Linux kernel 2.6.33 and 2.6.34.y does not initialize the kvm_vcpu_events->interrupt.pad structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via unspecified vectors.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Linux kernel 2.6.33 and 2.6.34.y does not initialize the kvm_vcpu_events->interrupt.pad structure member,     which allows local users to obtain potentially sensitive information from kernel stack memory via     unspecified vectors. (CVE-2010-4525)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2011-0028 advisory.

    - CVE: CVE-2010-4525
    - Resolves: bz#570532       (CVE-2010-0435 kvm: vmx null pointer dereference)
    - CVE: CVE-2010-0435
    - Related: bz#639887       (CVE-2010-3698 kvm: invalid selector in fs/gs causes kernel panic [rhel-5.6])
    - Resolves: bz#639887       (CVE-2010-3698 kvm: invalid selector in fs/gs causes kernel panic [rhel-5.6])
    - Resolves: bz#649929       (CVE-2010-3881 kvm: arch/x86/kvm/x86.c: reading uninitialized stack memory [5.6])
    - CVE: CVE-2010-0431
    - Resolves: bz#568817       (CVE-2010-0431 qemu: Insufficient guest provided pointers validation)
    - Resolves: bz#619413       (CVE-2010-2784 qemu: insufficient constraints checking in exec.c:subpage_register() [rhel-5.6])

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

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

The openSUSE 11.3 kernel was updated to 2.6.34.8 to fix various bugs and security issues.

Following security issues have been fixed: CVE-2011-1493: In the rose networking stack, when parsing the FAC_NATIONAL_DIGIS facilities field, it was possible for a remote host to provide more digipeaters than expected, resulting in heap corruption. Check against ROSE_MAX_DIGIS to prevent overflows, and abort facilities parsing on failure.

CVE-2011-1182: Local attackers could send signals to their programs that looked like coming from the kernel, potentially gaining privileges in the context of setuid programs.

CVE-2011-1082: The epoll subsystem in Linux did not prevent users from creating circular epoll file structures, potentially leading to a denial of service (kernel deadlock).

CVE-2011-1478: An issue in the core GRO code where an skb belonging to an unknown VLAN is reused could result in a NULL pointer dereference.

CVE-2011-1163: The code for evaluating OSF partitions (in fs/partitions/osf.c) contained a bug that leaks data from kernel heap memory to userspace for certain corrupted OSF partitions.

CVE-2011-1012: The code for evaluating LDM partitions (in fs/partitions/ldm.c) contained a bug that could crash the kernel for certain corrupted LDM partitions.

CVE-2011-1010: The code for evaluating Mac partitions (in fs/partitions/mac.c) contained a bug that could crash the kernel for certain corrupted Mac partitions.

CVE-2011-1476: Specially crafted requests may be written to /dev/sequencer resulting in an underflow when calculating a size for a copy_from_user() operation in the driver for MIDI interfaces. On x86, this just returns an error, but it could have caused memory corruption on other architectures. Other malformed requests could have resulted in the use of uninitialized variables.

CVE-2011-1477: Due to a failure to validate user-supplied indexes in the driver for Yamaha YM3812 and OPL-3 chips, a specially crafted ioctl request could have been sent to /dev/sequencer, resulting in reading and writing beyond the bounds of heap buffers, and potentially allowing privilege escalation.

CVE-2011-0191: A information leak in the XFS geometry calls could be used by local attackers to gain access to kernel information.

CVE-2011-1090: A page allocator issue in NFS v4 ACL handling that could lead to a denial of service (crash) was fixed.

CVE-2010-3880: net/ipv4/inet_diag.c in the Linux kernel did not properly audit INET_DIAG bytecode, which allowed local users to cause a denial of service (kernel infinite loop) via crafted INET_DIAG_REQ_BYTECODE instructions in a netlink message that contains multiple attribute elements, as demonstrated by INET_DIAG_BC_JMP instructions.

CVE-2010-4656: Fixed a buffer size issue in 'usb iowarrior' module, where a malicious device could overflow a kernel buffer.

CVE-2011-0521: The dvb_ca_ioctl function in drivers/media/dvb/ttpci/av7110_ca.c in the Linux kernel did not check the sign of a certain integer field, which allowed local users to cause a denial of service (memory corruption) or possibly have unspecified other impact via a negative value.

CVE-2010-3875: The ax25_getname function in net/ax25/af_ax25.c in the Linux kernel did not initialize a certain structure, which allowed local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this structure.

CVE-2010-3876: net/packet/af_packet.c in the Linux kernel did not properly initialize certain structure members, which allowed local users to obtain potentially sensitive information from kernel stack memory by leveraging the CAP_NET_RAW capability to read copies of the applicable structures.

CVE-2010-3877: The get_name function in net/tipc/socket.c in the Linux kernel did not initialize a certain structure, which allowed local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this structure.

CVE-2010-3705: The sctp_auth_asoc_get_hmac function in net/sctp/auth.c in the Linux kernel did not properly validate the hmac_ids array of an SCTP peer, which allowed remote attackers to cause a denial of service (memory corruption and panic) via a crafted value in the last element of this array.

CVE-2011-0711: A stack memory information leak in the xfs FSGEOMETRY_V1 ioctl was fixed.

CVE-2011-0712: Multiple buffer overflows in the caiaq Native Instruments USB audio functionality in the Linux kernel might have allowed attackers to cause a denial of service or possibly have unspecified other impact via a long USB device name, related to (1) the snd_usb_caiaq_audio_init function in sound/usb/caiaq/audio.c and (2) the snd_usb_caiaq_midi_init function in sound/usb/caiaq/midi.c.

CVE-2010-4525: Linux kernel did not initialize the kvm_vcpu_events->interrupt.pad structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via unspecified vectors.

CVE-2010-3881: arch/x86/kvm/x86.c in the Linux kernel did not initialize certain structure members, which allowed local users to obtain potentially sensitive information from kernel stack memory via read operations on the /dev/kvm device.

CVE-2010-4075: The uart_get_count function in drivers/serial/serial_core.c in the Linux kernel did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call.

CVE-2010-4076: The rs_ioctl function in drivers/char/amiserial.c in the Linux kernel did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call.

CVE-2010-4077: The ntty_ioctl_tiocgicount function in drivers/char/nozomi.c in the Linux kernel did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call.

CVE-2010-4248: Race condition in the __exit_signal function in kernel/exit.c in the Linux kernel allowed local users to cause a denial of service via vectors related to multithreaded exec, the use of a thread group leader in kernel/posix-cpu-timers.c, and the selection of a new thread group leader in the de_thread function in fs/exec.c.

CVE-2010-4243: fs/exec.c in the Linux kernel did not enable the OOM Killer to assess use of stack memory by arrays representing the (1) arguments and (2) environment, which allows local users to cause a denial of service (memory consumption) via a crafted exec system call, aka an 'OOM dodging issue,' a related issue to CVE-2010-3858.

CVE-2010-4251: A system out of memory condition (denial of service) could be triggered with a large socket backlog, exploitable by local users. This has been addressed by backlog limiting.

CVE-2010-4648: Fixed cryptographic weakness potentially leaking information to remote (but physically nearby) users in the orinoco wireless driver.

CVE-2010-4527: The load_mixer_volumes function in sound/oss/soundcard.c in the OSS sound subsystem in the Linux kernel incorrectly expected that a certain name field ends with a '\0' character, which allowed local users to conduct buffer overflow attacks and gain privileges, or possibly obtain sensitive information from kernel memory, via a SOUND_MIXER_SETLEVELS ioctl call.

CVE-2010-4668: The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel allowed local users to cause a denial of service (panic) via a zero-length I/O request in a device ioctl to a SCSI device, related to an unaligned map. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4163.

CVE-2010-4650: A kernel buffer overflow in the cuse server module was fixed, which might have allowed local privilege escalation. However only CUSE servers could exploit it and /dev/cuse is normally restricted to root.

CVE-2010-4649: Integer overflow in the ib_uverbs_poll_cq function in drivers/infiniband/core/uverbs_cmd.c in the Linux kernel allowed local users to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large value of a certain structure member.

CVE-2010-4250: A memory leak within inotify could be used by local attackers to cause the machine to run out of memory (denial of service).

CVE-2010-4346: The install_special_mapping function in mm/mmap.c in the Linux kernel did not make an expected security_file_mmap function call, which allowed local users to bypass intended mmap_min_addr restrictions and possibly conduct NULL pointer dereference attacks via a crafted assembly-language application.

CVE-2010-4529: Integer underflow in the irda_getsockopt function in net/irda/af_irda.c in the Linux kernel on platforms other than x86 allowed local users to obtain potentially sensitive information from kernel heap memory via an IRLMP_ENUMDEVICES getsockopt call.

CVE-2010-4342: The aun_incoming function in net/econet/af_econet.c in the Linux kernel, when Econet is enabled, allowed remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending an Acorn Universal Networking (AUN) packet over UDP.

CVE-2010-3849: The econet_sendmsg function in net/econet/af_econet.c in the Linux kernel, when an econet address is configured, allowed local users to cause a denial of service (NULL pointer dereference and OOPS) via a sendmsg call that specifies a NULL value for the remote address field.

CVE-2010-3848: Stack-based buffer overflow in the econet_sendmsg function in net/econet/af_econet.c in the Linux kernel when an econet address is configured, allowed local users to gain privileges by providing a large number of iovec structures.

CVE-2010-3850: The ec_dev_ioctl function in net/econet/af_econet.c in the Linux kernel did not require the CAP_NET_ADMIN capability, which allowed local users to bypass intended access restrictions and configure econet addresses via an SIOCSIFADDR ioctl call.

CVE-2010-4343: drivers/scsi/bfa/bfa_core.c in the Linux kernel did not initialize a certain port data structure, which allows local users to cause a denial of service (system crash) via read operations on an fc_host statistics file.

CVE-2010-3699: The backend driver in Xen 3.x allows guest OS users to cause a denial of service via a kernel thread leak, which prevents the device and guest OS from being shut down or create a zombie domain, causes a hang in zenwatch, or prevents unspecified xm commands from working properly, related to (1) netback, (2) blkback, or (3) blktap.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2011-0007 advisory.

    - [kvm] x86: zero kvm_vcpu_events->interrupt.pad (Marcelo Tosatti) [665471 665409] {CVE-2010-4525}

    email_6.RHSA-2011-0007 178L, 11970C written
    - [netdrv] igb: only use vlan_gro_receive if vlans are registered (Stefan Assmann) [652804 660192]     {CVE-2010-4263}
    - [kernel] posix-cpu-timers: workaround to suppress the problems with mt exec (Oleg Nesterov) [656267     656268] {CVE-2010-4248}
    - [fs] bio: take care not overflow page count when mapping/copying user data (Danny Feng) [652530 652531]     {CVE-2010-4162}
    - [net] can-bcm: fix minor heap overflow (Danny Feng) [651846 651847] {CVE-2010-3874}
    - [net] filter: make sure filters dont read uninitialized memory (Jiri Pirko) [651704 651705]     {CVE-2010-4158}
    - [net] inet_diag: Make sure we actually run the same bytecode we audited (Jiri Pirko) [651268 651269]     {CVE-2010-3880}
    - [v4l] ivtvfb: prevent reading uninitialized stack memory (Mauro Carvalho Chehab) [648832 648833]     {CVE-2010-4079}
    - [drm] via/ioctl.c: prevent reading uninitialized stack memory (Dave Airlie) [648718 648719]     {CVE-2010-4082}
    - [char] nozomi: clear data before returning to userspace on TIOCGICOUNT (Mauro Carvalho Chehab) [648705     648706] {CVE-2010-4077}
    - [serial] clean data before filling it on TIOCGICOUNT (Mauro Carvalho Chehab) [648702 648703]     {CVE-2010-4075}
    - [net] af_unix: limit unix_tot_inflight (Neil Horman) [656761 656762] {CVE-2010-4249}
    - [block] check for proper length of iov entries in blk_rq_map_user_iov() (Danny Feng) [652958 652959]     {CVE-2010-4163}
    - [net] Limit sendto()/recvfrom()/iovec total length to INT_MAX (Jiri Pirko) [651894 651895]     {CVE-2010-4160}
    - [net] bluetooth: Fix missing NULL check (Jarod Wilson) [655667 655668] {CVE-2010-4242}
    - [kernel] ipc: initialize structure memory to zero for compat functions (Danny Feng) [648694 648695]     {CVE-2010-4073}
    - [kernel] shm: fix information leak to userland (Danny Feng) [648688 648689] {CVE-2010-4072}
    - [fs] xfs: prevent reading uninitialized stack memory (Dave Chinner) [630808 630809] {CVE-2010-3078}
    - [net] fix rds_iovec page count overflow (Jiri Pirko) [647423 647424] {CVE-2010-3865}
    - [usb] serial/mos*: prevent reading uninitialized stack memory (Don Zickus) [648697 648698]     {CVE-2010-4074}
    - [kernel] ecryptfs_uid_hash() buffer overflow (Jerome Marchand) [626320 611388] {CVE-2010-2492}
    - [sound] seq/oss - Fix double-free at error path of snd_seq_oss_open() (Jaroslav Kysela) [630554 630555]     {CVE-2010-3080}
    - [netdrv] prevent reading uninitialized memory in hso driver (Thomas Graf) [633143 633144]     {CVE-2010-3298}
    - [fs] aio: check for multiplication overflow in do_io_submit (Jeff Moyer) [629450 629451] {CVE-2010-3067}
    - [net] fix info leak from kernel in ethtool operation (Neil Horman) [646727 646728] {CVE-2010-3861}
    - [net] packet: fix information leak to userland (Jiri Pirko) [649899 649900] {CVE-2010-3876}
    - [net] clean up info leak in act_police (Neil Horman) [636393 636394] {CVE-2010-3477}
    - [net] Fix priv escalation in rds protocol (Neil Horman) [642899 642900] {CVE-2010-3904}
    - [v4l] Remove compat code for VIDIOCSMICROCODE (Mauro Carvalho Chehab) [642472 642473] {CVE-2010-2963}
    - [kernel] tracing: do not allow llseek to set_ftrace_filter (Jiri Olsa) [631625 631626] {CVE-2010-3079}
    - [drm] fix ioctls infoleak (Danny Feng) [626319 621437] {CVE-2010-2803}
    - [netdrv] wireless extensions: fix kernel heap content leak (John Linville) [628437 628438]     {CVE-2010-2955}
    - [netdrv] niu: buffer overflow for ETHTOOL_GRXCLSRLALL (Danny Feng) [632071 632072] {CVE-2010-3084}
    - [virt] KVM: Fix fs/gs reload oops with invalid ldt (Avi Kivity) [639884 639885] {CVE-2010-3698}
    - [drm] i915: prevent arbitrary kernel memory write (Jerome Marchand) [637690 637691] {CVE-2010-2962}
    - [kernel] prevent heap corruption in snd_ctl_new() (Jerome Marchand) [638485 638486] {CVE-2010-3442}
    - [block] Fix pktcdvd ioctl dev_minor range check (Jerome Marchand) [638088 638089] {CVE-2010-3437}
    - [net] sctp: Fix out-of-bounds reading in sctp_asoc_get_hmac() (Jiri Pirko) [640461 640462]     {CVE-2010-3705}
    - [net] sctp: Do not reset the packet during sctp_packet_config() (Jiri Pirko) [637681 637682]     {CVE-2010-3432}
    - [misc] make compat_alloc_user_space() incorporate the access_ok() (Xiaotian Feng) [634465 634466]     {CVE-2010-3081}
    - [x86] kernel: fix IA32 System Call Entry Point Vulnerability (Xiaotian Feng) [634451 634452]     {CVE-2010-3301}

Tenable has extracted the preceding description block directly from the Oracle 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.

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:0028 advisory.

    KVM (Kernel-based Virtual Machine) is a full virtualization solution for     Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for     the standard Red Hat Enterprise Linux kernel.

    A data structure field in kvm_vcpu_ioctl_x86_get_vcpu_events() in QEMU-KVM     was not initialized properly before being copied to user-space. A     privileged host user with access to /dev/kvm could use this flaw to leak     kernel stack memory to user-space. (CVE-2010-4525)

    Red Hat would like to thank Stephan Mueller of atsec information security     for reporting this issue.

    These updated packages also fix several bugs. Documentation for these bug     fixes will be available shortly in the kvm section of the Red Hat     Enterprise Linux 5.6 Technical Notes, linked to in the References.

    All KVM users should upgrade to these updated packages, which resolve this     issue as well as fixing the bugs noted in the Technical Notes. Note: The     procedure in the Solution section must be performed before this update will     take effect.

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

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

A data structure field in kvm_vcpu_ioctl_x86_get_vcpu_events() in QEMU-KVM was not initialized properly before being copied to user-space. A privileged host user with access to '/dev/kvm' could use this flaw to leak kernel stack memory to user-space. (CVE-2010-4525)

These updated packages also fix several bugs.

The following procedure must be performed before this update will take effect :

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using 'modprobe -r [module]') and reload (using 'modprobe [module]') all of the following modules which are currently running (determined using 'lsmod'): kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2011:0007 advisory.

    * Buffer overflow in eCryptfs. When /dev/ecryptfs has world writable     permissions (which it does not, by default, on Red Hat Enterprise Linux 6),     a local, unprivileged user could use this flaw to cause a denial of service     or possibly escalate their privileges. (CVE-2010-2492, Important)

    * Integer overflow in the RDS protocol implementation could allow a local,     unprivileged user to cause a denial of service or escalate their     privileges. (CVE-2010-3865, Important)

    * Missing boundary checks in the PPP over L2TP sockets implementation could     allow a local, unprivileged user to cause a denial of service or escalate     their privileges. (CVE-2010-4160, Important)

    * NULL pointer dereference in the igb driver. If both Single Root I/O     Virtualization (SR-IOV) and promiscuous mode were enabled on an interface     using igb, it could result in a denial of service when a tagged VLAN packet     is received on that interface. (CVE-2010-4263, Important)

    * Missing initialization flaw in the XFS file system implementation, and in     the network traffic policing implementation, could allow a local,     unprivileged user to cause an information leak. (CVE-2010-3078,     CVE-2010-3477, Moderate)

    * NULL pointer dereference in the Open Sound System compatible sequencer     driver could allow a local, unprivileged user with access to /dev/sequencer     to cause a denial of service. /dev/sequencer is only accessible to root and     users in the audio group by default. (CVE-2010-3080, Moderate)

    * Flaw in the ethtool IOCTL handler could allow a local user to cause an     information leak. (CVE-2010-3861, Moderate)

    * Flaw in bcm_connect() in the Controller Area Network (CAN) Broadcast     Manager. On 64-bit systems, writing the socket address may overflow the     procname character array. (CVE-2010-3874, Moderate)

    * Flaw in the module for monitoring the sockets of INET transport     protocols could allow a local, unprivileged user to cause a denial of     service. (CVE-2010-3880, Moderate)

    * Missing boundary checks in the block layer implementation could allow a     local, unprivileged user to cause a denial of service. (CVE-2010-4162,     CVE-2010-4163, CVE-2010-4668, Moderate)

    * NULL pointer dereference in the Bluetooth HCI UART driver could allow a     local, unprivileged user to cause a denial of service. (CVE-2010-4242,     Moderate)

    * Flaw in the Linux kernel CPU time clocks implementation for the POSIX     clock interface could allow a local, unprivileged user to cause a denial of     service. (CVE-2010-4248, Moderate)

    * Flaw in the garbage collector for AF_UNIX sockets could allow a local,     unprivileged user to trigger a denial of service. (CVE-2010-4249, Moderate)

    * Missing upper bound integer check in the AIO implementation could allow a     local, unprivileged user to cause an information leak. (CVE-2010-3067, Low)

    * Missing initialization flaws could lead to information leaks.
    (CVE-2010-3298, CVE-2010-3876, CVE-2010-4072, CVE-2010-4073, CVE-2010-4074,     CVE-2010-4075, CVE-2010-4077, CVE-2010-4079, CVE-2010-4080, CVE-2010-4081,     CVE-2010-4082, CVE-2010-4083, CVE-2010-4158, Low)

    * Missing initialization flaw in KVM could allow a privileged host user     with access to /dev/kvm to cause an information leak. (CVE-2010-4525, Low)

    Red Hat would like to thank Andre Osterhues for reporting CVE-2010-2492;
    Thomas Pollet for reporting CVE-2010-3865; Dan Rosenberg for reporting     CVE-2010-4160, CVE-2010-3078, CVE-2010-3874, CVE-2010-4162, CVE-2010-4163,     CVE-2010-3298, CVE-2010-4073, CVE-2010-4074, CVE-2010-4075, CVE-2010-4077,     CVE-2010-4079, CVE-2010-4080, CVE-2010-4081, CVE-2010-4082, CVE-2010-4083,     and CVE-2010-4158; Kosuke Tatsukawa for reporting CVE-2010-4263; Tavis     Ormandy for reporting CVE-2010-3080 and CVE-2010-3067; Kees Cook for     reporting CVE-2010-3861 and CVE-2010-4072; Nelson Elhage for reporting     CVE-2010-3880; Alan Cox for reporting CVE-2010-4242; Vegard Nossum for     reporting CVE-2010-4249; Vasiliy Kulikov for reporting CVE-2010-3876; and     Stephan Mueller of atsec information security for reporting CVE-2010-4525.

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
217315	Linux Distros Unpatched Vulnerability : CVE-2010-4525	Nessus	Misc.	medium
181017	Oracle Linux 5 : kvm (ELSA-2011-0028)	Nessus	Oracle Linux Local Security Checks	medium
75554	openSUSE Security Update : kernel (openSUSE-SU-2011:0399-1)	Nessus	SuSE Local Security Checks	high
68177	Oracle Linux 6 : kernel (ELSA-2011-0007)	Nessus	Oracle Linux Local Security Checks	high
63968	RHEL 5 : kvm (RHSA-2011:0028)	Nessus	Red Hat Local Security Checks	medium
60934	Scientific Linux Security Update : kvm on SL5.x x86_64	Nessus	Scientific Linux Local Security Checks	low
51500	RHEL 6 : kernel (RHSA-2011:0007)	Nessus	Red Hat Local Security Checks	high

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CVE-2010-4525

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