Xen Denial of Service Vulnerability (CNVD-2018-04652)

Xen is an open source virtual machine monitor developed by the Xen Project. A denial of service vulnerability exists in 4.10.x and earlier versions of Xen. x86 PV guest OS users can exploit this vulnerability to cause a denial of service host OS CPU hang via a non-preemptive L3/L4 page table...

DoS via non-preemptable L3/L4 pagetable freeing

ISSUE DESCRIPTION Guests have the ability to request removal of memory from themselves. This operation is intended to be requested for normal read/write pages, but is also permitted to be used on other types of pages. So far this in particular included pages pinned to their current type, with the...

kernel security update

2.6.18-419.0.0.0.8 - Backport CVEs to RHCK/OL5 orabug 27547712 CVE-2017-5753 CVE-2017-5754 - 2.6.18-419.0.0.0.5 - fs fix kernel panic on boot on ia64 guests Honglei Wang orabug 26934100...

kernel security update

kernel 2.6.18-419.0.0.0.5 - fs fix kernel panic on boot on ia64 guests Honglei Wang orabug 26934100 2.6.18-419.0.0.0.4 - fs fix bug in loading of PIE binaries Michael Davidson orabug 26916951 CVE-2017-1000253...

SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2018:0385-1)

This update for libvirt provides several fixes. This security issue was fixed : - CVE-2018-5748: Prevent resource exhaustion via qemuMonitorIORead method which allowed to cause DoS bsc1076500. These security issues were fixed : - Add a qemu hook script providing functionality similar to Xen's...

SUSE-SU-2018:0372-1 security update for spice-vdagent

This update for spice-vdagent provides the following fixes: This security issue was fixed: - CVE-2017-15108: Properly escape save directory that is passed to the shell to prevent local attacker with access to the session the agent runs from injecting arbitrary commands to be executed bsc1070724...

SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2018:0279-1)

This update for libvirt provides several fixes. This security issue was fixed : - CVE-2018-5748: Prevent resource exhaustion via qemuMonitorIORead method which allowed to cause DoS bsc1076500. These security issues were fixed : - Add a qemu hook script providing functionality similar to Xen's...

Fedora 27 : xen (2017-333ea49a63)

xen: various flaws 1490884 Missing NUMA node parameter verification XSA-231, CVE-2017-14316 Missing check for grant table XSA-232, CVE-2017-14318 cxenstored: Race in domain cleanup XSA-233, CVE-2017-14317 insufficient grant unmapping checks for x86 PV guests XSA-234, CVE-2017-14319 Note that...

Fedora 27 : xen (2017-5945560816)

another patch related to the XSA-240, CVE-2017-15595 issue x86 PV guests may gain access to internally used page XSA-248 broken x86 shadow mode refcount overflow check XSA-249 improper x86 shadow mode refcount error handling XSA-250 improper bug check in x86 log-dirty handling XSA-251 Note that...

Beers with Talos EP 19: The "Best" of BWT

Beers with Talos BWT Podcast Episode 19 is now available. Download this episode and subscribe to Beers with Talos: If iTunes and Google Play aren't your thing: www.talosintelligence.com/podcast EP19 Show Notes: Quotes intended, we think you know why. Mitch takes control to present the best of the...

UBUNTU-CVE-2017-17565

An issue was discovered in Xen through 4.9.x allowing PV guest OS users to cause a denial of service host OS crash if shadow mode and log-dirty mode are in place, because of an incorrect assertion related to M2P...

DEBIAN-CVE-2017-17565

An issue was discovered in Xen through 4.9.x allowing PV guest OS users to cause a denial of service host OS crash if shadow mode and log-dirty mode are in place, because of an incorrect assertion related to M2P...

UBUNTU-CVE-2017-17566

An issue was discovered in Xen through 4.9.x allowing PV guest OS users to cause a denial of service host OS crash or gain host OS privileges in shadow mode by mapping a certain auxiliary page...

DEBIAN-CVE-2017-17566

An issue was discovered in Xen through 4.9.x allowing PV guest OS users to cause a denial of service host OS crash or gain host OS privileges in shadow mode by mapping a certain auxiliary page...

ALPINE-CVE-2017-17566

An issue was discovered in Xen through 4.9.x allowing PV guest OS users to cause a denial of service host OS crash or gain host OS privileges in shadow mode by mapping a certain auxiliary page...

improper x86 shadow mode refcount error handling

ISSUE DESCRIPTION Pages being used to run x86 guests in shadow mode are reference counted to track their uses. When another reference cannot be acquired, the corresponding page table entry must not be inserted. Due to incorrect error handling, this constraint could be violated. IMPACT A malicious...

improper bug check in x86 log-dirty handling

ISSUE DESCRIPTION Memory sharing, available to x86 HVM guests only, uses a special value in the global machine to physical address translation table M2P. PV guests have full control over M2P entries corresponding to pages they own. A bug check specifically, an assertion that an M2P entry is not t...

x86 PV guests may gain access to internally used pages

ISSUE DESCRIPTION Memory management for PV guests builds on page ownership and page attributes. A domain can always map, at least r/o, pages of which it is the owner. Certain fields in the control structure of a page are used for different purposes in the main PV memory management code and in cod...

Xen Hypervisor Guest-to-Host Privilege Escalation (XSA-247)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a guest-to-host privilege escalation vulnerability. This issue only affects HVM guests. Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not...

ALPINE-CVE-2017-17044

An issue was discovered in Xen through 4.9.x allowing HVM guest OS users to cause a denial of service infinite loop and host OS hang by leveraging the mishandling of Populate on Demand PoD errors...