure U.K. school children to embedded electronics. The Micro:bit is essentially a codeable computer that lets kids get creative with technology. It measures 5cm by 4cm and will be available in...

xl command line config handling stack overflow

ISSUE DESCRIPTION The xl command line utility mishandles long configuration values when passed as command line arguments, with a buffer overrun. VULNERABLE SYSTEMS Systems built on top of xl which pass laundered or checked but otherwise untrusted configuration values onto xl's command line, witho...

vulnerability in the iret hypercall handler

ISSUE DESCRIPTION A buggy loop in Xen's compatiret function iterates the wrong way around a 32-bit index. Any 32-bit PV guest kernel can trigger this vulnerability by attempting a hypercalliret with EFLAGS.VM set. Given the use of get/putuser, and that the virtual addresses in question are...

Potential unintended writes to host MSI message data field via qemu

ISSUE DESCRIPTION Logic is in place to avoid writes to certain host config space fields when the guest must nevertheless be able to access their virtual counterparts. A bug in how this logic deals with accesses spanning multiple fields allows the guest to write to the host MSI message data field...

CHIP — The World's First $9 Computer

Wait! What? A $9 computer? This is something magical. A Californian startup lead by Dave Rauchwerk is currently seeking crowdfunding on Kickstarter to create a computer that will cost as much as $9 or £6. The new microcomputer, dubbed CHIP, is a tiny, Linux-based, super-cheap computer that's...

Fedora 21 : v8-3.14.5.10-18.fc21 (2015-6845)

Fix for ARM-only CVE-2014-3152 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. %NASLMINLEVEL 70300 C...

Fedora 22 : v8-3.14.5.10-18.fc22 (2015-6890)

Fix for ARM-only CVE-2014-3152 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. %NASLMINLEVEL 70300 C...

Linux ASLR mmap weakness: Reducing entropy by half

A bug in Linux ASLR implementation has been found. The issue is that the mmap base address for processes is not properly randomized on some architectures due to an improper bit-mask manipulation. Affected systems have reduced the mmap area entropy of the processes by half. The number of possible...

Vulnerabilities in the Debian GNU/Linux operating system that allow a remote attacker to compromise the confidentiality of protected information

The Linux-headers-2.6.18-4-all-arm package of the Debian GNU/Linux operating system has multiple vulnerabilities. Exploitation of these vulnerabilities may lead to a violation of the confidentiality of protected information. These vulnerabilities can be exploited remotely...

Vulnerabilities of the Debian GNU/Linux operating system that allow a remote attacker to compromise the accessibility of protected information

Multiple vulnerabilities exist in the kernel-patch-2.4.27-arm operating system of the Debian GNU/Linux distribution. Exploitation of these vulnerabilities may lead to a violation of the accessibility of protected information. These vulnerabilities can be exploited remotely...

BackBox Linux 4.2 - Ubuntu-based Linux Distribution Penetration Test and Security Assessment

BackBox is a Linux distribution based on Ubuntu. It has been developed to perform penetration tests and security assessments. Designed to be fast, easy to use and provide a minimal yet complete desktop environment, thanks to its own software repositories, always being updated to the latest stable...

Information leak through XEN_DOMCTL_gettscinfo

ISSUE DESCRIPTION The handler for XENDOMCTLgettscinfo failed to initialize a padding field subsequently copied to guest memory. A similar bug existed in XENSYSCTLgetdomaininfolist, which is addressed by the patches provided here even though that operation was declared by XSA-77 not to provide...

Unmediated PCI command register access in qemu

ISSUE DESCRIPTION HVM guests are currently permitted to modify the memory and I/O decode bits in the PCI command register of devices passed through to them. Unless the device is an SR-IOV virtual function, after disabling one or both of these bits subsequent accesses to the MMIO or I/O port range...

Fedora 21 : xen-4.4.1-16.fc21 (2015-3944)

Additional patch for XSA-98 on arm64 HVM qemu unexpectedly enabling emulated VGA graphics backends XSA-119, CVE-2015-2152 Hypervisor memory corruption due to x86 emulator flaw XSA-123, CVE-2015-2151 enable building pngs from fig files which is working again, fix oxenstored.service preset...

HVM qemu unexpectedly enabling emulated VGA graphics backends

ISSUE DESCRIPTION When instantiating an emulated VGA device for an x86 HVM guest qemu will by default enable a backend to expose that device, either SDL or VNC depending on the version of qemu and the build time configuration. The libxl toolstack library does not explicitly disable these default...

Hypervisor memory corruption due to x86 emulator flaw

ISSUE DESCRIPTION Instructions with register operands ignore eventual segment overrides encoded for them. Due to an insufficiently conditional assignment such a bogus segment override can, however, corrupt a pointer used subsequently to store the result of the instruction. IMPACT A malicious gues...