CVE-2013-1917

Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not clear the NT flag when using an IRET after a SYSENTER instruction, which allows PV guest users to cause a denial of service hypervisor crash by triggering a GP fault, which is not properly handled by another IRET instruction...

CVE-2013-1918

Certain page table manipulation operations in Xen 4.1.x, 4.2.x, and earlier are not preemptible, which allows local PV kernels to cause a denial of service via vectors related to "deep page table traversal."...

PT-2013-3468

Name of the Vulnerable Software and Affected Versions Xen versions 4.1.x through 4.2.x Description The issue is related to certain page table manipulation operations in Xen that are not preemptible, allowing local PV kernels to cause a denial of service. This can be achieved through vectors relat...

Xen PV DoS vulnerability with SYSENTER

ISSUE DESCRIPTION The SYSENTER instruction can be used by PV guests to accelerate system call processing. This instruction, however, leaves the EFLAGS register mostly unmodified - in particular, the NT flag doesn't get cleared. If the hypervisor subsequently uses IRET to return to the guest which...

Linux Kernel 本地权限提升漏洞(CVE-2013-0228)

BUGTRAQ ID: 57940 CVECAN ID: CVE-2013-0228 Linux Kernel是Linux操作系统的内核。 Linux kernel内arch/x86/xen/xen-asm32.S的xeniret函数没有正确处理DS段寄存器内的无效值，32-bit PV Xen domain中的guest用户可通过特制的应用利用此漏洞致使guest崩溃甚而提升其权限。 0 Linux kernel 2.6.x 厂商补丁： Linux ----- 目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载： http://www.kernel.org/...

Linux netback DoS via malicious guest ring.

ISSUE DESCRIPTION The Xen netback implementation contains a couple of flaws which can allow a guest to cause a DoS in the backend domain, potentially affecting other domains in the system. CVE-2013-0216 is a failure to sanity check the ring producer/consumer pointers which can allow a guest to...

SuSE 11.1 Security Update : Xen (SAT Patch Number 6653)

Xen was updated to fix several security issues : - A xen HVM guest destroy p2m teardown host DoS vulnerability was fixed, where malicious guest could lock/crash the host. CVE-2012-3433 - A xen HVM guest user mode MMIO emulation DoS was fixed. CVE-2012-3432 - The xen pv bootloader doesn't check th...

Hypervisor crash due to incorrect ASSERT (debug build only)

ISSUE DESCRIPTION A change to an internal interface within the hypervisor invalidated an ASSERT in a caller of that API. This code path is exposed to PV guests via a hypercall allowing administrators of PV guests to crash the hypervisor if it is built with debugging enabled. IMPACT Malicious...

Fedora 16 : xen-4.1.3-6.fc16 (2012-19828)

A guest can cause xen to crash XSA-26, CVE-2012-5510 883082 An HVM guest can cause xen to run slowly or crash XSA-27, CVE-2012-5511 883084 An HVM guest can cause xen to crash or leak information XSA-28, CVE-2012-5512 883085 A PV guest can cause xen to crash and might be able escalate privileges...

CVE-2012-5525

The getpagefromgfn hypercall function in Xen 4.2 allows local PV guest OS administrators to cause a denial of service crash via a crafted GFN that triggers a buffer over-read...

CVE-2012-5525

The getpagefromgfn hypercall function in Xen 4.2 allows local PV guest OS administrators to cause a denial of service crash via a crafted GFN that triggers a buffer over-read...

CVE-2012-5513

The XENMEMexchange handler in Xen 4.2 and earlier does not properly check the memory address, which allows local PV guest OS administrators to cause a denial of service crash or possibly gain privileges via unspecified vectors that overwrite memory in the hypervisor reserved range...

500 Websites defaced by Anonymous Supporters

Hacker Supporting Anonymous Group, with his nickname - "PVE.rr0r" hack 516 websites. Deface page shows a very cool animated Anonymous logo with text "We unite as one but no one can divide us. Expect us!" Because hacker intention was not to harm the website, so he has not change or delete any file...

CVE-2012-2934

Xen 4.0, and 4.1, when running a 64-bit PV guest on "older" AMD CPUs, does not properly protect against a certain AMD processor bug, which allows local guest OS users to cause a denial of service host hang via sequential execution of instructions across a non-canonical boundary, a different...

CVE-2012-0218

Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service guest crash by later...

several hypercalls do not validate input GFNs

ISSUE DESCRIPTION The function getpagefromgfn does not validate its input GFN. An invalid GFN passed to a hypercall which uses this function will cause the hypervisor to read off the end of the frame table and potentially crash. IMPACT A malicious guest administrator of a PV guest can cause Xen t...

XENMEM_exchange may overwrite hypervisor memory

ISSUE DESCRIPTION The handler for XENMEMexchange accesses guest memory without range checking the guest provided addresses, thus allowing these accesses to include the hypervisor reserved range. IMPACT A malicious guest administrator can cause Xen to crash. If the out of address space bounds acce...

CVE-2012-0218: Undefined Security Weakness

Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service guest crash by later...

PT-2012-2409

Name of the Vulnerable Software and Affected Versions Xen versions 3.4 through 4.1 Description The issue allows local PV guest OS users to cause a denial of service by triggering an exception that would normally be handled within Xen, due to a failure to properly clear a flag for exception...

Fedora 17 : xen-4.1.3-6.fc17 (2012-18242)

A guest can block a cpu by setting a bad VCPU deadline XSA 20, CVE-2012-4535 876198 HVM guest can use invalid pirq values to crash xen XSA 21, CVE-2012-4536 876200 HVM guest can exhaust p2m table crashing xen XSA 22, CVE-2012-4537 876203 PAE HVM guest can crash hypervisor XSA-23, CVE-2012-4538...