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2017-07 Security Bulletin: CTP, CTPView, Space: Multiple vulnerabilities in NTP [VU#633847]

  [JSA10796] Show Article Properties


Product Affected:
This issue affects CTPOS 7.1, 7.3. This issue affects CTPView 7.1, 7.3. This issue affects Junos Space all versions prior to 17.1R1.
Problem:

NTP.org has published a security advisory in November 2016 for vulnerabilities resolved in ntpd (NTP daemon). The following is a summary of the vulnerabilities that may impact CTP, CTPView, and/or Junos Space:

CVE CVSS v2 base score Summary
CVE-2016-9311 7.1 (AV:N/AC:M/Au:N/C:N/I:N/A:C) ntpd in NTP before 4.2.8p9, when the trap service is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted packet.
CVE-2016-9310 6.4 (AV:N/AC:L/Au:N/C:P/I:N/A:P) The control mode (mode 6) functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to set or unset traps via a crafted control mode packet.
CVE-2016-7431 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) NTP before 4.2.8p9 allows remote attackers to bypass the origin timestamp protection mechanism via an origin timestamp of zero. NOTE: this vulnerability exists because of a CVE-2015-8138 regression.
CVE-2016-7433 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P) NTP before 4.2.8p9 does not properly perform the initial sync calculations, which allows remote attackers to unspecified impact via unknown vectors, related to a "root distance that did not include the peer dispersion."
CVE-2016-7434 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P) The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.
CVE-2016-9312 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P) ntpd in NTP before 4.2.8p9, when running on Windows, allows remote attackers to cause a denial of service via a large UDP packet.
CVE-2016-7426 4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P) NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
CVE-2016-7429 4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P) NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cause a denial of service (prevent communication with a source) by sending a response for a source to an interface the source does not use.
CVE-2016-7427 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P) The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.
CVE-2016-7428 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P) ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via the poll interval in a broadcast packet.

 
Solution:

The following software releases have been updated to resolve these specific issues and are tracked in the referenced PRs:

CTP Series: 7.1R3, 7.3R2, 7.4R1, and all subsequent releases. Refer to PR 1234179 for details.
CTPView: 7.1R4, 7.3R2, 7.4R1, and all subsequent releases. Refer to PR 1234181 for details.
Junos Space: 17.1R1 and all subsequent releases. Refer to PR 1234176 for details.

KB16765 - "In which releases are vulnerabilities  fixed?" describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
 

Workaround:
It is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use of firewalls and access lists to limit access to network management equipment via NTP only from trusted, administrative networks or hosts will protect against any remote malicious attacks against NTP.
 
Implementation:
Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request.
 
Modification History:
  • 2017-07-12: Initial Publication
Related Links:
CVSS Score:
5.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."