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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2885 Moderate: ntp security, bug fix, and enhancement update 23 November 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ntp Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 7 Red Hat Enterprise Linux WS/Desktop 7 Impact/Access: Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote with User Interaction Reduced Security -- Remote/Unauthenticated Unauthorised Access -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-3405 CVE-2015-1799 CVE-2015-1798 CVE-2014-9751 CVE-2014-9750 CVE-2014-9298 CVE-2014-9297 Reference: ESB-2015.1921 ESB-2015.0288.2 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2015-2231.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: ntp security, bug fix, and enhancement update Advisory ID: RHSA-2015:2231-04 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2231.html Issue date: 2015-11-19 CVE Names: CVE-2014-9297 CVE-2014-9298 CVE-2014-9750 CVE-2014-9751 CVE-2015-1798 CVE-2015-1799 CVE-2015-3405 ===================================================================== 1. Summary: Updated ntp packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links 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 Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - 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. It was found that because NTP's access control was based on a source IP address, an attacker could bypass source IP restrictions and send malicious control and configuration packets by spoofing ::1 addresses. (CVE-2014-9298, CVE-2014-9751) A denial of service flaw was found in the way NTP hosts that were peering with each other authenticated themselves before updating their internal state variables. An attacker could send packets to one peer host, which could cascade to other peers, and stop the synchronization process among the reached peers. (CVE-2015-1799) A flaw was found in the way the ntp-keygen utility generated MD5 symmetric keys on big-endian systems. An attacker could possibly use this flaw to guess generated MD5 keys, which could then be used to spoof an NTP client or server. (CVE-2015-3405) A stack-based buffer overflow was found in the way the NTP autokey protocol was implemented. When an NTP client decrypted a secret received from an NTP server, it could cause that client to crash. (CVE-2014-9297, CVE-2014-9750) It was found that ntpd did not check whether a Message Authentication Code (MAC) was present in a received packet when ntpd was configured to use symmetric cryptographic keys. A man-in-the-middle attacker could use this flaw to send crafted packets that would be accepted by a client or a peer without the attacker knowing the symmetric key. (CVE-2015-1798) The CVE-2015-1798 and CVE-2015-1799 issues were discovered by Miroslav Lichvár of Red Hat. Bug fixes: * The ntpd service truncated symmetric keys specified in the key file to 20 bytes. As a consequence, it was impossible to configure NTP authentication to work with peers that use longer keys. With this update, the maximum key length has been changed to 32 bytes. (BZ#1191111) * The ntpd service could previously join multicast groups only when starting, which caused problems if ntpd was started during system boot before network was configured. With this update, ntpd attempts to join multicast groups every time network configuration is changed. (BZ#1207014) * Previously, the ntp-keygen utility used the exponent of 3 when generating RSA keys. Consequently, generating RSA keys failed when FIPS mode was enabled. With this update, ntp-keygen has been modified to use the exponent of 65537, and generating keys in FIPS mode now works as expected. (BZ#1191116) * The ntpd service dropped incoming NTP packets if their source port was lower than 123 (the NTP port). With this update, ntpd no longer checks the source port number, and clients behind NAT are now able to correctly synchronize with the server. (BZ#1171640) Enhancements: * This update adds support for configurable Differentiated Services Code Points (DSCP) in NTP packets, simplifying configuration in large networks where different NTP implementations or versions are using different DSCP values. (BZ#1202828) * This update adds the ability to configure separate clock stepping thresholds for each direction (backward and forward). Use the "stepback" and "stepfwd" options to configure each threshold. (BZ#1193154) * Support for nanosecond resolution has been added to the Structural Health Monitoring (SHM) reference clock. Prior to this update, when a Precision Time Protocol (PTP) hardware clock was used as a time source to synchronize the system clock, the accuracy of the synchronization was limited due to the microsecond resolution of the SHM protocol. The nanosecond extension in the SHM protocol now allows sub-microsecond synchronization of the system clock. (BZ#1117702) All ntp users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1117702 - SHM refclock doesn't support nanosecond resolution 1122012 - SHM refclock allows only two units with owner-only access 1171640 - NTP drops requests when sourceport is below 123 1180721 - ntp: mreadvar command crash in ntpq 1184572 - CVE-2014-9298 CVE-2014-9751 ntp: drop packets with source address ::1 1184573 - CVE-2014-9297 CVE-2014-9750 ntp: vallen in extension fields are not validated 1191108 - ntpd should warn when monitoring facility can't be disabled due to restrict configuration 1191122 - ntpd -x steps clock on leap second 1193154 - permit differential fwd/back threshold for step vs. slew [PATCH] 1199430 - CVE-2015-1798 ntp: ntpd accepts unauthenticated packets with symmetric key crypto 1199435 - CVE-2015-1799 ntp: authentication doesn't protect symmetric associations against DoS attacks 1210324 - CVE-2015-3405 ntp: ntp-keygen may generate non-random symmetric keys on big-endian systems 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: ntp-4.2.6p5-22.el7.src.rpm x86_64: ntp-4.2.6p5-22.el7.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm ntpdate-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7.noarch.rpm ntp-perl-4.2.6p5-22.el7.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm sntp-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: ntp-4.2.6p5-22.el7.src.rpm x86_64: ntp-4.2.6p5-22.el7.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm ntpdate-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7.noarch.rpm ntp-perl-4.2.6p5-22.el7.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm sntp-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: ntp-4.2.6p5-22.el7.src.rpm aarch64: ntp-4.2.6p5-22.el7.aarch64.rpm ntp-debuginfo-4.2.6p5-22.el7.aarch64.rpm ntpdate-4.2.6p5-22.el7.aarch64.rpm ppc64: ntp-4.2.6p5-22.el7.ppc64.rpm ntp-debuginfo-4.2.6p5-22.el7.ppc64.rpm ntpdate-4.2.6p5-22.el7.ppc64.rpm ppc64le: ntp-4.2.6p5-22.el7.ppc64le.rpm ntp-debuginfo-4.2.6p5-22.el7.ppc64le.rpm ntpdate-4.2.6p5-22.el7.ppc64le.rpm s390x: ntp-4.2.6p5-22.el7.s390x.rpm ntp-debuginfo-4.2.6p5-22.el7.s390x.rpm ntpdate-4.2.6p5-22.el7.s390x.rpm x86_64: ntp-4.2.6p5-22.el7.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm ntpdate-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): aarch64: ntp-debuginfo-4.2.6p5-22.el7.aarch64.rpm sntp-4.2.6p5-22.el7.aarch64.rpm noarch: ntp-doc-4.2.6p5-22.el7.noarch.rpm ntp-perl-4.2.6p5-22.el7.noarch.rpm ppc64: ntp-debuginfo-4.2.6p5-22.el7.ppc64.rpm sntp-4.2.6p5-22.el7.ppc64.rpm ppc64le: ntp-debuginfo-4.2.6p5-22.el7.ppc64le.rpm sntp-4.2.6p5-22.el7.ppc64le.rpm s390x: ntp-debuginfo-4.2.6p5-22.el7.s390x.rpm sntp-4.2.6p5-22.el7.s390x.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm sntp-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: ntp-4.2.6p5-22.el7.src.rpm x86_64: ntp-4.2.6p5-22.el7.x86_64.rpm ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm ntpdate-4.2.6p5-22.el7.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): noarch: ntp-doc-4.2.6p5-22.el7.noarch.rpm ntp-perl-4.2.6p5-22.el7.noarch.rpm x86_64: ntp-debuginfo-4.2.6p5-22.el7.x86_64.rpm sntp-4.2.6p5-22.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-2014-9297 https://access.redhat.com/security/cve/CVE-2014-9298 https://access.redhat.com/security/cve/CVE-2014-9750 https://access.redhat.com/security/cve/CVE-2014-9751 https://access.redhat.com/security/cve/CVE-2015-1798 https://access.redhat.com/security/cve/CVE-2015-1799 https://access.redhat.com/security/cve/CVE-2015-3405 https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2015 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD4DBQFWTkFJXlSAg2UNWIIRAphzAKCRHDVdHI5OvJ8glkXYLBwyQgeyvwCYmTV3 1hLTu5I/PUzWOnD8rRIlZQ== =sWdG - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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