Pandavirtualization: Exploiting the Xen hypervisor

Posted by Jann Horn, Project Zero On 2017-03-14, I reported a bug to Xen's security team that permits an attacker with control over the kernel of a paravirtualized x86-64 Xen guest to break out of the hypervisor and gain full control over the machine's physical memory. The Xen Project publicly...

[SECURITY] Fedora 25 Update: xen-4.7.2-4.fc25

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

ALPINE-CVE-2017-7228

An issue known as XSA-212 was discovered in Xen, with fixes available for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix introduced an insufficient check on XENMEMexchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arra...

[SECURITY] Fedora 25 Update: xen-4.7.2-2.fc25

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 24 Update: xen-4.6.4-8.fc24

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 25 Update: xen-4.7.1-9.fc25

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

DEBIAN-CVE-2016-9818

Xen through 4.7.x allows local ARM guest OS users to cause a denial of service host crash via vectors involving an asynchronous abort while at HYP...

ALPINE-CVE-2016-9815

Xen through 4.7.x allows local ARM guest OS users to cause a denial of service host panic by sending an asynchronous abort...

[SECURITY] Fedora 24 Update: xen-4.6.4-7.fc24

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

Xen Guest Destruction Memory Leak DoS (XSA-207)

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 a memory leak issue due to improper cleanup during guest destruction. A guest attacker can exploit this issue, via frequent rebooting, to...

[SECURITY] Fedora 25 Update: xen-4.7.1-8.fc25

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 25 Update: xen-4.7.1-7.fc25

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

Xen SYSCALL singlestep Handling Privilege Escalation (XSA-204)

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 a privilege elevation vulnerability in the instruction emulator when handling SYSCALL by single-stepping applications. This is due to incorrec...

Xen CMPXCHG8B Emulation Information Disclosure (XSA-200)

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 an information disclosure vulnerability due to a flaw in the x86 instruction CMPXCHG8B when handling prefixes. This is triggered because legac...

DEBIAN-CVE-2016-10025

VMFUNC emulation in Xen 4.6.x through 4.8.x on x86 systems using AMD virtualization extensions aka SVM allows local HVM guest OS users to cause a denial of service hypervisor crash by leveraging a missing NULL pointer check...

ALPINE-CVE-2016-10025

VMFUNC emulation in Xen 4.6.x through 4.8.x on x86 systems using AMD virtualization extensions aka SVM allows local HVM guest OS users to cause a denial of service hypervisor crash by leveraging a missing NULL pointer check...

CVE-2016-10024

Xen through 4.8.x allows local x86 PV guest OS kernel administrators to cause a denial of service host hang or crash by modifying the instruction stream asynchronously while performing certain kernel operations...

UBUNTU-CVE-2016-10025

VMFUNC emulation in Xen 4.6.x through 4.8.x on x86 systems using AMD virtualization extensions aka SVM allows local HVM guest OS users to cause a denial of service hypervisor crash by leveraging a missing NULL pointer check...

ALPINE-CVE-2016-10013

Xen through 4.8.x allows local 64-bit x86 HVM guest OS users to gain privileges by leveraging mishandling of SYSCALL singlestep during emulation...

DEBIAN-CVE-2016-9380

The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file...