The copy_to_user_auth function in net/xfrm/xfrm_user.c in the Linux kernel before 3.6 uses an incorrect C library function for copying a string, which allows local users to obtain sensitive information from kernel heap memory by leveraging the CAP_NET_ADMIN capability.

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2013-454:03 advisory.

    The kernel package contains the Linux kernel (vmlinuz), the core of any Linux operating system. The kernel     handles the basic functions of the operating system: memory allocation, process allocation, device input     and output, etc.
    Security issues fixed with this release:
     CVE-2012-6537     net/xfrm/xfrm_user.c in the Linux kernel before 3.6 does not initialize certain structures, which allows     local users to obtain sensitive information from kernel memory by leveraging the CAP_NET_ADMIN capability.
     CVE-2012-6538     The copy_to_user_auth function in net/xfrm/xfrm_user.c in the Linux kernel before 3.6 uses an incorrect C     library function for copying a string, which allows local users to obtain sensitive information from     kernel heap memory by leveraging the CAP_NET_ADMIN capability.
     CVE-2012-6546     The ATM implementation in the Linux kernel before 3.6 does not initialize certain structures, which allows     local users to obtain sensitive information from kernel stack memory via a crafted application.
     CVE-2012-6547     The __tun_chr_ioctl function in drivers/net/tun.c in the Linux kernel before 3.6 does not initialize a     certain structure, which allows local users to obtain sensitive information from kernel stack memory via a     crafted application.
     CVE-2013-0349     The hidp_setup_hid function in net/bluetooth/hidp/core.c in the Linux kernel before 3.7.6 does not     properly copy a certain name field, which allows local users to obtain sensitive information from kernel     memory by setting a long name and making an HIDPCONNADD ioctl call.
     CVE-2013-0913     Integer overflow in drivers/gpu/drm/i915/i915_gem_execbuffer.c in the i915 driver in the Direct Rendering     Manager (DRM) subsystem in the Linux kernel through 3.8.3, as used in Google Chrome OS before     25.0.1364.173 and other products, allows local users to cause a denial of service (heap-based buffer     overflow) or possibly have unspecified other impact via a crafted application that triggers many     relocation copies, and potentially leads to a race condition.
     CVE-2013-1767     Use-after-free vulnerability in the shmem_remount_fs function in mm/shmem.c in the Linux kernel before     3.7.10 allows local users to gain privileges or cause a denial of service (system crash) by remounting a     tmpfs filesystem without specifying a required mpol (aka mempolicy) mount option.
     CVE-2013-1773     Buffer overflow in the VFAT filesystem implementation in the Linux kernel before 3.3 allows local users to     gain privileges or cause a denial of service (system crash) via a VFAT write operation on a filesystem     with the utf8 mount option, which is not properly handled during UTF-8 to UTF-16 conversion.
     CVE-2013-1774     The chase_port function in drivers/usb/serial/io_ti.c in the Linux kernel before 3.7.4 allows local users     to cause a denial of service (NULL pointer dereference and system crash) via an attempted /dev/ttyUSB read     or write operation on a disconnected Edgeport USB serial converter.
     CVE-2013-1792     Race condition in the install_user_keyrings function in security/keys/process_keys.c in the Linux kernel     before 3.8.3 allows local users to cause a denial of service (NULL pointer dereference and system crash)     via crafted keyctl system calls that trigger keyring operations in simultaneous threads.
     CVE-2013-1796     The kvm_set_msr_common function in arch/x86/kvm/x86.c in the Linux kernel through 3.8.4 does not ensure a     required time_page alignment during an MSR_KVM_SYSTEM_TIME operation, which allows guest OS users to cause     a denial of service (buffer overflow and host OS memory corruption) or possibly have unspecified other     impact via a crafted application.
     CVE-2013-1797     Use-after-free vulnerability in arch/x86/kvm/x86.c in the Linux kernel through 3.8.4 allows guest OS users     to cause a denial of service (host OS memory corruption) or possibly have unspecified other impact via a     crafted application that triggers use of a guest physical address (GPA) in (1) movable or (2) removable     memory during an MSR_KVM_SYSTEM_TIME kvm_set_msr_common operation.
     CVE-2013-1798     The ioapic_read_indirect function in virt/kvm/ioapic.c in the Linux kernel through 3.8.4 does not properly     handle a certain combination of invalid IOAPIC_REG_SELECT and IOAPIC_REG_WINDOW operations, which allows     guest OS users to obtain sensitive information from host OS memory or cause a denial of service (host OS     OOPS) via a crafted application.
     CVE-2013-1826     The xfrm_state_netlink function in net/xfrm/xfrm_user.c in the Linux kernel before 3.5.7 does not properly     handle error conditions in dump_one_state function calls, which allows local users to gain privileges or     cause a denial of service (NULL pointer dereference and system crash) by leveraging the CAP_NET_ADMIN     capability.
     CVE-2013-1827     net/dccp/ccid.h in the Linux kernel before 3.5.4 allows local users to gain privileges or cause a denial     of service (NULL pointer dereference and system crash) by leveraging the CAP_NET_ADMIN capability for a     certain (1) sender or (2) receiver getsockopt call.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

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

Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.

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.

Security :

* An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way the Intel i915 driver in the Linux kernel handled the allocation of the buffer used for relocation copies. A local user with console access could use this flaw to cause a denial of service or escalate their privileges. (CVE-2013-0913, 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)

* A race condition in install_user_keyrings(), leading to a NULL pointer dereference, was found in the key management facility. A local, unprivileged user could use this flaw to cause a denial of service. (CVE-2013-1792, Moderate)

* A NULL pointer dereference in the XFRM implementation could allow a local user who has the CAP_NET_ADMIN capability to cause a denial of service. (CVE-2013-1826, Moderate)

* A NULL pointer dereference in the Datagram Congestion Control Protocol (DCCP) implementation could allow a local user to cause a denial of service. (CVE-2013-1827, Moderate)

* Information leak flaws in the XFRM implementation could allow a local user who has the CAP_NET_ADMIN capability to leak kernel stack memory to user-space. (CVE-2012-6537, Low)

* Two information leak flaws in the Asynchronous Transfer Mode (ATM) subsystem could allow a local, unprivileged user to leak kernel stack memory to user-space. (CVE-2012-6546, Low)

* An information leak was found in the TUN/TAP device driver in the networking implementation. A local user with access to a TUN/TAP virtual interface could use this flaw to leak kernel stack memory to user-space. (CVE-2012-6547, Low)

* An information leak in the Bluetooth implementation could allow a local user who has the CAP_NET_ADMIN capability to leak kernel stack memory to user-space. (CVE-2013-0349, Low)

* 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 NULL pointer dereference was found in the Linux kernel's USB Inside Out Edgeport Serial Driver implementation. An attacker with physical access to a system could use this flaw to cause a denial of service. (CVE-2013-1774, Low)

Red Hat would like to thank Andrew Honig of Google for reporting CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798. CVE-2013-1792 was discovered by Mateusz Guzik of Red Hat EMEA GSS SEG Team.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:0744 advisory.

    Security:

    * An integer overflow flaw, leading to a heap-based buffer overflow, was     found in the way the Intel i915 driver in the Linux kernel handled the     allocation of the buffer used for relocation copies. A local user with     console access could use this flaw to cause a denial of service or escalate     their privileges. (CVE-2013-0913, 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)

    * A race condition in install_user_keyrings(), leading to a NULL pointer     dereference, was found in the key management facility. A local,     unprivileged user could use this flaw to cause a denial of service.
    (CVE-2013-1792, Moderate)

    * A NULL pointer dereference in the XFRM implementation could allow a local     user who has the CAP_NET_ADMIN capability to cause a denial of service.
    (CVE-2013-1826, Moderate)

    * A NULL pointer dereference in the Datagram Congestion Control Protocol     (DCCP) implementation could allow a local user to cause a denial of     service. (CVE-2013-1827, Moderate)

    * Information leak flaws in the XFRM implementation could allow a local     user who has the CAP_NET_ADMIN capability to leak kernel stack memory to     user-space. (CVE-2012-6537, Low)

    * Two information leak flaws in the Asynchronous Transfer Mode (ATM)     subsystem could allow a local, unprivileged user to leak kernel stack     memory to user-space. (CVE-2012-6546, Low)

    * An information leak was found in the TUN/TAP device driver in the     networking implementation. A local user with access to a TUN/TAP virtual     interface could use this flaw to leak kernel stack memory to user-space.
    (CVE-2012-6547, Low)

    * An information leak in the Bluetooth implementation could allow a local     user who has the CAP_NET_ADMIN capability to leak kernel stack memory to     user-space. (CVE-2013-0349, Low)

    * 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 NULL pointer dereference was found in the Linux kernel's USB Inside Out     Edgeport Serial Driver implementation. An attacker with physical access to     a system could use this flaw to cause a denial of service. (CVE-2013-1774,     Low)

    Red Hat would like to thank Andrew Honig of Google for reporting     CVE-2013-1796, CVE-2013-1797, and CVE-2013-1798. CVE-2013-1792 was     discovered by Mateusz Guzik of Red Hat EMEA GSS SEG Team.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

ID	Name	Product	Family	Severity
289795	MiracleLinux 4 : kernel-2.6.32-358.6.1.el6 (AXSA:2013-454:03)	Nessus	Miracle Linux Local Security Checks	medium
83611	SUSE SLES11 Security Update : kernel (SUSE-SU-2014:0287-1)	Nessus	SuSE Local Security Checks	high
66204	CentOS 6 : kernel (CESA-2013:0744)	Nessus	CentOS Local Security Checks	high
66192	RHEL 6 : kernel (RHSA-2013:0744)	Nessus	Red Hat Local Security Checks	medium

Detections

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CVE-2012-6538

medium

Tenable Plugins

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high

high

medium