ID

VAR-201611-0386

CVE

CVE-2016-5195

TITLE

Linux kernel Competitive conditional vulnerability

DESCRIPTION

Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect handling of a copy-on-write (COW) feature to write to a read-only memory mapping, as exploited in the wild in October 2016, aka "Dirty COW.". Linux kernel is prone to a local privilege-escalation vulnerability. Local attackers may exploit this issue to gain elevated privileges. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security update Advisory ID: RHSA-2016:2110-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-2110.html Issue date: 2016-10-26 CVE Names: CVE-2016-5195 CVE-2016-7039 ===================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64 Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64 3. Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. (CVE-2016-5195, Important) * Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow issue. It could occur while receiving large packets via GRO path; As an unlimited recursion could unfold in both VLAN and TEB modules, leading to a stack corruption in the kernel. (CVE-2016-7039, Important) Red Hat would like to thank Phil Oester for reporting CVE-2016-5195. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. 5. Bugs fixed (https://bugzilla.redhat.com/): 1375944 - CVE-2016-7039 kernel: remotely triggerable unbounded recursion in the vlan gro code leading to a kernel crash 1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage 6. Package List: Red Hat Enterprise Linux for Real Time for NFV (v. 7): Source: kernel-rt-3.10.0-327.36.3.rt56.238.el7.src.rpm noarch: kernel-rt-doc-3.10.0-327.36.3.rt56.238.el7.noarch.rpm x86_64: kernel-rt-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm Red Hat Enterprise Linux Realtime (v. 7): Source: kernel-rt-3.10.0-327.36.3.rt56.238.el7.src.rpm noarch: kernel-rt-doc-3.10.0-327.36.3.rt56.238.el7.noarch.rpm x86_64: kernel-rt-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-327.36.3.rt56.238.el7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFYEKKsXlSAg2UNWIIRAmI+AJkB5tkOU2r9pjWJ4cYCSD9mtyJFBwCgt+er yvfTfHwrbVXZfa/y1n2XeMs= =LaOt -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-4.4.0-45-generic 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-generic-lpae 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-lowlatency 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-powerpc-e500mc 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-powerpc-smp 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-powerpc64-emb 4.4.0-45.66~14.04.1 linux-image-4.4.0-45-powerpc64-smp 4.4.0-45.66~14.04.1 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Note: the current version of the following document is available here: https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-hpesbgn03722en_us SUPPORT COMMUNICATION - SECURITY BULLETIN Document ID: hpesbgn03722en_us Version: 1 HPESBGN03722 rev.1 - HPE Operations Agent, Local Escalation of Privilege NOTICE: The information in this Security Bulletin should be acted upon as soon as possible. Release Date: 2017-03-30 Last Updated: 2017-03-30 Potential Security Impact: Local: Escalation of Privilege Source: Hewlett Packard Enterprise, Product Security Response Team VULNERABILITY SUMMARY A security vulnerability in Linux kernel, also known as "Dirty COW", has been addressed in HPE Operations Agent. This vulnerability could be exploited locally to allow escalation of privilege. References: - CVE-2016-5195 - Linux kernel vulnerability, Dirty "COW" SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed. - HPE Operations agent software - v11.11, v11.12, v11.13, v11.14 BACKGROUND CVSS Base Metrics ================= Reference, CVSS V3 Score/Vector, CVSS V2 Score/Vector CVE-2016-5195 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 7.2 (AV:L/AC:L/Au:N/C:C/I:C/A:C) Information on CVSS is documented in HPE Customer Notice HPSN-2008-002 here: https://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01345499 RESOLUTION HPE has made the following mitigation steps available to resolve the vulnerability in the impacted versions of HPE Operations Agent. Login to the Operations Agent system with root privileges 2. Update the system using 'yum update kernel' command 3. Reboot the server using '/sbin/shutdown -r now' command Please contact HPE Technical Support if any assistance is needed regarding the mitigation steps. HISTORY Version:1 (rev.1) - 30 March 2017 Initial release Third Party Security Patches: Third party security patches that are to be installed on systems running Hewlett Packard Enterprise (HPE) software products should be applied in accordance with the customer's patch management policy. Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HPE Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hpe.com. Report: To report a potential security vulnerability for any HPE supported product: Web form: https://www.hpe.com/info/report-security-vulnerability Email: security-alert@hpe.com Subscribe: To initiate a subscription to receive future HPE Security Bulletin alerts via Email: http://www.hpe.com/support/Subscriber_Choice Security Bulletin Archive: A list of recently released Security Bulletins is available here: http://www.hpe.com/support/Security_Bulletin_Archive Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB. 3C = 3COM 3P = 3rd Party Software GN = HPE General Software HF = HPE Hardware and Firmware MU = Multi-Platform Software NS = NonStop Servers OV = OpenVMS PV = ProCurve ST = Storage Software UX = HP-UX Copyright 2016 Hewlett Packard Enterprise Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett Packard Enterprise and the names of Hewlett Packard Enterprise products referenced herein are trademarks of Hewlett Packard Enterprise in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners. 5.9 server) - i386, ia64, noarch, x86_64 3. ========================================================================== Kernel Live Patch Security Notice LSN-0021-1 April 10, 2017 linux vulnerability ========================================================================== A security issue affects these releases of Ubuntu: | Series | Base kernel | Arch | flavors | |------------------+--------------+----------+------------------| | Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency | Summary: Several security issues were fixed in the kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-6074) It was discovered that a race condition existed in the memory manager of the Linux kernel when handling copy-on-write breakage of private read-only memory mappings. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2016-7916) Qidan He discovered that the ICMP implementation in the Linux kernel did not properly check the size of an ICMP header. A local attacker with CAP_NET_ADMIN could use this to expose sensitive information. (CVE-2016-8399) It was discovered that the KVM implementation for x86/x86_64 in the Linux kernel could dereference a null pointer. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the KVM host. (CVE-2016-8630) Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation in the Linux kernel contained a buffer overflow when handling fragmented packets. A remote attacker could use this to possibly execute arbitrary code with administrative privileges. (CVE-2016-8633) CAI Qian discovered that the sysctl implementation in the Linux kernel did not properly perform reference counting in some situations. An unprivileged attacker could use this to cause a denial of service (system hang). (CVE-2016-9191) Andrey Konovalov discovered that the SCTP implementation in the Linux kernel improperly handled validation of incoming data. A remote attacker could use this to cause a denial of service (system crash). (CVE-2016-9555) Dmitry Vyukov discovered that the KVM implementation in the Linux kernel did not properly initialize the Code Segment (CS) in certain error cases. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2016-9756) Andy Lutomirski and Willy Tarreau discovered that the KVM implementation in the Linux kernel did not properly emulate instructions on the SS segment register. A local attacker in a guest virtual machine could use this to cause a denial of service (guest OS crash) or possibly gain administrative privileges in the guest OS. (CVE-2017-2583) Update instructions: The problem can be corrected by updating your livepatches to the following versions: | Kernel | Version | flavors | |-----------------+----------+--------------------------| | 4.4.0-21.37 | 16.1 | generic, lowlatency | | 4.4.0-21.37 | 17.1 | generic, lowlatency | | 4.4.0-21.37 | 18.1 | generic, lowlatency | | 4.4.0-21.37 | 21.1 | generic, lowlatency | | 4.4.0-22.39 | 13.2 | generic, lowlatency | | 4.4.0-22.39 | 16.1 | generic, lowlatency | | 4.4.0-22.39 | 17.1 | generic, lowlatency | | 4.4.0-22.39 | 18.1 | generic, lowlatency | | 4.4.0-22.39 | 21.1 | generic, lowlatency | | 4.4.0-22.40 | 16.1 | generic, lowlatency | | 4.4.0-22.40 | 17.1 | generic, lowlatency | | 4.4.0-22.40 | 18.1 | generic, lowlatency | | 4.4.0-22.40 | 21.1 | generic, lowlatency | | 4.4.0-24.43 | 16.1 | generic, lowlatency | | 4.4.0-24.43 | 17.1 | generic, lowlatency | | 4.4.0-24.43 | 18.1 | generic, lowlatency | | 4.4.0-24.43 | 21.1 | generic, lowlatency | | 4.4.0-28.47 | 16.1 | generic, lowlatency | | 4.4.0-28.47 | 17.1 | generic, lowlatency | | 4.4.0-28.47 | 18.1 | generic, lowlatency | | 4.4.0-28.47 | 21.1 | generic, lowlatency | | 4.4.0-31.50 | 16.1 | generic, lowlatency | | 4.4.0-31.50 | 17.1 | generic, lowlatency | | 4.4.0-31.50 | 18.1 | generic, lowlatency | | 4.4.0-31.50 | 21.1 | generic, lowlatency | | 4.4.0-34.53 | 16.1 | generic, lowlatency | | 4.4.0-34.53 | 17.1 | generic, lowlatency | | 4.4.0-34.53 | 18.1 | generic, lowlatency | | 4.4.0-34.53 | 21.1 | generic, lowlatency | | 4.4.0-36.55 | 16.1 | generic, lowlatency | | 4.4.0-36.55 | 17.1 | generic, lowlatency | | 4.4.0-36.55 | 18.1 | generic, lowlatency | | 4.4.0-36.55 | 21.1 | generic, lowlatency | | 4.4.0-38.57 | 16.1 | generic, lowlatency | | 4.4.0-38.57 | 17.1 | generic, lowlatency | | 4.4.0-38.57 | 18.1 | generic, lowlatency | | 4.4.0-38.57 | 21.1 | generic, lowlatency | | 4.4.0-42.62 | 16.1 | generic, lowlatency | | 4.4.0-42.62 | 17.1 | generic, lowlatency | | 4.4.0-42.62 | 18.1 | generic, lowlatency | | 4.4.0-42.62 | 21.1 | generic, lowlatency | | 4.4.0-43.63 | 16.1 | generic, lowlatency | | 4.4.0-43.63 | 17.1 | generic, lowlatency | | 4.4.0-43.63 | 18.1 | generic, lowlatency | | 4.4.0-43.63 | 21.1 | generic, lowlatency | | 4.4.0-45.66 | 16.1 | generic, lowlatency | | 4.4.0-45.66 | 17.1 | generic, lowlatency | | 4.4.0-45.66 | 18.1 | generic, lowlatency | | 4.4.0-45.66 | 21.1 | generic, lowlatency | | 4.4.0-47.68 | 16.1 | generic, lowlatency | | 4.4.0-47.68 | 17.1 | generic, lowlatency | | 4.4.0-47.68 | 18.1 | generic, lowlatency | | 4.4.0-47.68 | 21.1 | generic, lowlatency | | 4.4.0-51.72 | 16.1 | generic, lowlatency | | 4.4.0-51.72 | 17.1 | generic, lowlatency | | 4.4.0-51.72 | 18.1 | generic, lowlatency | | 4.4.0-51.72 | 21.1 | generic, lowlatency | | 4.4.0-53.74 | 16.1 | generic, lowlatency | | 4.4.0-53.74 | 17.1 | generic, lowlatency | | 4.4.0-53.74 | 18.1 | generic, lowlatency | | 4.4.0-53.74 | 21.1 | generic, lowlatency | | 4.4.0-57.78 | 17.1 | generic, lowlatency | | 4.4.0-57.78 | 18.1 | generic, lowlatency | | 4.4.0-57.78 | 21.1 | generic, lowlatency | | 4.4.0-59.80 | 17.1 | generic, lowlatency | | 4.4.0-59.80 | 18.1 | generic, lowlatency | | 4.4.0-59.80 | 21.1 | generic, lowlatency | | 4.4.0-62.83 | 17.1 | generic, lowlatency | | 4.4.0-62.83 | 18.1 | generic, lowlatency | | 4.4.0-62.83 | 21.1 | generic, lowlatency | | 4.4.0-63.84 | 18.1 | generic, lowlatency | | 4.4.0-63.84 | 21.1 | generic, lowlatency | | 4.4.0-64.85 | 21.1 | generic, lowlatency | | 4.4.0-66.87 | 21.1 | generic, lowlatency | | 4.4.0-67.88 | 21.1 | generic, lowlatency | | 4.4.0-70.91 | 21.1 | generic, lowlatency | | 4.4.0-71.92 | 21.1 | generic, lowlatency | Additionally, you should install an updated kernel with these fixes and reboot at your convienience. References: CVE-2016-5195, CVE-2016-7910, CVE-2016-7911, CVE-2016-7912, CVE-2016-7916, CVE-2016-8399, CVE-2016-8630, CVE-2016-8633, CVE-2016-9191, CVE-2016-9555, CVE-2016-9756, CVE-2017-2583, CVE-2017-6074, CVE-2017-7308

AFFECTED PRODUCTS