-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:2732-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:2732 Issue date: 2017-09-14 CVE Names: CVE-2017-1000251 CVE-2017-7895 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.2 Advanced 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 Server AUS (v. 6.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important) * A stack buffer overflow flaw was found in the way the Bluetooth subsystem of the Linux kernel processed pending L2CAP configuration responses from a client. 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. On systems without the stack protection feature (ppc64[le]; the Bluetooth modules are not built on s390x), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to remotely execute arbitrary code on the system with ring 0 (kernel) privileges. (CVE-2017-1000251, Important) Red Hat would like to thank Ari Kauppi for reporting CVE-2017-7895 and Armis Labs for reporting CVE-2017-1000251. 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. 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/): 1446103 - CVE-2017-7895 kernel: NFSv3 server does not properly handle payload bounds checking of WRITE requests 1489716 - CVE-2017-1000251 kernel: stack buffer overflow in the native Bluetooth stack 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.2): Source: kernel-2.6.32-220.75.1.el6.src.rpm noarch: kernel-doc-2.6.32-220.75.1.el6.noarch.rpm kernel-firmware-2.6.32-220.75.1.el6.noarch.rpm x86_64: kernel-2.6.32-220.75.1.el6.x86_64.rpm kernel-debug-2.6.32-220.75.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-220.75.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.75.1.el6.x86_64.rpm kernel-devel-2.6.32-220.75.1.el6.x86_64.rpm kernel-headers-2.6.32-220.75.1.el6.x86_64.rpm perf-2.6.32-220.75.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.2): Source: kernel-2.6.32-220.75.1.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.75.1.el6.x86_64.rpm perf-debuginfo-2.6.32-220.75.1.el6.x86_64.rpm python-perf-2.6.32-220.75.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.75.1.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. References: https://access.redhat.com/security/cve/CVE-2017-1000251 https://access.redhat.com/security/cve/CVE-2017-7895 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/CVE-2017-1000251 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZuotVXlSAg2UNWIIRApm5AJ4m9kJllDyGPxbLd3vCh6QirV+lYACgsA6+ gs07XbI8anuO31aUzF1ZHLU= =lFxT -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce