[SECURITY] [DSA 4465-1] linux security update

From: Salvatore Bonaccorso <carnil@debian.org>
To: bugtraq@securityfocus.com
Cc:
Subject: [SECURITY] [DSA 4465-1] linux security update
Date:


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Debian Security Advisory DSA-4465-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
June 17, 2019                         https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2019-3846 CVE-2019-5489 CVE-2019-9500 CVE-2019-9503
                 CVE-2019-10126 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479
                 CVE-2019-11486 CVE-2019-11599 CVE-2019-11815 CVE-2019-11833
                 CVE-2019-11884
Debian Bug     : 928989

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

CVE-2019-3846, CVE-2019-10126

    huangwen reported multiple buffer overflows in the Marvell wifi
    (mwifiex) driver, which a local user could use to cause denial of
    service or the execution of arbitrary code.

CVE-2019-5489

    Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari
    Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh
    discovered that local users could use the mincore() system call to
    obtain sensitive information from other processes that access the
    same memory-mapped file.

CVE-2019-9500, CVE-2019-9503

    Hugues Anguelkov discovered a buffer overflow and missing access
    validation in the Broadcom FullMAC wifi driver (brcmfmac), which a
    attacker on the same wifi network could use to cause denial of
    service or the execution of arbitrary code.

CVE-2019-11477

    Jonathan Looney reported that a specially crafted sequence of TCP
    selective acknowledgements (SACKs) allows a remotely triggerable
    kernel panic.

CVE-2019-11478

    Jonathan Looney reported that a specially crafted sequence of TCP
    selective acknowledgements (SACKs) will fragment the TCP
    retransmission queue, allowing an attacker to cause excessive
    resource usage.

CVE-2019-11479

    Jonathan Looney reported that an attacker could force the Linux
    kernel to segment its responses into multiple TCP segments, each of
    which contains only 8 bytes of data, drastically increasing the
    bandwidth required to deliver the same amount of data.

    This update introduces a new sysctl value to control the minimal MSS
    (net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-
    coded value of 48.  We recommend raising this to 536 unless you know
    that your network requires a lower value.

CVE-2019-11486

    Jann Horn of Google reported numerous race conditions in the
    Siemens R3964 line discipline. A local user could use these to
    cause unspecified security impact. This module has therefore been
    disabled.

CVE-2019-11599

    Jann Horn of Google reported a race condition in the core dump
    implementation which could lead to a use-after-free.  A local
    user could use this to read sensitive information, to cause a
    denial of service (memory corruption), or for privilege
    escalation.

CVE-2019-11815

    It was discovered that a use-after-free in the Reliable Datagram
    Sockets protocol could result in denial of service and potentially
    privilege escalation.  This protocol module (rds) is not auto-
    loaded on Debian systems, so this issue only affects systems where
    it is explicitly loaded.

CVE-2019-11833

    It was discovered that the ext4 filesystem implementation writes
    uninitialised data from kernel memory to new extent blocks.  A
    local user able to write to an ext4 filesystem and then read the
    filesystem image, for example using a removable drive, might be
    able to use this to obtain sensitive information.

CVE-2019-11884

    It was discovered that the Bluetooth HIDP implementation did not
    ensure that new connection names were null-terminated.  A local
    user with CAP_NET_ADMIN capability might be able to use this to
    obtain sensitive information from the kernel stack.

For the stable distribution (stretch), these problems have been fixed in
version 4.9.168-1+deb9u3.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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