Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.3 Extended Update Support.

The Red Hat Security Response Team 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.

This update fixes the following security issues :

* A flaw was found in the way the vhost kernel module handled descriptors that spanned multiple regions. A privileged guest user in a KVM (Kernel-based Virtual Machine) guest could use this flaw to crash the host or, potentially, escalate their privileges on the host.
(CVE-2013-0311, Important)

* A buffer overflow flaw was found in the way UTF-8 characters were converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's FAT file system implementation. A local user able to mount a FAT file system with the 'utf8=1' option could use this flaw to crash the system or, potentially, to escalate their privileges.
(CVE-2013-1773, Important)

* A flaw was found in the way KVM handled guest time updates when the buffer the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) crossed a page boundary. A privileged guest user could use this flaw to crash the host or, potentially, escalate their privileges, allowing them to execute arbitrary code at the host kernel level. (CVE-2013-1796, Important)

* A potential use-after-free flaw was found in the way KVM handled guest time updates when the GPA (guest physical address) the guest registered by writing to the MSR_KVM_SYSTEM_TIME machine state register (MSR) fell into a movable or removable memory region of the hosting user-space process (by default, QEMU-KVM) on the host. If that memory region is deregistered from KVM using KVM_SET_USER_MEMORY_REGION and the allocated virtual memory reused, a privileged guest user could potentially use this flaw to escalate their privileges on the host. (CVE-2013-1797, Important)

* A flaw was found in the way KVM emulated IOAPIC (I/O Advanced Programmable Interrupt Controller). A missing validation check in the ioapic_read_indirect() function could allow a privileged guest user to crash the host, or read a substantial portion of host kernel memory.
(CVE-2013-1798, Important)

* It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A use-after-free flaw was found in the tmpfs implementation. A local user able to mount and unmount a tmpfs file system could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2013-1767, Low)

* A format string flaw was found in the ext3_msg() function in the Linux kernel's ext3 file system implementation. A local user who is able to mount an ext3 file system could use this flaw to cause a denial of service or, potentially, escalate their privileges.
(CVE-2013-1848, Low)

Red Hat would like to thank Andrew Honig of Google for reporting the CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798 issues. The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes several bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section.

Users should 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 remote Oracle Linux 5 / 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2013-2523 advisory.

  - block/scsi_ioctl.c in the Linux kernel through 3.8 does not properly consider the SCSI device class during     authorization of SCSI commands, which allows local users to bypass intended access restrictions via an     SG_IO ioctl call that leverages overlapping opcodes. (CVE-2012-4542)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Updated kernel packages that fix multiple security issues, address several hundred bugs, and add numerous enhancements are now available as part of the ongoing support and maintenance of Red Hat Enterprise Linux version 6. This is the fourth regular update.

The Red Hat Security Response Team 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.

This update fixes the following security issues :

* A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. (CVE-2012-4508, Important)

* A flaw was found in the way the vhost kernel module handled descriptors that spanned multiple regions. A privileged guest user in a KVM guest could use this flaw to crash the host or, potentially, escalate their privileges on the host. (CVE-2013-0311, Important)

* It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A flaw was found in the way the xen_failsafe_callback() function in the Linux kernel handled the failed iret (interrupt return) instruction notification from the Xen hypervisor. An unprivileged user in a 32-bit para-virtualized guest could use this flaw to crash the guest. (CVE-2013-0190, Moderate)

* A flaw was found in the way pmd_present() interacted with PROT_NONE memory ranges when transparent hugepages were in use. A local, unprivileged user could use this flaw to crash the system.
(CVE-2013-0309, Moderate)

* A flaw was found in the way CIPSO (Common IP Security Option) IP options were validated when set from user mode. A local user able to set CIPSO IP options on the socket could use this flaw to crash the system. (CVE-2013-0310, Moderate)

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508, and Andrew Cooper of Citrix for reporting CVE-2013-0190. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes several hundred bugs and adds enhancements.
Refer to the Red Hat Enterprise Linux 6.4 Release Notes for information on the most significant of these changes, and the Technical Notes for further information, both linked to in the References.

All Red Hat Enterprise Linux 6 users are advised to install these updated packages, which correct these issues, and fix the bugs and add the enhancements noted in the Red Hat Enterprise Linux 6.4 Release Notes and Technical Notes. The system must be rebooted for this update to take effect.

Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.2 Extended Update Support.

The Red Hat Security Response Team 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.

This update fixes the following security issues :

* A flaw was found in the way the vhost kernel module handled descriptors that spanned multiple regions. A privileged guest user in a KVM (Kernel-based Virtual Machine) guest could use this flaw to crash the host or, potentially, escalate their privileges on the host.
(CVE-2013-0311, Important)

* A flaw was found in the way the KVM subsystem handled guests attempting to run with the X86_CR4_OSXSAVE CPU feature flag set. On hosts without the XSAVE CPU feature, a local, unprivileged user could use this flaw to crash the host system. (The 'grep --color xsave /proc/cpuinfo' command can be used to verify if your system has the XSAVE CPU feature.) (CVE-2012-4461, Moderate)

* It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A use-after-free flaw was found in the tmpfs implementation. A local user able to mount and unmount a tmpfs file system could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2013-1767, Low)

Red Hat would like to thank Jon Howell for reporting CVE-2012-4461.
CVE-2012-4542 was discovered by Paolo Bonzini of Red Hat.

This update also fixes the following bugs :

* Previously, when open(2) system calls were processed, the GETATTR routine did not check to see if valid attributes were also returned.
As a result, the open() call succeeded with invalid attributes instead of failing in such a case. This update adds the missing check, and the open() call succeeds only when valid attributes are returned.
(BZ#960409)

* Previously, the fsync(2) system call incorrectly returned the EIO (Input/Output) error instead of the ENOSPC (No space left on device) error. This was due to incorrect error handling in the page cache.
This problem has been fixed and the correct error value is now returned. (BZ#960418)

* In the RPC code, when a network socket backed up due to high network traffic, a timer was set causing a retransmission, which in turn could cause an even larger amount of network traffic to be generated. To prevent this problem, the RPC code now waits for the socket to empty instead of setting the timer. (BZ#960423)

* This update fixes a number of bugs in the be2iscsi driver for ServerEngines BladeEngine 2 Open iSCSI devices. (BZ#955502)

Users should 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 remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-2525 advisory.

  - The llc_ui_getname function in net/llc/af_llc.c in the Linux kernel before 3.6 has an incorrect return     value in certain circumstances, which allows local users to obtain sensitive information from kernel stack     memory via a crafted application that leverages an uninitialized pointer argument. (CVE-2012-6542)

  - Heap-based buffer overflow in the tg3_read_vpd function in drivers/net/ethernet/broadcom/tg3.c in the     Linux kernel before 3.8.6 allows physically proximate attackers to cause a denial of service (system     crash) or possibly execute arbitrary code via crafted firmware that specifies a long string in the Vital     Product Data (VPD) data structure. (CVE-2013-1929)

  - Heap-based buffer overflow in the wdm_in_callback function in drivers/usb/class/cdc-wdm.c in the Linux     kernel before 3.8.4 allows physically proximate attackers to cause a denial of service (system crash) or     possibly execute arbitrary code via a crafted cdc-wdm USB device. (CVE-2013-1860)

  - fs/ext3/super.c in the Linux kernel before 3.8.4 uses incorrect arguments to functions in certain     circumstances related to printk input, which allows local users to conduct format-string attacks and     possibly gain privileges via a crafted application. (CVE-2013-1848)

  - The scm_set_cred function in include/net/scm.h in the Linux kernel before 3.8.11 uses incorrect uid and     gid values during credentials passing, which allows local users to gain privileges via a crafted     application. (CVE-2013-1979)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An updated rhev-hypervisor6 package that fixes three security issues, various bugs, and adds an enhancement is now available.

The Red Hat Security Response Team 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 rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: A subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for the Intel 64 and AMD64 architectures with virtualization extensions.

A flaw was found in the way the vhost kernel module handled descriptors that spanned multiple regions. A privileged guest user could use this flaw to crash the host or, potentially, escalate their privileges on the host. (CVE-2013-0311)

It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542)

It was discovered that dnsmasq, when used in combination with certain libvirtd configurations, could incorrectly process network packets from network interfaces that were intended to be prohibited. A remote, unauthenticated attacker could exploit this flaw to cause a denial of service via DNS amplification attacks. (CVE-2012-3411)

The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This updated package provides updated components that include fixes for several security issues. These issues had no security impact on Red Hat Enterprise Virtualization Hypervisor itself, however. The security fixes included in this update address the following CVE numbers :

CVE-2012-3955 (dhcp issue)

CVE-2011-4355 (gdb issue)

CVE-2012-4508, CVE-2013-0190, CVE-2013-0309, and CVE-2013-0310 (kernel issues)

CVE-2012-5536 (openssh issue)

CVE-2011-3148 and CVE-2011-3149 (pam issues)

CVE-2013-0157 (util-linux-ng issue)

This updated Red Hat Enterprise Virtualization Hypervisor package also fixes the following bugs :

* Previously, the Administration Portal would always display the option to upgrade the Red Hat Enterprise Virtualization Hypervisor ISO regardless of whether or not the selected host was up-to-date. Now, the VDSM version compatibility is considered and the upgrade message only displays if there is an upgrade relevant to the host available.
(BZ#853092)

* An out of date version of libvirt was included in the Red Hat Enterprise Virtualization Hypervisor 6.4 package. As a result, virtual machines with supported CPU models were not being properly parsed by libvirt and failed to start. A more recent version of libvirt has been included in this updated hypervisor package. Virtual machines now start normally. (BZ#895078)

As well, this update adds the following enhancement :

* Hypervisor packages now take advantage of the installonlypkg function provided by yum. This allows for multiple versions of the hypervisor package to be installed on a system concurrently without making changes to the yum configuration as was previously required.
(BZ#863579)

This update includes the ovirt-node build from RHBA-2013:0556 :

https://rhn.redhat.com/errata/RHBA-2013-0556.html

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to upgrade to this updated package, which fixes these issues and adds this enhancement.

block/scsi_ioctl.c in the Linux kernel through 3.8 does not properly consider the SCSI device class during authorization of SCSI commands, which allows local users to bypass intended access restrictions via an SG_IO ioctl call that leverages overlapping opcodes.(CVE-2012-4542)

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-0496 advisory.

  - Race condition in fs/ext4/extents.c in the Linux kernel before 3.4.16 allows local users to obtain     sensitive information from a deleted file by reading an extent that was not properly marked as     uninitialized. (CVE-2012-4508)

  - The xen_failsafe_callback function in Xen for the Linux kernel 2.6.23 and other versions, when running a     32-bit PVOPS guest, allows local users to cause a denial of service (guest crash) by triggering an iret     fault, leading to use of an incorrect stack pointer and stack corruption. (CVE-2013-0190)

  - block/scsi_ioctl.c in the Linux kernel through 3.8 does not properly consider the SCSI device class during     authorization of SCSI commands, which allows local users to bypass intended access restrictions via an     SG_IO ioctl call that leverages overlapping opcodes. (CVE-2012-4542)

  - arch/x86/include/asm/pgtable.h in the Linux kernel before 3.6.2, when transparent huge pages are used,     does not properly support PROT_NONE memory regions, which allows local users to cause a denial of service     (system crash) via a crafted application. (CVE-2013-0309)

  - The cipso_v4_validate function in net/ipv4/cipso_ipv4.c in the Linux kernel before 3.4.8 allows local     users to cause a denial of service (NULL pointer dereference and system crash) or possibly have     unspecified other impact via an IPOPT_CIPSO IP_OPTIONS setsockopt system call. (CVE-2013-0310)

  - The translate_desc function in drivers/vhost/vhost.c in the Linux kernel before 3.7 does not properly     handle cross-region descriptors, which allows guest OS users to obtain host OS privileges by leveraging     KVM guest OS privileges. (CVE-2013-0311)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-2534 advisory.

  - block/scsi_ioctl.c in the Linux kernel through 3.8 does not properly consider the SCSI device class during     authorization of SCSI commands, which allows local users to bypass intended access restrictions via an     SG_IO ioctl call that leverages overlapping opcodes. (CVE-2012-4542)

  - The llc_ui_getname function in net/llc/af_llc.c in the Linux kernel before 3.6 has an incorrect return     value in certain circumstances, which allows local users to obtain sensitive information from kernel stack     memory via a crafted application that leverages an uninitialized pointer argument. (CVE-2012-6542)

  - The KVM subsystem in the Linux kernel before 3.0 does not check whether kernel addresses are specified     during allocation of memory slots for use in a guest's physical address space, which allows local users to     gain privileges or obtain sensitive information from kernel memory via a crafted application, related to     arch/x86/kvm/paging_tmpl.h and virt/kvm/kvm_main.c. (CVE-2013-1943)

  - Heap-based buffer overflow in the tg3_read_vpd function in drivers/net/ethernet/broadcom/tg3.c in the     Linux kernel before 3.8.6 allows physically proximate attackers to cause a denial of service (system     crash) or possibly execute arbitrary code via crafted firmware that specifies a long string in the Vital     Product Data (VPD) data structure. (CVE-2013-1929)

  - Heap-based buffer overflow in the wdm_in_callback function in drivers/usb/class/cdc-wdm.c in the Linux     kernel before 3.8.4 allows physically proximate attackers to cause a denial of service (system crash) or     possibly execute arbitrary code via a crafted cdc-wdm USB device. (CVE-2013-1860)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Updated kernel-rt packages that fix several security issues and three bugs are now available for Red Hat Enterprise MRG 2.3.

The Red Hat Security Response Team 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-rt packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issues :

* A flaw was found in the way file permission checks for the '/dev/cpu/[x]/msr' files were performed in restricted root environments (for example, when using a capability-based security model). A local user with the ability to write to these files could use this flaw to escalate their privileges to kernel level, for example, by writing to the SYSENTER_EIP_MSR register. (CVE-2013-0268, Important)

* A race condition was found in the way the Linux kernel's ptrace implementation handled PTRACE_SETREGS requests when the debuggee was woken due to a SIGKILL signal instead of being stopped. A local, unprivileged user could use this flaw to escalate their privileges.
(CVE-2013-0871, Important)

* An out-of-bounds access flaw was found in the way SOCK_DIAG_BY_FAMILY Netlink messages were processed in the Linux kernel. A local, unprivileged user could use this flaw to escalate their privileges. (CVE-2013-1763, Important)

* It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A flaw was found in the way the __skb_recv_datagram() function in the Linux kernel processed payload-less socket buffers (skb) when the MSG_PEEK option was requested. A local, unprivileged user could use this flaw to cause a denial of service (infinite loop).
(CVE-2013-0290, Moderate)

The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes the following bugs :

* There was high contention on run-queue lock when load balancing before idling, causing latency spikes on high CPU core count systems.
With this update, IPI is used to send notification to cores with pending work, and the cores push the work rather than trying to pull it, resolving this issue. (BZ#858396)

* Previously, ACPI lock was converted to an rt_mutex, leading to a traceback when scheduling while atomic. With this update, ACPI lock has been converted back to a raw spinlock. (BZ#909965)

* Fibre Channel (FC)/iSCSI device state was set to off-line and after a timeout, not set back to running. Such a device would not come back online after a fast_io_fail or timeout. With this update, an explicit check for the device being offline has been added, and the device is set back to running when re-initializing, allowing devices to recover after a failure or timeout. (BZ#912942)

Users should upgrade to these updated packages, which correct these issues. The system must be rebooted for this update to take effect.

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2013-0496.

ID	Name	Product	Family	Published	Updated	Severity
78963	RHEL 6 : kernel (RHSA-2013:0928)	Nessus	Red Hat Local Security Checks	11/8/2014	1/14/2021	medium
68853	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2013-2523)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/8/2021	medium
65134	CentOS 6 : kernel (CESA-2013:0496)	Nessus	CentOS Local Security Checks	3/10/2013	1/4/2021	medium
65171	RHEL 6 : kernel (RHSA-2013:0496)	Nessus	Red Hat Local Security Checks	3/10/2013	1/14/2021	medium
66705	RHEL 6 : kernel (RHSA-2013:0882)	Nessus	Red Hat Local Security Checks	5/31/2013	1/14/2021	medium
68855	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel Security (ELSA-2013-2525)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/16/2022	high
78950	RHEL 6 : rhev-hypervisor6 (RHSA-2013:0579)	Nessus	Red Hat Local Security Checks	11/8/2014	1/14/2021	medium
78696	F5 Networks BIG-IP : Linux kernel vulnerability (SOL15746)	Nessus	F5 Networks Local Security Checks	10/28/2014	3/10/2021	medium
68739	Oracle Linux 6 : Oracle / Linux / 6 / kernel (ELSA-2013-0496)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/8/2021	medium
68856	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel Security (ELSA-2013-2534)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/8/2021	high
76659	RHEL 6 : MRG (RHSA-2013:0622)	Nessus	Red Hat Local Security Checks	7/22/2014	1/14/2021	high
801535	CentOS RHSA-2013-0496 Security Check	Log Correlation Engine	Generic			high

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