ID

VAR-201704-1397

CVE

CVE-2017-7895

TITLE

Linux kernel NFSv2 and NFSv3 Server security vulnerability

DESCRIPTION

The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lack certain checks for the end of a buffer, which allows remote attackers to trigger pointer-arithmetic errors or possibly have unspecified other impact via crafted requests, related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. Linux Kernel is prone to multiple security-bypass vulnerabilities. Attackers can exploit these issues to bypass certain security restrictions and perform unauthorized actions. This may aid in further attacks. 6.6) - noarch, x86_64 3. 6.2) - x86_64 3. On systems with the stack protection feature enabled in the kernel (CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other than s390x and ppc64[le]), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to crash the system. Due to the nature of the stack protection feature, code execution cannot be fully ruled out, although we believe it is unlikely. Bug Fix(es): * Previously, while the MAP_GROWSDOWN flag was set, writing to the memory which was mapped with the mmap system call failed with the SIGBUS signal. This update fixes memory management in the Linux kernel by backporting an upstream patch that enlarges the stack guard page gap. As a result, mmap now works as expected under the described circumstances. (BZ#1474720) 4. =========================================================================== Ubuntu Security Notice USN-3312-2 June 07, 2017 linux-lts-xenial vulnerabilities =========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the Linux kernel. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that the netfilter netlink implementation in the Linux kernel did not properly validate batch messages. A local attacker with the CAP_NET_ADMIN capability could use this to expose sensitive information or cause a denial of service. (CVE-2016-7917) Qian Zhang discovered a heap-based buffer overflow in the tipc_msg_build() function in the Linux kernel. A local attacker could use to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges. (CVE-2016-8632) It was discovered that the keyring implementation in the Linux kernel in some situations did not prevent special internal keyrings from being joined by userspace keyrings. A privileged local attacker could use this to bypass module verification. (CVE-2016-9604) It was discovered that a buffer overflow existed in the trace subsystem in the Linux kernel. A privileged local attacker could use this to execute arbitrary code. (CVE-2017-0605) Dmitry Vyukov discovered that KVM implementation in the Linux kernel improperly emulated the VMXON instruction. A local attacker in a guest OS could use this to cause a denial of service (memory consumption) in the host OS. (CVE-2017-2596) Daniel Jiang discovered that a race condition existed in the ipv4 ping socket implementation in the Linux kernel. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2017-2671) Di Shen discovered that a race condition existed in the perf subsystem of the Linux kernel. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2017-6001) Eric Biggers discovered a memory leak in the keyring implementation in the Linux kernel. A local attacker could use this to cause a denial of service (memory consumption). (CVE-2017-7472) Sabrina Dubroca discovered that the asynchronous cryptographic hash (ahash) implementation in the Linux kernel did not properly handle a full request queue. A local attacker could use this to cause a denial of service (infinite recursion). (CVE-2017-7618) Tuomas Haanp=E4=E4 and Ari Kauppi discovered that the NFSv2 and NFSv3 server implementations in the Linux kernel did not properly handle certain long RPC replies. A remote attacker could use this to cause a denial of service (system crash). (CVE-2017-7645) Tommi Rantala and Brad Spengler discovered that the memory manager in the Linux kernel did not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism. A local attacker with access to /dev/mem could use this to expose sensitive information or possibly execute arbitrary code. A remote attacker could use this to craft requests that cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-7895) It was discovered that a use-after-free vulnerability existed in the device driver for XCeive xc2028/xc3028 tuners in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-7913) Vlad Tsyrklevich discovered an integer overflow vulnerability in the VFIO PCI driver for the Linux kernel. A local attacker with access to a vfio PCI device file could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-9083, CVE-2016-9084) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-4.4.0-79-generic 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-generic-lpae 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-lowlatency 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-powerpc-e500mc 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-powerpc-smp 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-powerpc64-emb 4.4.0-79.100~14.04.1 linux-image-4.4.0-79-powerpc64-smp 4.4.0-79.100~14.04.1 linux-image-generic-lpae-lts-xenial 4.4.0.79.64 linux-image-generic-lts-xenial 4.4.0.79.64 linux-image-lowlatency-lts-xenial 4.4.0.79.64 linux-image-powerpc-e500mc-lts-xenial 4.4.0.79.64 linux-image-powerpc-smp-lts-xenial 4.4.0.79.64 linux-image-powerpc64-emb-lts-xenial 4.4.0.79.64 linux-image-powerpc64-smp-lts-xenial 4.4.0.79.64 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. References: https://www.ubuntu.com/usn/usn-3312-2 https://www.ubuntu.com/usn/usn-3312-1 CVE-2016-7913, CVE-2016-7917, CVE-2016-8632, CVE-2016-9083, CVE-2016-9084, CVE-2016-9604, CVE-2017-0605, CVE-2017-2596, CVE-2017-2671, CVE-2017-6001, CVE-2017-7472, CVE-2017-7618, CVE-2017-7645, CVE-2017-7889, CVE-2017-7895 Package Information: https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-79.100~14.04.1 . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:2429-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:2429 Issue date: 2017-08-08 CVE Names: CVE-2017-7895 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.7 Extended Update Support. 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 HPC Node EUS (v. 6.7) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) - x86_64 Red Hat Enterprise Linux Server EUS (v. 6.7) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 6.7) - i386, ppc64, s390x, x86_64 3. (CVE-2017-7895, Important) Red Hat would like to thank Ari Kauppi for reporting this issue. Bug Fix(es): * If a VFC port became unmapped in the VIOS, it sometimes did not respond with a CRQ init complete following the H_REG_CRQ() call. As a consequence, scsi_block_requests were called until the init complete occurred. If not, I/O requests were hung. The provided patch ensures the host action stays set to IBMVFC_HOST_ACTION_TGT_DEL so that all rports are moved into devloss state unless an init complete is received. (BZ#1460210) 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. Package List: Red Hat Enterprise Linux HPC Node EUS (v. 6.7): Source: kernel-2.6.32-573.45.1.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-573.45.1.el6.noarch.rpm kernel-doc-2.6.32-573.45.1.el6.noarch.rpm kernel-firmware-2.6.32-573.45.1.el6.noarch.rpm x86_64: kernel-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.45.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.45.1.el6.x86_64.rpm kernel-devel-2.6.32-573.45.1.el6.x86_64.rpm kernel-headers-2.6.32-573.45.1.el6.x86_64.rpm perf-2.6.32-573.45.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7): x86_64: kernel-debug-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.45.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm python-perf-2.6.32-573.45.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 6.7): Source: kernel-2.6.32-573.45.1.el6.src.rpm i386: kernel-2.6.32-573.45.1.el6.i686.rpm kernel-debug-2.6.32-573.45.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.45.1.el6.i686.rpm kernel-devel-2.6.32-573.45.1.el6.i686.rpm kernel-headers-2.6.32-573.45.1.el6.i686.rpm perf-2.6.32-573.45.1.el6.i686.rpm perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm noarch: kernel-abi-whitelists-2.6.32-573.45.1.el6.noarch.rpm kernel-doc-2.6.32-573.45.1.el6.noarch.rpm kernel-firmware-2.6.32-573.45.1.el6.noarch.rpm ppc64: kernel-2.6.32-573.45.1.el6.ppc64.rpm kernel-bootwrapper-2.6.32-573.45.1.el6.ppc64.rpm kernel-debug-2.6.32-573.45.1.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm kernel-debug-devel-2.6.32-573.45.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-573.45.1.el6.ppc64.rpm kernel-devel-2.6.32-573.45.1.el6.ppc64.rpm kernel-headers-2.6.32-573.45.1.el6.ppc64.rpm perf-2.6.32-573.45.1.el6.ppc64.rpm perf-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm s390x: kernel-2.6.32-573.45.1.el6.s390x.rpm kernel-debug-2.6.32-573.45.1.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.s390x.rpm kernel-debug-devel-2.6.32-573.45.1.el6.s390x.rpm kernel-debuginfo-2.6.32-573.45.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-573.45.1.el6.s390x.rpm kernel-devel-2.6.32-573.45.1.el6.s390x.rpm kernel-headers-2.6.32-573.45.1.el6.s390x.rpm kernel-kdump-2.6.32-573.45.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-573.45.1.el6.s390x.rpm kernel-kdump-devel-2.6.32-573.45.1.el6.s390x.rpm perf-2.6.32-573.45.1.el6.s390x.rpm perf-debuginfo-2.6.32-573.45.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.s390x.rpm x86_64: kernel-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debug-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-573.45.1.el6.i686.rpm kernel-debug-devel-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-573.45.1.el6.x86_64.rpm kernel-devel-2.6.32-573.45.1.el6.x86_64.rpm kernel-headers-2.6.32-573.45.1.el6.x86_64.rpm perf-2.6.32-573.45.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 6.7): i386: kernel-debug-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-2.6.32-573.45.1.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-573.45.1.el6.i686.rpm perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm python-perf-2.6.32-573.45.1.el6.i686.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.i686.rpm ppc64: kernel-debug-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-573.45.1.el6.ppc64.rpm perf-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm python-perf-2.6.32-573.45.1.el6.ppc64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.ppc64.rpm s390x: kernel-debug-debuginfo-2.6.32-573.45.1.el6.s390x.rpm kernel-debuginfo-2.6.32-573.45.1.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-573.45.1.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-573.45.1.el6.s390x.rpm perf-debuginfo-2.6.32-573.45.1.el6.s390x.rpm python-perf-2.6.32-573.45.1.el6.s390x.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.s390x.rpm x86_64: kernel-debug-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-573.45.1.el6.x86_64.rpm perf-debuginfo-2.6.32-573.45.1.el6.x86_64.rpm python-perf-2.6.32-573.45.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-573.45.1.el6.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 2017 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZiZt5XlSAg2UNWIIRAg6DAJ0WsJ0lj2sQh8HNKoSgZypObfa5tQCdGS79 1RjgNxPGb2RchahUwhBJBk4= =AxFU -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . Relevant releases/architectures: MRG Realtime for RHEL 6 Server v.2 - 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. Security Fix(es): * A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. (CVE-2017-1000364, Important) * The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. (CVE-2017-7895, Important) * A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a condition in which it could loop indefinitely. Bug Fix(es): * kernel-rt packages have been upgraded to the 3.10.0-514 source tree, which provides a number of bug fixes over the previous version. (BZ#1452745) 4. Bug Fix(es): * When upgrading to kernel with the fix for stack guard flaw, a crash could occur in Java Virtual Machine (JVM) environments, which attempted to implement their own stack guard page. With this update, the underlying source code has been fixed to consider the PROT_NONE mapping as a part of the stack, and the crash in JVM no longer occurs under the described circumstances. (BZ#1466815) 4

AFFECTED PRODUCTS