CVE-2020-29569

CVE-2020-29569 describes a use-after-free in the Linux kernel PV block backend (blkback) when Xen is used, where the kernel thread handler may not reset ring->xenblkd to NULL if the frontend toggles between connect/disconnect, allowing a misbehaving guest to trigger a dom0 crash. The issue aff...

Use after free triggered by block frontend in Linux blkback

ISSUE DESCRIPTION The Linux kernel PV block backend expects the kernel thread handler to reset ring-xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggle between the states connect and disconnect. As a consequence, the block backend may re-use ...

CVE-2019-19869

CVE-2019-19869 affects B&R Industrial Automation APROL (before R4.2 V7.08). The issue allows PVs to be changed via the IosHttp service and JSON interface in unencrypted form, impacting data integrity. No explicit exploit details or in-wild exploitation are provided in the documents. Remediation/v...

Moderate: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the...

CVE-2020-27674

An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique...

x86 PV guest INVLPG-like flushes may leave stale TLB entries

ISSUE DESCRIPTION x86 PV guest kernels may use hypercalls with INVLPG-like behavior to invalidate TLB entries even after changes to non-leaf page tables. Such changes to non-leaf page tables will, however, also render stale possible TLB entries created by Xen's internal use of linear page tables ...

Fedora 33 : xen (2020-306b84fd07)

x86 pv: Crash when handling guest access to MSRMISCENABLE XSA-333, CVE-2020-25602 1881619 Missing unlock in XENMEMacquireresource error path XSA-334, CVE-2020-25598 1881616 race when migrating timers between x86 HVM vCPU-s XSA-336, CVE-2020-25604 1881618 PCI passthrough code reading back hardware...

Fedora 31 : xen (2020-d46fe34349)

x86 pv: Crash when handling guest access to MSRMISCENABLE XSA-333, CVE-2020-25602 1881619 Missing unlock in XENMEMacquireresource error path XSA-334, CVE-2020-25598 1881616 race when migrating timers between x86 HVM vCPU-s XSA-336, CVE-2020-25604 1881618 PCI passthrough code reading back hardware...

CVE-2020-25602

An issue was discovered in Xen through 4.14.x. An x86 PV guest can trigger a host OS crash when handling guest access to MSRMISCENABLE. When a guest accesses certain Model Specific Registers, Xen first reads the value from hardware to use as the basis for auditing the guest access. For the...

CVE-2020-25602

An issue was discovered in Xen through 4.14.x. An x86 PV guest can trigger a host OS crash when handling guest access to MSRMISCENABLE. When a guest accesses certain Model Specific Registers, Xen first reads the value from hardware to use as the basis for auditing the guest access. For the...

CVE-2020-25596

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a GP fault, and incorrectly delivers it twice to the guest...

CVE-2020-25602

CVE-2020-25602 : Xen up to 4.14.x contains a vulnerability where an x86 PV guest accessing the MISC_ENABLE MSR (0x1a0) triggers a host crash due to missing #GP fault handling when reading this Intel-specific MSR. The vulnerability can crash the host Xen instance, enabling a local Denial of Servic...

CVE-2020-25599

An issue was discovered in Xen through 4.14.x. There are evtchnreset race conditions. Uses of EVTCHNOPreset potentially by a guest on itself or XENDOMCTLsoftreset by itself covered by XSA-77 can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses ...

x86 pv guest kernel DoS via SYSENTER

ISSUE DESCRIPTION The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege GP fault typically fatal rather than ...

races with evtchn_reset()

ISSUE DESCRIPTION Uses of EVTCHNOPreset potentially by a guest on itself or XENDOMCTLsoftreset by itself covered by XSA-77 can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. IMPACT In particular x86 PV guests may ...

x86 pv: Crash when handling guest access to MSR_MISC_ENABLE

ISSUE DESCRIPTION When a guest accesses certain Model Specific Registers, Xen first reads the value from hardware to use as the basis for auditing the guest access. For the MISCENABLE MSR, which is an Intel specific MSR, this MSR read is performed without error handling for a GP fault, which is t...

pv-frankonia.de Cross Site Scripting vulnerability OBB-1328810

Following coordinated and responsible vulnerability disclosure guidelines of the ISO 29147 standard, Open Bug Bounty has: &nbsp&nbsp&nbsp&nbsp&nbsp&nbspa. verified the vulnerability and confirmed its existence; &nbsp&nbsp&nbsp&nbsp&nbsp&nbspb. notified the website operator about its existence...

CVE-2020-15852

A flaw was found in the Linux kernel, in the way IOPL and IOPERM system calls were handled during context switches in x86 PV guests. This flaw allows a local guest user to escalate their privileges to the guest. The highest threat from this vulnerability is to data confidentiality and integrity a...

Xen Linux kernel privilege control vulnerability

Linux kernel is the kernel used by Linux, an open source operating system released by the Linux Foundation in the U.S. Xen is an open source virtual machine monitor product from the University of Cambridge, UK. The product enables different and incompatible operating systems to run on the same...

comune.battuda.pv.it Cross Site Scripting vulnerability

Open Bug Bounty ID: OBB-1155753 Following coordinated and responsible vulnerability disclosure guidelines of the ISO 29147 standard, Open Bug Bounty has: &nbsp&nbsp&nbsp&nbsp&nbsp&nbspa. verified the vulnerability and confirmed its existence; &nbsp&nbsp&nbsp&nbsp&nbsp&nbspb. notified the website...