[RHSA-2016:1141-01] Moderate: ntp security update

Fabricante: RedHat
Fecha: 31/05/2016
Identificador: RHSA-2016:1141-01
[RHSA-2016:1141-01] Moderate: ntp security update
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: ntp security update Advisory ID: RHSA-2016:1141-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2016:1141 Issue date: 2016-05-31 CVE Names: CVE-2015-7979 CVE-2016-1547 CVE-2016-1548 CVE-2016-1550 CVE-2016-2518 ===================================================================== 1. Summary: An update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. 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 Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64 3. Description: The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time source. These packages include the ntpd service which continuously adjusts system time and utilities used to query and configure the ntpd service. Security Fix(es): * It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time. (CVE-2015-7979) * A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time. (CVE-2016-1547) * It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548) * A flaw was found in the way NTP's libntp performed message authentication. An attacker able to observe the timing of the comparison function used in packet authentication could potentially use this flaw to recover the message digest. (CVE-2016-1550) * An out-of-bounds access flaw was found in the way ntpd processed certain packets. An authenticated attacker could use a crafted packet to create a peer association with hmode of 7 and larger, which could potentially (although highly unlikely) cause ntpd to crash. (CVE-2016-2518) The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat). 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 5. Bugs fixed (https://bugzilla.redhat.com/): 1300271 - CVE-2015-7979 ntp: off-path denial of service on authenticated broadcast mode 1331461 - CVE-2016-1547 ntp: crypto-NAK preemptable association denial of service 1331462 - CVE-2016-1548 ntp: ntpd switching to interleaved mode with spoofed packets 1331464 - CVE-2016-1550 ntp: libntp message digest disclosure 1331468 - CVE-2016-2518 ntp: out-of-bounds references on crafted packet 6. Package List: Red Hat Enterprise Linux Desktop (v. 6): Source: ntp-4.2.6p5-10.el6.1.src.rpm i386: ntp-4.2.6p5-10.el6.1.i686.rpm ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntpdate-4.2.6p5-10.el6.1.i686.rpm x86_64: ntp-4.2.6p5-10.el6.1.x86_64.rpm ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntpdate-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Desktop Optional (v. 6): i386: ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntp-perl-4.2.6p5-10.el6.1.i686.rpm noarch: ntp-doc-4.2.6p5-10.el6.1.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntp-perl-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux HPC Node (v. 6): Source: ntp-4.2.6p5-10.el6.1.src.rpm x86_64: ntp-4.2.6p5-10.el6.1.x86_64.rpm ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntpdate-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux HPC Node Optional (v. 6): noarch: ntp-doc-4.2.6p5-10.el6.1.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntp-perl-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Server (v. 6): Source: ntp-4.2.6p5-10.el6.1.src.rpm i386: ntp-4.2.6p5-10.el6.1.i686.rpm ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntpdate-4.2.6p5-10.el6.1.i686.rpm ppc64: ntp-4.2.6p5-10.el6.1.ppc64.rpm ntp-debuginfo-4.2.6p5-10.el6.1.ppc64.rpm ntpdate-4.2.6p5-10.el6.1.ppc64.rpm s390x: ntp-4.2.6p5-10.el6.1.s390x.rpm ntp-debuginfo-4.2.6p5-10.el6.1.s390x.rpm ntpdate-4.2.6p5-10.el6.1.s390x.rpm x86_64: ntp-4.2.6p5-10.el6.1.x86_64.rpm ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntpdate-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 6): i386: ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntp-perl-4.2.6p5-10.el6.1.i686.rpm noarch: ntp-doc-4.2.6p5-10.el6.1.noarch.rpm ppc64: ntp-debuginfo-4.2.6p5-10.el6.1.ppc64.rpm ntp-perl-4.2.6p5-10.el6.1.ppc64.rpm s390x: ntp-debuginfo-4.2.6p5-10.el6.1.s390x.rpm ntp-perl-4.2.6p5-10.el6.1.s390x.rpm x86_64: ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntp-perl-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 6): Source: ntp-4.2.6p5-10.el6.1.src.rpm i386: ntp-4.2.6p5-10.el6.1.i686.rpm ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntpdate-4.2.6p5-10.el6.1.i686.rpm x86_64: ntp-4.2.6p5-10.el6.1.x86_64.rpm ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntpdate-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 6): i386: ntp-debuginfo-4.2.6p5-10.el6.1.i686.rpm ntp-perl-4.2.6p5-10.el6.1.i686.rpm noarch: ntp-doc-4.2.6p5-10.el6.1.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-10.el6.1.x86_64.rpm ntp-perl-4.2.6p5-10.el6.1.x86_64.rpm Red Hat Enterprise Linux Client (v. 7): Source: ntp-4.2.6p5-22.el7_2.2.src.rpm x86_64: ntp-4.2.6p5-22.el7_2.2.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm ntpdate-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7_2.2.noarch.rpm ntp-perl-4.2.6p5-22.el7_2.2.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm sntp-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: ntp-4.2.6p5-22.el7_2.2.src.rpm x86_64: ntp-4.2.6p5-22.el7_2.2.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm ntpdate-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7_2.2.noarch.rpm ntp-perl-4.2.6p5-22.el7_2.2.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm sntp-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: ntp-4.2.6p5-22.el7_2.2.src.rpm ppc64: ntp-4.2.6p5-22.el7_2.2.ppc64.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64.rpm ntpdate-4.2.6p5-22.el7_2.2.ppc64.rpm ppc64le: ntp-4.2.6p5-22.el7_2.2.ppc64le.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64le.rpm ntpdate-4.2.6p5-22.el7_2.2.ppc64le.rpm s390x: ntp-4.2.6p5-22.el7_2.2.s390x.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.s390x.rpm ntpdate-4.2.6p5-22.el7_2.2.s390x.rpm x86_64: ntp-4.2.6p5-22.el7_2.2.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm ntpdate-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7_2.2.noarch.rpm ntp-perl-4.2.6p5-22.el7_2.2.noarch.rpm ppc64: ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64.rpm sntp-4.2.6p5-22.el7_2.2.ppc64.rpm ppc64le: ntp-debuginfo-4.2.6p5-22.el7_2.2.ppc64le.rpm sntp-4.2.6p5-22.el7_2.2.ppc64le.rpm s390x: ntp-debuginfo-4.2.6p5-22.el7_2.2.s390x.rpm sntp-4.2.6p5-22.el7_2.2.s390x.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm sntp-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: ntp-4.2.6p5-22.el7_2.2.src.rpm x86_64: ntp-4.2.6p5-22.el7_2.2.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm ntpdate-4.2.6p5-22.el7_2.2.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7_2.2.noarch.rpm ntp-perl-4.2.6p5-22.el7_2.2.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7_2.2.x86_64.rpm sntp-4.2.6p5-22.el7_2.2.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-2015-7979 https://access.redhat.com/security/cve/CVE-2016-1547 https://access.redhat.com/security/cve/CVE-2016-1548 https://access.redhat.com/security/cve/CVE-2016-1550 https://access.redhat.com/security/cve/CVE-2016-2518 https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFXTUp2XlSAg2UNWIIRAqUmAKC32P98McZUqU1gzWxBbCz0hn0eagCfRtrx SULnKXrtTJd5iJ6eQVtDnxA= =hETy -----END PGP SIGNATURE-----