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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Oracle Issues Fix for Oracle Linux) ntp Multiple Flaws Let Remote Users Deny Service, View Files, and Bypass Authentication to Modify the Time
SecurityTracker Alert ID:  1034232
SecurityTracker URL:  http://securitytracker.com/id/1034232
CVE Reference:   CVE-2015-7704   (Links to External Site)
Date:  Nov 24 2015
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 4.2.8p4
Description:   Multiple vulnerabilities were reported in ntp. A remote user can view files on the target system. A remote user can cause denial of service conditions on the target system. A remote user can bypass authentication. A remote user can modify the time on the target system.

A remote user can trigger a memory leak in CRYPTO_ASSOC [CVE-2015-7701].

A remote user can send AutoKey messages with a specially crafted AutoKey data packet length value to cause denial of service conditions [CVE-2015-7691, CVE-2015-7692, CVE-2015-7702].

A remote user can overwrite "pidfile" and "driftfile" configuration file directives [CVE-2015-7703].

A remote user can supply specially crafted data to cause denial of service conditions [CVE-2015-7704, CVE-2015-7705].

A remote user can trigger a mode 7 loop counter integer overflow in ntpd [CVE-2015-7848].

A remote user can trigger a use-after-free memory error in the processing of trusted keys [CVE-2015-7849].

A remote user can exploit a logfile-keyfile configuration flaw to cause denial of service conditions [CVE-2015-7850].

A remote user can exploit a directory traversal flaw in ntpd saveconfig [CVE-2015-7851].

A remote user can trigger a memory corruption error in the ntpq atoascii() function [CVE-2015-7852].

A remote user can supply specially crafted reference clock data to trigger a buffer overflow [CVE-2015-7853].

A remote user can supply a specially crafted password value to trigger a memory corruption error [CVE-2015-7854].

A remote user can send a specially crafted control packet message to exploit a flaw in decodenetnum() to cause denial of service conditions [CVE-2015-7855].

A remote user can exploit a flaw in the crypto-NAK() function to bypass symmetric association authentication [CVE-2015-7871].

Cisco ASIG, IDA, Cisco TALOS, Tenable, RedHat, OpenVMS, and Boston University reported these vulnerabilities.

Impact:   A remote user can modify time on the target system.

A remote user can view files on the target system.

A remote user can cause denial of service conditions.

A remote user can bypass authentication on the target system.

Solution:   Oracle has issued a fix for CVE-2015-7704.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2015-2231.html

Vendor URL:  linux.oracle.com/errata/ELSA-2015-2231.html (Links to External Site)
Cause:   Access control error, Boundary error, Input validation error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Oct 23 2015 ntp Multiple Flaws Let Remote Users Deny Service, View Files, and Bypass Authentication to Modify the Time



 Source Message Contents

Subject:  [El-errata] ELSA-2015-2231 Moderate: Oracle Linux 7 ntp security, bug fix, and enhancement update

Oracle Linux Security Advisory ELSA-2015-2231

http://linux.oracle.com/errata/ELSA-2015-2231.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
ntp-4.2.6p5-22.el7.x86_64.rpm
ntp-doc-4.2.6p5-22.el7.noarch.rpm
ntp-perl-4.2.6p5-22.el7.noarch.rpm
ntpdate-4.2.6p5-22.el7.x86_64.rpm
sntp-4.2.6p5-22.el7.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/ntp-4.2.6p5-22.el7.src.rpm



Description of changes:

[4.2.6p5-22]
- check origin timestamp before accepting KoD RATE packet (CVE-2015-7704)
- allow only one step larger than panic threshold with -g (CVE-2015-5300)

[4.2.6p5-20]
- validate lengths of values in extension fields (CVE-2014-9297)
- drop packets with spoofed source address ::1 (CVE-2014-9298)
- reject packets without MAC when authentication is enabled (CVE-2015-1798)
- protect symmetric associations with symmetric key against DoS attack 
(CVE-2015-1799)
- fix generation of MD5 keys with ntp-keygen on big-endian systems 
(CVE-2015-3405)
- add option to set Differentiated Services Code Point (DSCP) (#1202828)
- add nanosecond support to SHM refclock (#1117702)
- allow creating all SHM segments with owner-only access (#1122012)
- allow different thresholds for forward and backward step (#1193154)
- allow symmetric keys up to 32 bytes again (#1191111)
- don't step clock for leap second with -x option (#1191122)
- don't drop packets with source port below 123 (#1171640)
- retry joining multicast groups (#1207014)
- increase memlock limit again (#1053569)
- warn when monitor can't be disabled due to limited restrict (#1191108)
- use larger RSA exponent in ntp-keygen (#1191116)
- fix crash in ntpq mreadvar command (#1180721)
- move sntp kod database to allow SELinux labeling (#1082934)
- fix typos in ntpd man page (#1195211)
- improve documentation of restrict command (#1213953)


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