CVE-2017-8903

Xen through 4.8.x on 64-bit platforms mishandles page tables after an IRET hypercall, which might allow PV guest OS users to execute arbitrary code on the host OS, aka XSA-213...

Xen 64bit PV Guest - pagetable use-after-type-change Breakout Vulnerability

Exploit for linux platform in category local exploits Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1231 This is a bug in Xen that permits an attacker with control over the kernel of a 64bit X86 PV guest to write arbitrary entries into a live top-level pagetable. To prevent PV...

Xen 64bit PV Guest - pagetable use-after-type-change Breakout

Xen 64bit PV Guest - pagetable use-after-type-change Breakout Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1231 This is a bug in Xen that permits an attacker with control over the kernel of a 64bit X86 PV guest to write arbitrary entries into a live top-level pagetable. To...

CVE-2017-7995

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

Information disclosure

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

CVE-2017-7995

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

DEBIAN-CVE-2017-7995

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

CVE-2017-7995

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

CVE-2017-7995

Xen PV guest before Xen 4.3 checked access permissions to MMIO ranges only after accessing them, allowing host PCI device space memory reads, leading to information disclosure. This is an error in the getuser function. NOTE: the upstream Xen Project considers versions before 4.5.x to be EOL...

CVE-2017-7995

Concretely, CVE-2017-7995 affects Xen PV guests prior to 4.3: MMIO access permission checks were performed after accessing MMIO ranges, enabling host PCI device space memory reads and leading to information disclosure. The underlying cause is an error in the get_user function. Public symptom and ...

grant transfer allows PV guest to elevate privileges

ISSUE DESCRIPTION The GNTTABOPtransfer operation allows one guest to transfer a page to another guest. The internal processing of this, however, does not include zapping the previous type of the page being transferred. This makes it possible for a PV guest to transfer a page previously used as pa...

x86: 64bit PV guest breakout via pagetable use-after-mode-change

ISSUE DESCRIPTION 64-bit PV guests typically use separate root page tables for their kernel and user modes. Hypercalls are accessible to guest kernel context only, which certain hypercall handlers make assumptions on. The IRET hypercall replacing the identically name CPU instruction is used by...

Xen - Broken Check in memory_exchange() Permits PV Guest Breakout Vulnerability

Exploit for multiple platform in category local exploits Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1184 This bug report describes a vulnerability in memoryexchange that permits PV guest kernels to write to an arbitrary virtual address with hypervisor privileges. The...

util-linux security and bug fix update

2.23.2-33.0.1.el7u3.2 - fix Oracle bug 23001516 - backport lscpu: correct the Virtualization type on Xen DomU PV guest - Reviewed-by: Joe Jin 2.23.2-33.el73.2 fix CVE-2017-2616 - Sending SIGKILL to other processes with root privileges via su 2.23.2-33.el73.1 - fix 1405238 - findmnt --target...

Xen - Broken Check in 'memory_exchange()' Permits PV Guest Breakout

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1184 This bug report describes a vulnerability in memoryexchange that permits PV guest kernels to write to an arbitrary virtual address with hypervisor privileges. The vulnerability was introduced through a broken fix for...

Xen - Broken Check in memory_exchange() Permits PV Guest Breakout

Xen - Broken Check in memoryexchange Permits PV Guest Breakout Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1184 This bug report describes a vulnerability in memoryexchange that permits PV guest kernels to write to an arbitrary virtual address with hypervisor privileges. The...

Fedora 25 : xen (2017-054729ab08)

Qemu: 9pfs: host memory leakage via v9fscreate CVE-2017-7377 1437873 x86: broken check in memoryexchange permits PV guest breakout XSA-212, CVE-2017-7228 1438804 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenabl...

Xen: broken check in memory_exchange() permits PV guest breakout（CVE-2017-7228）

Detailed analysis: Pandavirtualization: Exploiting the Xen hypervisor This bug report describes a vulnerability in memoryexchange that permits PV guest kernels to write to an arbitrary virtual address with the hypervisor privileges. The vulnerability was introduced through a broken fix for...

FreeBSD : xen-kernel -- broken check in memory_exchange() permits PV guest breakout (90becf7c-1acf-11e7-970f-002590263bf5)

The Xen Project reports : The 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 arrays. A malicious or buggy 64-bit PV guest may be able to access all of system memory, allowing f...

x86: broken check in memory_exchange() permits PV guest breakout

ISSUE DESCRIPTION The 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 arrays. IMPACT A malicious or buggy 64-bit PV guest may be able to access all of system memory, allowing fo...