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.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - Qemu: net: buffer overflow in MIPSnet emulator (CVE-2016-4002)

  - 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)

  - Integer overflow in the VNC display driver in QEMU before 2.1.0 allows attachers to cause a denial of     service (process crash) via a CLIENT_CUT_TEXT message, which triggers an infinite loop. (CVE-2015-5239)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

The remote Redhat Enterprise Linux 5 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - qemu: insufficient parameter validation during ram load (CVE-2014-7840)

  - Qemu: net: buffer overflow in MIPSnet emulator (CVE-2016-4002)

  - 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)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

Vasily Kulikov discovered a flaw in the Linux Kernel's perf tool that allows for privilege escalation. A local user could exploit this flaw to run commands as root when using the perf tool. (CVE-2013-1060)

Michael S. Tsirkin discovered a flaw in how the Linux kernel's KVM subsystem allocates memory slots for the guest's address space. A local user could exploit this flaw to gain system privileges or obtain sensitive information from kernel memory. (CVE-2013-1943)

A flaw was discovered in the SCTP (stream control transfer protocol) network protocol's handling of duplicate cookies in the Linux kernel.
A remote attacker could exploit this flaw to cause a denial of service (system crash) on another remote user querying the SCTP connection.
(CVE-2013-2206)

Hannes Frederic Sowa discovered a flaw in setsockopt UDP_CORK option in the Linux kernel's IPv6 stack. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4162).

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

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

    - KVM: add missing void __user COPYING CREDITS Documentation Kbuild MAINTAINERS Makefile README REPORTING-     BUGS arch block crypto drivers firmware fs include init ipc kernel lib mm net samples scripts security     sound tools uek-rpm usr virt cast to access_ok() call (Heiko Carstens) [Orabug: 16941620] {CVE-2013-1943}
    - KVM: Validate userspace_addr of memslot when registered (Takuya Yoshikawa) [Orabug: 16941620]     {CVE-2013-1943}
    - tg3: fix length overflow in VPD firmware parsing (Kees Cook) [Orabug: 16837019] {CVE-2013-1929}
    - USB: cdc-wdm: fix buffer overflow (Oliver Neukum) [Orabug: 16837003] {CVE-2013-1860}
    - block: default SCSI command filter does not accomodate commands overlap across device classes (Jamie     Iles) [Orabug: 16387136] {CVE-2012-4542}
    - mm/hotplug: correctly add new zone to all other nodes' zone lists (Jiang Liu) [Orabug: 16603569]     {CVE-2012-5517}
    - ptrace: ptrace_resume() shouldn't wake up !TASK_TRACED thread (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - ptrace: introduce signal_wake_up_state() and ptrace_signal_wake_up() (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - Bluetooth: Fix incorrect strncpy() in hidp_setup_hid() (Anderson Lizardo) [Orabug: 16711062]     {CVE-2013-0349}
    - dccp: check ccid before dereferencing (Mathias Krause) [Orabug: 16711040] {CVE-2013-1827}
    - USB: io_ti: Fix NULL dereference in chase_port() (Wolfgang Frisch) [Orabug: 16425435] {CVE-2013-1774}
    - keys: fix race with concurrent install_user_keyrings() (David Howells) [Orabug: 16493369]     {CVE-2013-1792}
    - KVM: Fix bounds checking in ioapic indirect register reads (CVE-2013-1798) (Andy Honig) [Orabug:
    16710937] {CVE-2013-1798}
    - KVM: x86: fix for buffer overflow in handling of MSR_KVM_SYSTEM_TIME (CVE-2013-1796) (Jerry Snitselaar)     [Orabug: 16710794] {CVE-2013-1796}
    - net/tun: fix ioctl() based info leaks (Mathias Krause) [Orabug: 16675501] {CVE-2012-6547}
    - atm: fix info leak via getsockname() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6546}
    - atm: fix info leak in getsockopt(SO_ATMPVC) (Mathias Krause) [Orabug: 16675501] {CVE-2012-6546}
    - xfrm_user: fix info leak in copy_to_user_tmpl() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6537}
    - xfrm_user: fix info leak in copy_to_user_policy() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6537}
    - xfrm_user: fix info leak in copy_to_user_state() (Mathias Krause) [Orabug: 16675501] {CVE-2013-6537}
    - xfrm_user: return error pointer instead of NULL #2 (Mathias Krause) [Orabug: 16675501] {CVE-2013-1826}
    - xfrm_user: return error pointer instead of NULL (Mathias Krause) [Orabug: 16675501] {CVE-2013-1826}
    - llc: fix info leak via getsockname() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6542}

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 Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-0911 advisory.

  - A certain Red Hat patch to the KVM subsystem in the kernel package before 2.6.32-358.11.1.el6 on Red Hat     Enterprise Linux (RHEL) 6 does not properly implement the PV EOI feature, which allows guest OS users to     cause a denial of service (host OS crash) by leveraging a time window during which interrupts are disabled     but copy_to_user function calls are possible. (CVE-2013-1935)

  - 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)

  - The veth (aka virtual Ethernet) driver in the Linux kernel before 2.6.34 does not properly manage skbs     during congestion, which allows remote attackers to cause a denial of service (system crash) by leveraging     lack of skb consumption in conjunction with a double-free error. (CVE-2013-2017)

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 three security issues, several bugs, and add one enhancement 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.

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 KVM (Kernel-based Virtual Machine) initialized a guest's registered pv_eoi (paravirtualized end-of-interrupt) indication flag when entering the guest. An unprivileged guest user could potentially use this flaw to crash the host. (CVE-2013-1935, Important)

* A missing sanity check was found in the kvm_set_memory_region() function in KVM, allowing a user-space process to register memory regions pointing to the kernel address space. A local, unprivileged user could use this flaw to escalate their privileges. (CVE-2013-1943, Important)

* A double free flaw was found in the Linux kernel's Virtual Ethernet Tunnel driver (veth). A remote attacker could possibly use this flaw to crash a target system. (CVE-2013-2017, Moderate)

Red Hat would like to thank IBM for reporting the CVE-2013-1935 issue and Atzm WATANABE of Stratosphere Inc. for reporting the CVE-2013-2017 issue. The CVE-2013-1943 issue was discovered by Michael S. Tsirkin of Red Hat.

This update also fixes several bugs and adds one enhancement.
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 and add this enhancement.
The system must be rebooted for this update to take effect.

This update fixes the following security issues :

  - A flaw was found in the way KVM (Kernel-based Virtual     Machine) initialized a guest's registered pv_eoi     (paravirtualized end-of-interrupt) indication flag when     entering the guest. An unprivileged guest user could     potentially use this flaw to crash the host.
    (CVE-2013-1935, Important)

  - A missing sanity check was found in the     kvm_set_memory_region() function in KVM, allowing a     user-space process to register memory regions pointing     to the kernel address space. A local, unprivileged user     could use this flaw to escalate their privileges.
    (CVE-2013-1943, Important)

  - A double free flaw was found in the Linux kernel's     Virtual Ethernet Tunnel driver (veth). A remote attacker     could possibly use this flaw to crash a target system.
    (CVE-2013-2017, Moderate)

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

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:0911 advisory.

    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 KVM (Kernel-based Virtual Machine)     initialized a guest's registered pv_eoi (paravirtualized end-of-interrupt)     indication flag when entering the guest. An unprivileged guest user could     potentially use this flaw to crash the host. (CVE-2013-1935, Important)

    * A missing sanity check was found in the kvm_set_memory_region() function     in KVM, allowing a user-space process to register memory regions pointing     to the kernel address space. A local, unprivileged user could use this flaw     to escalate their privileges. (CVE-2013-1943, Important)

    * A double free flaw was found in the Linux kernel's Virtual Ethernet     Tunnel driver (veth). A remote attacker could possibly use this flaw to     crash a target system. (CVE-2013-2017, Moderate)

    Red Hat would like to thank IBM for reporting the CVE-2013-1935 issue and     Atzm WATANABE of Stratosphere Inc. for reporting the CVE-2013-2017 issue.
    The CVE-2013-1943 issue was discovered by Michael S. Tsirkin of Red Hat.

    This update also fixes several bugs and adds one enhancement. 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 and add this enhancement. The system must     be rebooted for this update to 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 these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
199963	RHEL 6 : kvm (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
199962	RHEL 5 : kvm (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
83611	SUSE SLES11 Security Update : kernel (SUSE-SU-2014:0287-1)	Nessus	SuSE Local Security Checks	high
69808	Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-1940-1)	Nessus	Ubuntu Local Security Checks	medium
69807	Ubuntu 10.04 LTS : linux vulnerabilities (USN-1939-1)	Nessus	Ubuntu Local Security Checks	medium
68856	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel Security (ELSA-2013-2534)	Nessus	Oracle Linux Local Security Checks	high
68834	Oracle Linux 6 : kernel (ELSA-2013-0911)	Nessus	Oracle Linux Local Security Checks	high
66887	CentOS 6 : kernel (CESA-2013:0911)	Nessus	CentOS Local Security Checks	high
66884	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20130610)	Nessus	Scientific Linux Local Security Checks	high
66853	RHEL 6 : kernel (RHSA-2013:0911)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2013-1943

high

Tenable Plugins

critical

critical

high

medium

medium

high

high

high

high

high