kernel: xen: Several memory hypercall operations allow invalid extent order values

The 1 XENMEMdecreasereservation, 2 XENMEMpopulatephysmap, and 3 XENMEMexchange hypercalls in Xen 4.2 and earlier allow local guest administrators to cause a denial of service long loop and hang via a crafted extentorder value...

Nested HVM exposes host to being driven out of memory by guest

ISSUE DESCRIPTION Guests are currently permitted to enable nested virtualization on themselves. Missing error handling cleanup in the handling code makes it possible for a guest, particularly a multi-vCPU one, to repeatedly invoke this operation, thus causing a leak of - over time - unbounded...

nested virtualization on 32-bit exposes host crash

ISSUE DESCRIPTION When performing nested virtualisation Xen would incorrectly map guest pages for extended periods using an interface which is only intended for transient mappings. In some configurations there are a limited number of slots available for these transient mappings and exhausting the...

Linux stack corruption in xen_failsafe_callback for 32bit PVOPS guests.

ISSUE DESCRIPTION xenfailsafecallback incorrectly sets up its stack if an iret fault is injected by the hypervisor. IMPACT Malicious or buggy unprivileged userspace can cause the guest kernel to crash, or operate erroneously. VULNERABLE SYSTEMS All 32bit PVOPS versions of Linux are affected, sinc...

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...

DEBIAN-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...

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...

Broken error handling in guest_physmap_mark_populate_on_demand()

ISSUE DESCRIPTION guestphysmapmarkpopulateondemand, before carrying out its actual operation, checks that the subject GFNs are not in use. If that check fails, the code prints a message and bypasses the gfnunlock matching the gfnlock carried out before entering the loop. Further, the function is...

HVMOP_get_mem_access crash / HVMOP_set_mem_access information leak

ISSUE DESCRIPTION The HVMOPsetmemaccess operation handler uses an input as an array index before range checking it. IMPACT A malicious guest administrator can cause Xen to crash. If the out of array bounds access does not crash, the arbitrary value read will be used if the caller reads back the...

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...

DEBIAN-CVE-2012-3433

Xen 4.0 and 4.1 allows local HVM guest OS kernels to cause a denial of service domain 0 VCPU hang and kernel panic by modifying the physical address space in a way that triggers excessive shared page search time during the p2m teardown...

DEBIAN-CVE-2012-6031

The dotmemget function in the Transcendent Memory TMEM in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service CPU hang and host crash via unspecified vectors related to a spinlock being held in the "badcopy error path." NOTE: this issue was originally published as part o...

DEBIAN-CVE-2012-4536

The 1 domainpirqtoemuirq and 2 physdevunmappirq functions in Xen 2.2 allows local guest OS administrators to cause a denial of service Xen crash via a crafted pirq value that triggers an out-of-bounds read...

CVE-2012-4539

Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service infinite loop and hang or crash via invalid arguments to GNTTABOPgetstatusframes, aka "Grant table hypercall infinite loop DoS vulnerability."...

DEBIAN-CVE-2012-4539

Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service infinite loop and hang or crash via invalid arguments to GNTTABOPgetstatusframes, aka "Grant table hypercall infinite loop DoS vulnerability."...

Design/Logic Flaw

Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service infinite loop and hang or crash via invalid arguments to GNTTABOPgetstatusframes, aka "Grant table hypercall infinite loop DoS vulnerability."...

CVE-2012-4539

Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service infinite loop and hang or crash via invalid arguments to GNTTABOPgetstatusframes, aka "Grant table hypercall infinite loop DoS vulnerability."...

CVE-2012-4539: Undefined Security Weakness

Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service infinite loop and hang or crash via invalid arguments to GNTTABOPgetstatusframes, aka "Grant table hypercall infinite loop DoS vulnerability."...

SuSE 10 Security Update : Xen (ZYPP Patch Number 8359)

XEN received various security and bugfixes : - xen: Timer overflow DoS vulnerability XSA-20. CVE-2012-4535 - xen: Memory mapping failure DoS vulnerability XSA-22 The following additional bugs have beenfixed:. CVE-2012-4537 - L3: Xen BUG at ioapic.c:129 26102-x86-IOAPIC-legacy-not-first.patch...

pirq range check DoS vulnerability

ISSUE DESCRIPTION domainpirqtoemuirq uses the guest provided pirq value before range checking it, and physdevunmappirq uses domainpirqtoemuirq without checking the pirq value either. Invalid pirq values can cause Xen to read out of array bounds, usually resulting in a fatal page fault. IMPACT A...