CVE-2020-27174

In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when data is sent to the standard input. This can result in a memory leak on the microVM emulation thread, possibly occupying more memory than intended on the host...

QEMU: usb: out-of-bounds r/w access issue while processing usb packets

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU. This issue occurs while processing USB packets from a guest when USBDevice 'setuplen' exceeds its 'databuf4096' in the dotokenin, dotokenout routines. This flaw allows a guest user to crash the QEMU process,...

Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources

A flaw was found in the way KVM hypervisor handled instruction emulation for the L2 guest when nested=1 virtualization is enabled. In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to...

QEMU: usb: out-of-bounds r/w access issue while processing usb packets

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU. This issue occurs while processing USB packets from a guest when USBDevice 'setuplen' exceeds its 'databuf4096' in the dotokenin, dotokenout routines. This flaw allows a guest user to crash the QEMU process,...

Kernel: kvm: OOB memory write via kvm_dev_ioctl_get_cpuid

An out-of-bounds memory write issue was found in the way the Linux kernel's KVM hypervisor handled the 'KVMGETEMULATEDCPUID' ioctl2 request to get CPUID features emulated by the KVM hypervisor. A user or process able to access the '/dev/kvm' device could use this flaw to crash the system, resulti...

Kernel: kvm: nVMX: L2 guest may trick the L0 hypervisor to access sensitive L1 resources

A flaw was found in the way KVM hypervisor handled instruction emulation for the L2 guest when nested=1 virtualization is enabled. In the instruction emulation, the L2 guest could trick the L0 hypervisor into accessing sensitive bits of the L1 hypervisor. An L2 guest could use this flaw to...

QEMU: usb: out-of-bounds r/w access issue while processing usb packets

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU. This issue occurs while processing USB packets from a guest when USBDevice 'setuplen' exceeds its 'databuf4096' in the dotokenin, dotokenout routines. This flaw allows a guest user to crash the QEMU process,...

The pit_ioport_read function in the Programmable Interval Timer (PIT) emulation in i8254.c in KVM 83 does not properly use the pit_state data structure which allows guest OS users to cause a denial of service (host OS crash or hang) by attempting to read the /dev/port file.

...

Denial Of Service (DoS)

QEMU aka Quick Emulator is vulnerable to denial of service DoS. When built with the USB OHCI Emulation support, it allows local guest OS users to cause a denial of service infinite loop by leveraging an incorrect return value, a different vulnerability than CVE-2017-6505...

Industry-wide partnership on threat-informed defense improves security for all

MITRE Engenuity’s Center for Threat-Informed Defense has published a library of detailed plans for emulating the threat actor FIN6 which Microsoft tracks as TAAL, a collection of threat intelligence, MITRE ATT&CK data, supporting scripts, and utilities designed to enable red teams to emulate the...

Debian DSA-4760-1 : qemu - security update

Multiple security issues were discovered in QEMU, a fast processor emulator : - CVE-2020-12829 An integer overflow in the sm501 display device may result in denial of service. - CVE-2020-14364 An out-of-bounds write in the USB emulation code may result in guest-to-host code execution. -...

[SECURITY] [DSA 4760-1] qemu security update

------------------------------------------------------------------------- Debian Security Advisory DSA-4760-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff September 06, 2020 https://www.debian.org/security/faq -...

CVE-2020-24385

In MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7, a NULL pointer dereference was found in the Linux emulation layer that allows attackers to crash the running kernel. During binary interaction, td-tdemuldata in sys/compat/linux/linuxemul.h is not getting initialized an...

CVE-2020-24385

In MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7, a NULL pointer dereference was found in the Linux emulation layer that allows attackers to crash the running kernel. During binary interaction, td-tdemuldata in sys/compat/linux/linuxemul.h is not getting initialized an...

Null pointer dereference

In MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7, a NULL pointer dereference was found in the Linux emulation layer that allows attackers to crash the running kernel. During binary interaction, td-tdemuldata in sys/compat/linux/linuxemul.h is not getting initialized an...

CVE-2020-24385

The CVE-2020-24385 issue affects MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7. It is a NULL pointer dereference in the Linux emulation layer. During binary interaction, td->td_emuldata in sys/compat/linux/linux_emul.h is not initialized and can return NULL from em_...

CVE-2020-24385

In MidnightBSD before 1.2.6 and 1.3 before August 2020, and FreeBSD before 7, a NULL pointer dereference was found in the Linux emulation layer that allows attackers to crash the running kernel. During binary interaction, td-tdemuldata in sys/compat/linux/linuxemul.h is not getting initialized an...

Emulation of Malicious Shellcode With Speakeasy

In order to enable emulation of malware samples at scale, we have developed the Speakeasy emulation framework. Speakeasy aims to make it as easy as possible for users who are not malware analysts to acquire triage reports in an automated way, as well as enabling reverse engineers to write custom...

Breaking Samsung firmware, or turning your S8/S9/S10 into a DIY “Proxmark”

This post is a companion to the DEF CON 28 video available here Breaking the Firmware of Samsung’s NFC Chips Recently I have been looking into how to push the capabilities of my old smartphones beyond what you could traditionally do just by rooting it. Smartphones contain huge amounts of hardware...

An integer overflow was found in QEMU 4.0.1 through 4.2.0 in the way it implemented ATI VGA emulation. This flaw occurs in the ati_2d_blt() routine in hw/display/ati-2d.c while handling MMIO write operations through the ati_mm_write() callback. A malicious guest could abuse this flaw to crash the QEMU process resulting in a denial of service.

...