The acceleration support for the "REP MOVS" instruction in Xen 4.4.x, 3.2.x, and earlier lacks properly bounds checking for memory mapped I/O (MMIO) emulated in the hypervisor, which allows local HVM guests to cause a denial of service (host crash) via unspecified vectors.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2020-0039 for details.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2018-0248 for details.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2015-0142 for details.

xen was updated to fix 10 security issues :

  - Guest effectable page reference leak in     MMU_MACHPHYS_UPDATE handling (CVE-2014-9030).

  - Insufficient bounding of 'REP MOVS' to MMIO emulated     inside the hypervisor (CVE-2014-8867).

  - Missing privilege level checks in x86 emulation of far     branches (CVE-2014-8595).

  - Missing privilege level checks in x86 HLT, LGDT, LIDT,     and LMSW emulation (CVE-2014-7155).

  - Hypervisor heap contents leaked to guests     (CVE-2014-4021).

  - Missing privilege level checks in x86 emulation of far     branches (CVE-2014-8595).

  - Insufficient restrictions on certain MMU update     hypercalls (CVE-2014-8594).

  - Intel VT-d Interrupt Remapping engines can be evaded by     native NMI interrupts (CVE-2013-3495).

  - Missing privilege level checks in x86 emulation of     software interrupts (CVE-2014-7156).

  - Race condition in HVMOP_track_dirty_vram     (CVE-2014-7154).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

xen was updated to fix 14 security issues :

  - Guest effectable page reference leak in     MMU_MACHPHYS_UPDATE handling (CVE-2014-9030).

  - Insufficient bounding of 'REP MOVS' to MMIO emulated     inside the hypervisor (CVE-2014-8867).

  - Missing privilege level checks in x86 HLT, LGDT, LIDT,     and LMSW emulation (CVE-2014-7155).

  - Hypervisor heap contents leaked to guests     (CVE-2014-4021).

  - Missing privilege level checks in x86 emulation of far     branches (CVE-2014-8595).

  - Insufficient restrictions on certain MMU update     hypercalls (CVE-2014-8594).

  - Intel VT-d Interrupt Remapping engines can be evaded by     native NMI interrupts (CVE-2013-3495).

  - Missing privilege level checks in x86 emulation of     software interrupts (CVE-2014-7156).

  - Race condition in HVMOP_track_dirty_vram     (CVE-2014-7154).

  - Improper MSR range used for x2APIC emulation     (CVE-2014-7188).

  - HVMOP_set_mem_type allows invalid P2M entries to be     created (CVE-2014-3124).

  - HVMOP_set_mem_access is not preemptible (CVE-2014-2599).

  - Excessive checking in compatibility mode hypercall     argument translation (CVE-2014-8866).

  - Guest user mode triggerable VM exits not handled by     hypervisor (bnc#903850).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Xen has been updated to fix six security issues :

  - Guest effectable page reference leak in     MMU_MACHPHYS_UPDATE handling (CVE-2014-9030).

  - Insufficient bounding of 'REP MOVS' to MMIO emulated     inside the hypervisor (CVE-2014-8867).

  - Missing privilege level checks in x86 emulation of far     branches (CVE-2014-8595).

  - Guest user mode triggerable VM exits not handled by     hypervisor (bnc#903850).

  - Missing privilege level checks in x86 HLT, LGDT, LIDT,     and LMSW emulation (CVE-2014-7155).

  - Hypervisor heap contents leaked to guests     (CVE-2014-4021).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201504-04 (Xen: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen.  Please review the       CVE identifiers referenced below for details.
  Impact :

    A local attacker could possibly cause a Denial of Service condition or       obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

From Red Hat Security Advisory 2015:0783 :

Updated kernel packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

* It was found that the Linux kernel's Infiniband subsystem did not properly sanitize input parameters while registering memory regions from user space via the (u)verbs API. A local user with access to a /dev/infiniband/uverbsX device could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2014-8159, Important)

* An insufficient bound checking flaw was found in the Xen hypervisor's implementation of acceleration support for the 'REP MOVS' instructions. A privileged HVM guest user could potentially use this flaw to crash the host. (CVE-2014-8867, Important)

Red Hat would like to thank Mellanox for reporting CVE-2014-8159, and the Xen project for reporting CVE-2014-8867.

This update also fixes the following bugs :

* Under memory pressure, cached data was previously flushed to the backing server using the PID of the thread responsible for flushing the data in the Server Message Block (SMB) headers instead of the PID of the thread which actually wrote the data. As a consequence, when a file was locked by the writing thread prior to writing, the server considered writes by the thread flushing the pagecache as being a separate process from writing to a locked file, and thus rejected the writes. In addition, the data to be written was discarded. This update ensures that the correct PID is sent to the server, and data corruption is avoided when data is being written from a client under memory pressure. (BZ#1169304)

* This update adds support for new cryptographic hardware in toleration mode for IBM System z. (BZ#1182522)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

- It was found that the Linux kernel's Infiniband     subsystem did not properly sanitize input parameters     while registering memory regions from user space via the     (u)verbs API. A local user with access to a     /dev/infiniband/uverbsX device could use this flaw to     crash the system or, potentially, escalate their     privileges on the system. (CVE-2014-8159, Important)

  - An insufficient bound checking flaw was found in the Xen     hypervisor's implementation of acceleration support for     the 'REP MOVS' instructions. A privileged HVM guest user     could potentially use this flaw to crash the host.
    (CVE-2014-8867, Important)

This update also fixes the following bugs :

  - Under memory pressure, cached data was previously     flushed to the backing server using the PID of the     thread responsible for flushing the data in the Server     Message Block (SMB) headers instead of the PID of the     thread which actually wrote the data. As a consequence,     when a file was locked by the writing thread prior to     writing, the server considered writes by the thread     flushing the pagecache as being a separate process from     writing to a locked file, and thus rejected the writes.
    In addition, the data to be written was discarded. This     update ensures that the correct PID is sent to the     server, and data corruption is avoided when data is     being written from a client under memory pressure.

The system must be rebooted for this update to take effect.

Updated kernel packages that fix two security issues and two bugs are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

* It was found that the Linux kernel's Infiniband subsystem did not properly sanitize input parameters while registering memory regions from user space via the (u)verbs API. A local user with access to a /dev/infiniband/uverbsX device could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2014-8159, Important)

* An insufficient bound checking flaw was found in the Xen hypervisor's implementation of acceleration support for the 'REP MOVS' instructions. A privileged HVM guest user could potentially use this flaw to crash the host. (CVE-2014-8867, Important)

Red Hat would like to thank Mellanox for reporting CVE-2014-8159, and the Xen project for reporting CVE-2014-8867.

This update also fixes the following bugs :

* Under memory pressure, cached data was previously flushed to the backing server using the PID of the thread responsible for flushing the data in the Server Message Block (SMB) headers instead of the PID of the thread which actually wrote the data. As a consequence, when a file was locked by the writing thread prior to writing, the server considered writes by the thread flushing the pagecache as being a separate process from writing to a locked file, and thus rejected the writes. In addition, the data to be written was discarded. This update ensures that the correct PID is sent to the server, and data corruption is avoided when data is being written from a client under memory pressure. (BZ#1169304)

* This update adds support for new cryptographic hardware in toleration mode for IBM System z. (BZ#1182522)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

The XEN virtualization was updated to fix bugs and security issues :

Security issues fixed: CVE-2015-0361: XSA-116: xen: xen crash due to use after free on hvm guest teardown 

CVE-2014-9065, CVE-2014-9066: XSA-114: xen: p2m lock starvation

CVE-2014-9030: XSA-113: Guest effectable page reference leak in MMU_MACHPHYS_UPDATE handling

CVE-2014-8867: XSA-112: xen: Insufficient bounding of 'REP MOVS' to MMIO emulated inside the hypervisor

CVE-2014-8866: XSA-111: xen: Excessive checking in compatibility mode hypercall argument translation

CVE-2014-8595: XSA-110: xen: Missing privilege level checks in x86 emulation of far branches

CVE-2014-8594: XSA-109: xen: Insufficient restrictions on certain MMU update hypercalls

CVE-2013-3495: XSA-59: xen: Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts

CVE-2014-5146, CVE-2014-5149: xen: XSA-97 Long latency virtual-mmu operations are not preemptible

Bugs fixed :

  - Restore missing fixes from block-dmmd script

  - bnc#904255 - XEN boot hangs in early boot on UEFI system

  - Fix missing banner by restoring figlet program

  - bnc#903357 - Corrupted save/restore test leaves orphaned     data in xenstore

  - bnc#903359 - Temporary migration name is not cleaned up     after migration

  - bnc#903850 - Xen: guest user mode triggerable VM exits     not handled by hypervisor

  - bnc#866902 - Xen save/restore of HVM guests cuts off     disk and networking 

  - bnc#901317 - increase limit domUloader to 32MB

  - bnc#898772 - SLES 12 RC3 - XEN Host crashes when     assigning non-VF device (SR-IOV) to guest

  - bnc#882089 - Windows 2012 R2 fails to boot up with     greater than 60 vcpus

  - bsc#900292 - xl: change default dump directory

  - Update xen2libvirt.py to better detect and handle file     formats

  - bnc#882089 - Windows 2012 R2 fails to boot up with     greater than 60 vcpus

  - bnc#897906 - libxc: check return values on mmap() and     madvise() on xc_alloc_hypercall_buffer()

  - bnc#896023 - Adjust xentop column layout

The virtualization software XEN was updated to version 4.3.3 and also to fix bugs and security issues.

Security issues fixed: CVE-2015-0361: XSA-116: xen: xen crash due to use after free on hvm guest teardown 

CVE-2014-9065, CVE-2014-9066: XSA-114: xen: p2m lock starvation

CVE-2014-9030: XSA-113: Guest effectable page reference leak in MMU_MACHPHYS_UPDATE handling

CVE-2014-8867: XSA-112: xen: Insufficient bounding of 'REP MOVS' to MMIO emulated inside the hypervisor

CVE-2014-8866: XSA-111: xen: Excessive checking in compatibility mode hypercall argument translation

CVE-2014-8595: XSA-110: xen: Missing privilege level checks in x86 emulation of far branches

CVE-2014-8594: XSA-109: xen: Insufficient restrictions on certain MMU update hypercalls

CVE-2013-3495: XSA-59: xen: Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts

CVE-2014-5146, CVE-2014-5149: xen: XSA-97 Long latency virtual-mmu operations are not preemptible

Bugs fixed :

  - bnc#903357 - Corrupted save/restore test leaves orphaned     data in xenstore

  - bnc#903359 - Temporary migration name is not cleaned up     after migration

  - bnc#903850 - VUL-0: Xen: guest user mode triggerable VM     exits not handled by hypervisor

  - bnc#866902 - L3: Xen save/restore of HVM guests cuts off     disk and networking

  - bnc#901317 - L3: increase limit domUloader to 32MB     domUloader.py

  - bnc#882089 - Windows 2012 R2 fails to boot up with     greater than 60 vcpus

  - bsc#900292 - xl: change default dump directory

  - Update to Xen 4.3.3

Multiple security issues have been discovered in the Xen virtualisation solution which may result in denial of service, information disclosure or privilege escalation.

  - CVE-2014-8594     Roger Pau Monne and Jan Beulich discovered that     incomplete restrictions on MMU update hypercalls may     result in privilege escalation.

  - CVE-2014-8595     Jan Beulich discovered that missing privilege level     checks in the x86 emulation of far branches may result     in privilege escalation.

  - CVE-2014-8866     Jan Beulich discovered that an error in compatibility     mode hypercall argument translation may result in denial     of service.

  - CVE-2014-8867     Jan Beulich discovered that an insufficient restriction     in acceleration support for the 'REP MOVS' instruction     may result in denial of service.

  - CVE-2014-9030     Andrew Cooper discovered a page reference leak in     MMU_MACHPHYS_UPDATE handling, resulting in denial of     service.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2015-0004 for details.

Xen has been updated to version 4.2.5 with additional patches to fix six security issues :

  - Guest effectable page reference leak in     MMU_MACHPHYS_UPDATE handling. (CVE-2014-9030)

  - Insufficient bounding of 'REP MOVS' to MMIO emulated     inside the hypervisor. (CVE-2014-8867)

  - Excessive checking in compatibility mode hypercall     argument translation. (CVE-2014-8866)

  - Guest user mode triggerable VM exits not handled by     hypervisor. (bnc#903850)

  - Missing privilege level checks in x86 emulation of far     branches. (CVE-2014-8595)

  - Insufficient restrictions on certain MMU update     hypercalls (CVE-2014-8594). These non-security issues     have been fixed :

  - Xen save/restore of HVM guests cuts off disk and     networking. (bnc#866902)

  - Windows 2012 R2 fails to boot up with greater than 60     vcpus. (bnc#882089)

  - Increase limit domUloader to 32MB. (bnc#901317)

  - Adjust xentop column layout. (bnc#896023)

The remote host is running a version of Citrix XenServer that is affected by multiple vulnerabilities :

  - A local privilege escalation vulnerability exists     due to improperly restricted access to     'PHYSDEVOP_{prepare,release}_msix' operations by     unprivileged guests. An attacker with access to a guest     operating system can exploit this issue to gain elevated     privileges on affected computers. (CVE-2014-1666)

  - A local privilege escalation vulnerability exists     due to missing privilege level checks in x86 emulation     of far branches. This flaw exists in the CALL, JMP, and     RETF instructions in the Intel assembly syntax, and the     LCALL, LJMP, and LRET instructions in the AT&T syntax.
    An attacker with access to a guest operating system can     exploit this issue to gain elevated privileges on     affected computers. (CVE-2014-8595)

  - A denial of service vulnerability exists due to a     failure to restrict access to the hypercall argument     translation feature. An attacker with access to a guest     operating system can crash the host with excessive     checks on the final register state for 32-bit guests     running on a 64-bit hypervisor. (CVE-2014-8866)

  - A denial of service vulnerability exists due to     insufficient bounding of 'REP MOVS' to MMIO emulated     inside of the hypervisor. This flaw affects the     'hvm_mmio_intercept()' function in 'intercept.c'. An     attacker with access to a guest operating system can     exploit this issue to crash the host.
    (CVE-2014-8867)

ID	Name	Product	Family	Severity
140019	OracleVM 3.4 : xen (OVMSA-2020-0039) (Bunker Buster) (Foreshadow) (MDSUM/RIDL) (MFBDS/RIDL/ZombieLoad) (MLPDS/RIDL) (MSBDS/Fallout) (Meltdown) (POODLE) (Spectre)	Nessus	OracleVM Local Security Checks	critical
111992	OracleVM 3.4 : xen (OVMSA-2018-0248) (Bunker Buster) (Foreshadow) (Meltdown) (POODLE) (Spectre)	Nessus	OracleVM Local Security Checks	critical
86670	OracleVM 3.2 : xen (OVMSA-2015-0142)	Nessus	OracleVM Local Security Checks	high
83659	SUSE SLES11 Security Update : xen (SUSE-SU-2014:1732-1)	Nessus	SuSE Local Security Checks	high
83654	SUSE SLES11 Security Update : xen (SUSE-SU-2014:1710-1)	Nessus	SuSE Local Security Checks	high
83651	SUSE SLES10 Security Update : Xen (SUSE-SU-2014:1691-1)	Nessus	SuSE Local Security Checks	high
82734	GLSA-201504-04 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
82688	Oracle Linux 5 : kernel (ELSA-2015-0783)	Nessus	Oracle Linux Local Security Checks	medium
82638	Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20150407)	Nessus	Scientific Linux Local Security Checks	medium
82637	RHEL 5 : kernel (RHSA-2015:0783)	Nessus	Red Hat Local Security Checks	medium
82621	CentOS 5 : kernel (CESA-2015:0783)	Nessus	CentOS Local Security Checks	medium
81305	openSUSE Security Update : xen (openSUSE-2015-129)	Nessus	SuSE Local Security Checks	high
81239	openSUSE Security Update : xen (openSUSE-2015-113)	Nessus	SuSE Local Security Checks	high
81027	Debian DSA-3140-1 : xen - security update	Nessus	Debian Local Security Checks	high
80928	OracleVM 3.3 : xen (OVMSA-2015-0004)	Nessus	OracleVM Local Security Checks	medium
80254	SuSE 11.3 Security Update : Xen (SAT Patch Number 10018)	Nessus	SuSE Local Security Checks	high
79745	Citrix XenServer Multiple Vulnerabilities (CTX200288)	Nessus	Misc.	critical

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CVE-2014-8867

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