SB2013092704 - Gentoo update for Xen
Published: September 27, 2013 Updated: April 24, 2025
Breakdown by Severity
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Description
This security bulletin contains information about 56 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2012-6030)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The do_tmem_op 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 (host crash) and possibly have other unspecified impacts via unspecified vectors related to "broken locking checks" in an "error path." NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
2) Input validation error (CVE-ID: CVE-2012-6031)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The do_tmem_get 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 "bad_copy error path." NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
3) Input validation error (CVE-ID: CVE-2012-6032)
The vulnerability allows local guest OS users to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (memory corruption and host crash) via unspecified vectors.
4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2012-6033)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The do_tmem_control function in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 does not properly check privileges, which allows local guest OS users to access control stack operations via unspecified vectors. NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
5) Input validation error (CVE-ID: CVE-2012-6034)
The vulnerability allows local guest OS users to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (memory corruption and host crash) or execute arbitrary code via unspecified vectors.
6) Input validation error (CVE-ID: CVE-2012-6035)
The vulnerability allows local guest OS users to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (memory corruption and host crash) or execute arbitrary code via unspecified vectors.
7) Input validation error (CVE-ID: CVE-2012-6036)
The vulnerability allows local guest OS users to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (memory corruption and host crash) or possibly execute arbitrary code via unspecified vectors.
8) Resource management error (CVE-ID: CVE-2011-2901)
The vulnerability allows a remote #AU# to perform a denial of service (DoS) attack.
Off-by-one error in the __addr_ok macro in Xen 3.3 and earlier allows local 64 bit PV guest administrators to cause a denial of service (host crash) via unspecified hypercalls that ignore virtual-address bits.
9) Resource management error (CVE-ID: CVE-2011-3262)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
tools/libxc/xc_dom_bzimageloader.c in Xen 3.2, 3.3, 4.0, and 4.1 allows local users to cause a denial of service (management software infinite loop and management domain resource consumption) via unspecified vectors related to "Lack of error checking in the decompression loop."
10) Privilege escalation (CVE-ID: CVE-2012-0217)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to Intel processors sysret to non-canonical address behavior. This is a vulnerability following from a difference of behaviour of sysret in Intel's version of the amd64 architecture, em64t.
System calls may be implemented as using the em64t syscall/sysret instruction pair.
syscall saves the context of the calling unprivileged process before executing a system call in kernel mode; sysret restores it and resumes ordinary operations in user mode.
In the Intel implementation of sysret, if you have invalid information about the "next instruction" address in your saved context, the sysret instruction will trigger a trap in kernel space. However the sysret instruction is executed with the user stack pointer already loaded, so the kernel fault frame is written to the user stack. The kernel is unable to safely recover from this, so must ensure that the trap doesn't happen.
If your invalid "next instruction" address is in kernel space or in user space (and in the latter case, not where your program is) the program will segfault or execute attacker controlled code. If it is in the gap between user space and kernel space, the CPU will reset, except if someone managed to seed the address location with a valid instruction.
Successful exploitation of the vulnerability may allow an attacker to gain root access to the affected system.
11) Input validation error (CVE-ID: CVE-2012-0218)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
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 triggering an exception that would normally be handled within Xen.
12) Input validation error (CVE-ID: CVE-2012-2934)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
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 vulnerability than CVE-2012-0217.
13) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2012-3432)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
The handle_mmio function in arch/x86/hvm/io.c in the MMIO operations emulator for Xen 3.3 and 4.x, when running an HVM guest, does not properly reset certain state information between emulation cycles, which allows local guest OS users to cause a denial of service (guest OS crash) via unspecified operations on MMIO regions.
14) Resource management error (CVE-ID: CVE-2012-3433)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
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.
15) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2012-3494)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.
16) Input validation error (CVE-ID: CVE-2012-3495)
The vulnerability allows a local non-authenticated attacker to #BASIC_IMPACT#.
The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
17) Configuration (CVE-ID: CVE-2012-3496)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
XENMEM_populate_physmap in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when translating paging mode is not used, allows local PV OS guest kernels to cause a denial of service (BUG triggered and host crash) via invalid flags such as MEMF_populate_on_demand.
18) NULL pointer dereference (CVE-ID: CVE-2012-3497)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via a NULL client id.
19) Input validation error (CVE-ID: CVE-2012-3498)
The vulnerability allows a local non-authenticated attacker to #BASIC_IMPACT#.
PHYSDEVOP_map_pirq in Xen 4.1 and 4.2 and Citrix XenServer 6.0.2 and earlier allows local HVM guest OS kernels to cause a denial of service (host crash) and possibly read hypervisor or guest memory via vectors related to a missing range check of map->index.
20) Input validation error (CVE-ID: CVE-2012-3515)
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
Qemu, as used in Xen 4.0, 4.1 and possibly other products, when emulating certain devices with a virtual console backend, allows local OS guest users to gain privileges via a crafted escape VT100 sequence that triggers the overwrite of a "device model's address space."
21) Information disclosure (CVE-ID: CVE-2012-4411)
The vulnerability allows a local #AU# to gain access to sensitive information.
The graphical console in Xen 4.0, 4.1 and 4.2 allows local OS guest administrators to obtain sensitive host resource information via the qemu monitor. NOTE: this might be a duplicate of CVE-2007-0998.
22) Resource management error (CVE-ID: CVE-2012-4535)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
Xen 3.4 through 4.2, and possibly earlier versions, allows local guest OS administrators to cause a denial of service (Xen infinite loop and physical CPU consumption) by setting a VCPU with an "inappropriate deadline."
23) Input validation error (CVE-ID: CVE-2012-4536)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The (1) domain_pirq_to_emuirq and (2) physdev_unmap_pirq 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.
24) Configuration (CVE-ID: CVE-2012-4537)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set_p2m_entry function fails, which allows local HVM guest OS administrators to cause a denial of service (memory consumption and assertion failure), aka "Memory mapping failure DoS vulnerability."
25) Input validation error (CVE-ID: CVE-2012-4538)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
The HVMOP_pagetable_dying hypercall in Xen 4.0, 4.1, and 4.2 does not properly check the pagetable state when running on shadow pagetables, which allows a local HVM guest OS to cause a denial of service (hypervisor crash) via unspecified vectors.
26) Resource management error (CVE-ID: CVE-2012-4539)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
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 GNTTABOP_get_status_frames, aka "Grant table hypercall infinite loop DoS vulnerability."
27) Input validation error (CVE-ID: CVE-2012-5510)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.x, when downgrading the grant table version, does not properly remove the status page from the tracking list when freeing the page, which allows local guest OS administrators to cause a denial of service (hypervisor crash) via unspecified vectors.
28) Stack-based buffer overflow (CVE-ID: CVE-2012-5511)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing a large bitmap image. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
29) Configuration (CVE-ID: CVE-2012-5512)
The vulnerability allows a local #AU# to #BASIC_IMPACT#.
Array index error in the HVMOP_set_mem_access handler in Xen 4.1 allows local HVM guest OS administrators to cause a denial of service (crash) or obtain sensitive information via unspecified vectors.
30) Input validation error (CVE-ID: CVE-2012-5513)
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
The XENMEM_exchange 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.
31) Input validation error (CVE-ID: CVE-2012-5514)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The guest_physmap_mark_populate_on_demand function in Xen 4.2 and earlier does not properly unlock the subject GFNs when checking if they are in use, which allows local guest HVM administrators to cause a denial of service (hang) via unspecified vectors.
32) Input validation error (CVE-ID: CVE-2012-5515)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The (1) XENMEM_decrease_reservation, (2) XENMEM_populate_physmap, and (3) XENMEM_exchange hypercalls in Xen 4.2 and earlier allow local guest administrators to cause a denial of service (long loop and hang) via a crafted extent_order value.
33) Input validation error (CVE-ID: CVE-2012-5525)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The get_page_from_gfn 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.
34) Configuration (CVE-ID: CVE-2012-5634)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.2.x, 4.1.x, and 4.0, when using Intel VT-d for PCI passthrough, does not properly configure VT-d when supporting a device that is behind a legacy PCI Bridge, which allows local guests to cause a denial of service to other guests by injecting an interrupt.
35) Buffer overflow (CVE-ID: CVE-2012-6075)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Buffer overflow in the e1000_receive function in the e1000 device driver (hw/e1000.c) in QEMU 1.3.0-rc2 and other versions, when the SBP and LPE flags are disabled, allows remote attackers to cause a denial of service (guest OS crash) and possibly execute arbitrary guest code via a large packet.
36) Resource management error (CVE-ID: CVE-2012-6333)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Multiple HVM control operations in Xen 3.4 through 4.2 allow local HVM guest OS administrators to cause a denial of service (physical CPU consumption) via a large input.
37) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-0151)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The do_hvm_op function in xen/arch/x86/hvm/hvm.c in Xen 4.2.x on the x86_32 platform does not prevent HVM_PARAM_NESTEDHVM (aka nested virtualization) operations, which allows guest OS users to cause a denial of service (long-duration page mappings and host OS crash) by leveraging administrative access to an HVM guest in a domain with a large number of VCPUs.
38) Memory leak (CVE-ID: CVE-2013-0152)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within Xen 4.2 and unstable allows local HVM guests to cause a denial of service (host memory consumption) by performing nested virtualization in a way that triggers errors that are not properly handled. A remote attacker can perform a denial of service attack.
39) Input validation error (CVE-ID: CVE-2013-0153)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The AMD IOMMU support in Xen 4.2.x, 4.1.x, 3.3, and other versions, when using AMD-Vi for PCI passthrough, uses the same interrupt remapping table for the host and all guests, which allows guests to cause a denial of service by injecting an interrupt into other guests.
40) Input validation error (CVE-ID: CVE-2013-0154)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The get_page_type function in xen/arch/x86/mm.c in Xen 4.2, when debugging is enabled, allows local PV or HVM guest administrators to cause a denial of service (assertion failure and hypervisor crash) via unspecified vectors related to a hypercall.
41) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-0215)
The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.
oxenstored in Xen 4.1.x, Xen 4.2.x, and xen-unstable does not properly consider the state of the Xenstore ring during read operations, which allows guest OS users to cause a denial of service (daemon crash and host-control outage, or memory consumption) or obtain sensitive control-plane data by leveraging guest administrative access.
42) Resource management error (CVE-ID: CVE-2013-1432)
The vulnerability allows a remote #AU# to execute arbitrary code.
Xen 4.1.x and 4.2.x, when the XSA-45 patch is in place, does not properly maintain references on pages stored for deferred cleanup, which allows local PV guest kernels to cause a denial of service (premature page free and hypervisor crash) or possibly gain privileges via unspecified vectors.
43) Input validation error (CVE-ID: CVE-2013-1917)
The vulnerability allows a local non-authenticated attacker to perform service disruption.
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.
44) Buffer overflow (CVE-ID: CVE-2013-1918)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
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."
45) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-1919)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.2.x and 4.1.x does not properly restrict access to IRQs, which allows local stub domain clients to gain access to IRQs and cause a denial of service via vectors related to "passed-through IRQs or PCI devices."
46) Use-after-free (CVE-ID: CVE-2013-1920)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when processing unspecified vectors. A local guest kernels can inject arbitrary events and gain privileges.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
47) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-1922)
The vulnerability allows a local non-authenticated attacker to read and manipulate data.
qemu-nbd in QEMU, as used in Xen 4.2.x, determines the format of a raw disk image based on the header, which allows local guest OS administrators to read arbitrary files on the host by modifying the header to identify a different format, which is used when the guest is restarted, a different vulnerability than CVE-2008-2004.
48) Input validation error (CVE-ID: CVE-2013-1952)
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
Xen 4.x, when using Intel VT-d for a bus mastering capable PCI device, does not properly check the source when accessing a bridge device's interrupt remapping table entries for MSI interrupts, which allows local guest domains to cause a denial of service (interrupt injection) via unspecified vectors.
49) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-1964)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Xen 4.0.x and 4.1.x incorrectly releases a grant reference when releasing a non-v1, non-transitive grant, which allows local guest administrators to cause a denial of service (host crash), obtain sensitive information, or possibly have other impacts via unspecified vectors.
50) Information disclosure (CVE-ID: CVE-2013-2076)
The vulnerability allows a remote #AU# to gain access to sensitive information.
Xen 4.0.x, 4.1.x, and 4.2.x, when running on AMD64 processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one domain to determine portions of the state of floating point instructions of other domains, which can be leveraged to obtain sensitive information such as cryptographic keys, a similar vulnerability to CVE-2006-1056. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels.
51) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-2077)
The vulnerability allows a remote #AU# to perform a denial of service (DoS) attack.
Xen 4.0.x, 4.1.x, and 4.2.x does not properly restrict the contents of a XRSTOR, which allows local PV guest users to cause a denial of service (unhandled exception and hypervisor crash) via unspecified vectors.
52) Input validation error (CVE-ID: CVE-2013-2078)
The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.
Xen 4.0.2 through 4.0.4, 4.1.x, and 4.2.x allows local PV guest users to cause a denial of service (hypervisor crash) via certain bit combinations to the XSETBV instruction.
53) Input validation error (CVE-ID: CVE-2013-2194)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Multiple integer overflows in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel.
54) Input validation error (CVE-ID: CVE-2013-2195)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to "pointer dereferences" involving unexpected calculations.
55) Input validation error (CVE-ID: CVE-2013-2196)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
Multiple unspecified vulnerabilities in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to "other problems" that are not CVE-2013-2194 or CVE-2013-2195.
56) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2013-2211)
The vulnerability allows a remote #AU# to execute arbitrary code.
The libxenlight (libxl) toolstack library in Xen 4.0.x, 4.1.x, and 4.2.x uses weak permissions for xenstore keys for paravirtualised and emulated serial console devices, which allows local guest administrators to modify the xenstore value via unspecified vectors.
Remediation
Install update from vendor's website.