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AUSCERT External Security Bulletin Redistribution
ESB-2015.0029
Out of Cycle Security Bulletin: Multiple vulnerabilities in NTP
6 January 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
NSM
NSMXpress
NSM Series Appliances
Publisher: Juniper Networks
Operating System: Juniper
Network Appliance
Linux variants
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Existing Account
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-9296 CVE-2014-9295 CVE-2014-9294
CVE-2014-9293
Reference: ESB-2014.2519
ESB-2014.2497
ESB-2014.2476
ESB-2014.2473
ESB-2014.2472
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10663
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Out of Cycle Security Bulletin: Multiple vulnerabilities in NTP
Categories:
Junos
NSMXpress
NSM
NSM3000
SIRT Advisory
Security Advisories ID: JSA10663
Last Updated: 05 Jan 2015
Version: 1.0
Product Affected:
Junos OS, NSM Series devices, NSMXpress and NSM server software.
Problem:
NTP.org has published a security advisory for six vulnerabilities resolved in
ntpd (NTP daemon) that have been assigned four CVE IDs. In the worst case,
some of these issues may allow remote unauthenticated attackers to execute
code with the privileges of ntpd or cause a denial of service condition.
CVE CVSS v2 base score Summary
CVE-2014-9295 7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P) Three stack-based buffer overflows in ntpd.
CVE-2014-9293 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) When an auth key is not configured ntpd generates a weak default key.
CVE-2014-9294 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N) The ntp-keygen utility in NTP before 4.2.7p230 create cryptographically weak symmetric keys.
CVE-2014-9296 0.0 (AV:N/AC:L/Au:N/C:N/I:N/A:N) ntpd continues to execute after detecting a certain authentication error. This issue has an unknown impact.
Vulnerable Products:
Junos OS: Junos is confirmed to be vulnerable to one of the three buffer
overflow issues covered by CVE-2014-9295. This is only exploitable
on systems where NTP server is enabled within the [edit system ntp]
hierarchy level. The remaining three CVEs are being evaluated.
NSM: NSM software, NSMXpress and NSM Series Appliances are vulnerable
to these issues if the "Automatically Sync Time" option (under Time
Server settings in the Web UI) is checked. This is off by default. NSM
server software installed on generic Linux or Solaris servers may
require NTP fixes from the respective server OS vendor.
Products not vulnerable:
ScreenOS is not vulnerable. The NTP module in ScreenOS was designed
and coded by Juniper Networks. It is not based on ntpd from NTP Project.
Pulse Secure (IC/MAG/SA, etc.) products are not vulnerable. The
Pulse Secure products do not include NTP server functionality and are
therefore not vulnerable to these issues.
As new information becomes available on products that are not listed above,
this document will be updated.
Solution:
This section will be updated when fixes for the vulnerabilities are
available.
Workaround:
Junos OS: Standard security best current practices (control plane firewall
filters, edge filtering, access lists, etc.) will protect against any
remote malicious attacks against NTP. Customers who have already applied
the workaround described in JSA10613 are already protected against any
remote exploitation of these vulnerabilities. Refer to the Workaround
section of JSA10613 for specific applicable mitigation techniques.
NSM: Turning off NTP daemon by unchecking the "Automatically Sync Time"
option (under Time Server settings in Web UI) should completely mitigate
these issues.
Implementation:
Modification History:
2015-01-05: Initial release.
Related Links:
KB16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's
Security Advisories
Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
NTP Project "Recent Vulnerabilities" Security Notice
CVSS Score:
7.5 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Risk Level:
High
Risk Assessment:
These issues may allow remote unauthenticated attackers to execute code
with the privileges of ntpd or cause a denial of service condition
Acknowledgements:
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