ID

VAR-201809-0668

CVE

CVE-2018-14634

TITLE

Linux Kernel Integer overflow vulnerability

DESCRIPTION

An integer overflow flaw was found in the Linux kernel's create_elf_tables() function. An unprivileged local user with access to SUID (or otherwise privileged) binary could use this flaw to escalate their privileges on the system. Kernel versions 2.6.x, 3.10.x and 4.14.x are believed to be vulnerable. Linux Kernel Contains an integer overflow vulnerability.Information is obtained, information is altered, and service operation is disrupted (DoS) There is a possibility of being put into a state. Linux kernel is prone to a local integer-overflow vulnerability. Attackers can exploit this issue to execute arbitrary code in the context of the affected application. Failed exploit attempts will likely cause a denial-of-service condition. 6.4) - x86_64 3. 6.7) - i386, ppc64, s390x, x86_64 3. Bug Fix(es): * Previously, the kernel source code lacked support to report the Speculative Store Bypass Disable (SSBD) vulnerability status on IBM Power Systems. As a consequence, the /sys/devices/system/cpu/vulnerabilities/spec_store_bypass file incorrectly reported "Not affected". This fix updates the kernel source code to properly report the SSBD status either as "Vulnerable" or "Mitigation: Kernel entry/exit barrier (TYPE)", where TYPE is one of "eieio", "hwsync", "fallback", or "unknown". (BZ#1615873) * After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the "__max_smt_threads()" function has been fixed. (BZ#1629634) 4. Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-862.14.3 source tree, which provides a number of bug fixes over the previous version. (BZ#1616429) * Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1617941) 4. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:3590-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:3590 Issue date: 2018-11-13 CVE Names: CVE-2017-18344 CVE-2018-5391 CVE-2018-10675 CVE-2018-14634 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions. 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 Server AUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server E4S (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64 3. Security Fix(es): * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391) * kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344) * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675) * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634. Bug Fix(es): * Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT) support. This update extends the array of mitigation states to cover all the states, which effectively prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that might be erroneously provided by the userspace. As a result, the kernel no longer panics in the described scenario. (BZ#1629565) * Previously, a packet was missing the User Datagram Protocol (UDP) payload checksum during a full checksum computation, if the hardware checksum was not applied. As a consequence, a packet with an incorrect checksum was dropped by a peer. With this update, the kernel includes the UDP payload checksum during the full checksum computation. As a result, the checksum is computed correctly and the packet can be received by the peer. (BZ#1635792) * Previously, a transform lookup through the xfrm framework could be performed on an already transformed destination cache entry (dst_entry). When using User Datagram Protocol (UDP) over IPv6 with a connected socket in conjunction with Internet Protocol Security (IPsec) in Encapsulating Security Payload (ESP) transport mode. As a consequence, invalid IPv6 fragments transmitted from the host or the kernel occasionally terminated unexpectedly due to a socket buffer (SKB) underrun. With this update, the xfrm lookup on an already transformed dst_entry is not possible. As a result, using UDP iperf utility over IPv6 ESP no longer causes invalid IPv6 fragment transmissions or a kernel panic. (BZ#1639586) 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/): 1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact 1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack) 1610958 - CVE-2017-18344 kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c 1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function 6. Package List: Red Hat Enterprise Linux Server AUS (v. 7.2): Source: kernel-3.10.0-327.76.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.76.1.el7.noarch.rpm kernel-doc-3.10.0-327.76.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-headers-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.76.1.el7.x86_64.rpm perf-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm Red Hat Enterprise Linux Server E4S (v. 7.2): Source: kernel-3.10.0-327.76.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.76.1.el7.noarch.rpm kernel-doc-3.10.0-327.76.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-headers-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.76.1.el7.x86_64.rpm perf-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 7.2): Source: kernel-3.10.0-327.76.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.76.1.el7.noarch.rpm kernel-doc-3.10.0-327.76.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-devel-3.10.0-327.76.1.el7.x86_64.rpm kernel-headers-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.76.1.el7.x86_64.rpm perf-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional E4S (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.76.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.76.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.76.1.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. References: https://access.redhat.com/security/cve/CVE-2017-18344 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/cve/CVE-2018-14634 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/articles/3553061 https://access.redhat.com/security/vulnerabilities/mutagen-astronomy 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW+sPDtzjgjWX9erEAQhm3BAAhxwzb8zJTfl0zFY/r9KUzkAdLXY4w39X BgJrVPyl7f6krvQ17HE95Poqz/iUhMOZAweypQXHMRKkmfMTYiLHlKpdIusou2xy y1ZzB1uloI4j2zMdTDRP5yZz06r/NP5A05pLZDA02iR5b07ALLYb5hcL5oBnpQXp 9Xp31qb7TCP+jWtCO1Ot+9GJ3chMNvpYqH0OkGTpq/G7PxGrhIzB6v4p6N5OntD9 5CIebREaGBWn9ViWiUHcthgg+PN2iS2/5ST82g/Jss/WmVVZSiVbayob6/MNQPnb M29VHOmJ6pf5dERNpSqrJrBXeDYCMA6HHD+RT9SmiuQQ8gQ2Rzjy7K97Nn++6x7O nclOTmB7hQZtl0WhgC3xuwtslXGpe9jKSzql03ijTvJRQrczgVWiBS+tpfVAJprV ma2Kchf5ivctaXZ/R62JMyTvNf6HCVdvBNvSNET52ol3PkdpJK7V7mg+H64Mqdrl cBTUDBHHYYWMJted9pHWq7tPs0vy1h9aoFqNdlak5jwr169vldlZMRBbhtvz+OXj V/o+IClbY9UUfibaXDoX7qufeVikW1KQ4L+VhRj3RzXNsu2A8FUAcN7za5Qv5HIe LiC42C+pjvHqS/9gNpBakzKv6nPldWZIfPEuF4zewizBxlTXHPE1ln1hAWKjqVTs 6QJ1Zh7jeUY= =8JOQ -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . ========================================================================== Ubuntu Security Notice USN-3775-2 October 01, 2018 linux-lts-trusty vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM 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 14.04 LTS for Ubuntu 12.04 ESM. It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information. (CVE-2018-15594) It was discovered that microprocessors utilizing speculative execution and prediction of return addresses via Return Stack Buffer (RSB) may allow unauthorized memory reads via sidechannel attacks. An attacker could use this to expose sensitive information. A local attacker could use this to gain administrative privileges. (CVE-2018-14634) It was discovered that a stack-based buffer overflow existed in the iSCSI target implementation of the Linux kernel. A remote attacker could use this to cause a denial of service (system crash). (CVE-2018-14633) It was discovered that a memory leak existed in the IRDA subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2018-6555) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.13.0-160-generic 3.13.0-160.210~precise1 linux-image-3.13.0-160-generic-lpae 3.13.0-160.210~precise1 linux-image-generic-lpae-lts-trusty 3.13.0.160.150 linux-image-generic-lts-trusty 3.13.0.160.150 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

AFFECTED PRODUCTS