Security Bulletin - Network Time Protocol update and firewall hardening for Threat Intelligence Exchange Server fixes CVE-2016-1549, CVE-2018-7182, CVE-2018-7183, CVE-2018-7184, CVE-2018-7185
Security Bulletins ID:
SB10238
Last Modified: 5/4/2022
Last Modified: 5/4/2022
Summary
First Published: May 16, 2018
Article contents:
Remediation
CVE-2016-1549, CVE-2018-7182, CVE-2018-7183, CVE-2018-7184, and CVE-2018-7185:
To resolve these vulnerabilities, follow the steps in KB90548 to update the ntp and ntpdate packages in TIE Server.
As a best practice, we recommend configuring an internal NTP service for your network and allow queries only from trusted hosts or networks.
UDP Source Port Pass Firewall:
To resolve this weakness, execute the following command as root in the TIE Server appliances:
Also, we recommend deploying TIE Servers in a controlled corporate network, filtering traffic using a separate dedicated firewall.
Mitigations
CVE-2018-7183:
The ntpq utility is not used by the TIE services, so this vulnerability is not exploitable unless the administrator runs ntpq queries.
Acknowledgements
We credit the Network Time Foundation (NTF) for reporting the NTP flaws.
Back to Contents
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable?
For Appliances:
Use the following instructions for Appliance-based products:
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council’s effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website at: http://www.first.org/cvss/.
When calculating CVSS scores, we've adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
All Security Bulletins are published on our Knowledge Center. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't allow the exclusion or limitation of liability for consequential or incidental damages, so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they shouldn't be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates aren't a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remain at our sole discretion and may be changed or canceled at any time.
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| Impact of Vulnerability: | Denial of Service (CWE-730, OWASP 2004:A9) Out-of-bounds Write (CWE-787) Security Misconfiguration (CWE-933, OWASP 2013:A5) |
| CVE ID: | CVE-2016-1549 CVE-2018-7182 CVE-2018-7183 CVE-2018-7184 CVE-2018-7185 |
| Severity Rating: | CVE-2016-1549: Medium CVE-2018-7182: Medium CVE-2018-7183: Medium CVE-2018-7184: Medium CVE-2018-7185: Medium UDP Source Port Pass Firewall: Medium |
| CVSS v3 Base/Temporal Scores: | CVE-2016-1549: 4.3 / 3.8 CVE-2018-7182: 5.3 / 4.7 CVE-2018-7183: 5.0 / 4.4 CVE-2018-7184: 4.3 / 3.8 CVE-2018-7185: 4.3 / 3.8 UDP Source Port Pass Firewall: 4.8 / 4.1 |
| Recommendations: | Update the Network Time Protocol (NTP) packages to 4.2.8p11-2 Update the Threat Intelligence Exchange (TIE) Server firewall rules |
| Security Bulletin Replacement: | None |
| Affected Software: | TIE Server 1.3.x, 2.0.x, 2.1.x, 2.2.x |
| Location of updated software: | See KB90548. |
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Article contents:
- Vulnerability Description
- Remediation
- Mitigations
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
- CVE-2016-1549
A malicious authenticated peer can create arbitrarily-many ephemeral associations to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and change a victim's clock.
https://nvd.nist.gov/vuln/detail/CVE-2016-1549
- CVE-2018-7182
The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 packet with a ntpd instance from 4.2.8p6 through 4.2.8p10.
https://nvd.nist.gov/vuln/detail/CVE-2018-7182
- CVE-2018-7183
Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code by leveraging an ntpq query and sending a response with a crafted array.
https://nvd.nist.gov/vuln/detail/CVE-2018-7183
- CVE-2018-7184
ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" time stamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin time stamp causing the association to reset and setting the contents of the packet as the most recent time stamp. This issue is a result of an incomplete fix for CVE-2015-7704.
https://nvd.nist.gov/vuln/detail/CVE-2018-7184
- CVE-2018-7185
The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attacker to cause a denial of service (disruption) by continually sending a packet with a zero-origin time stamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.
https://nvd.nist.gov/vuln/detail/CVE-2018-7185
- UDP Source Port Pass Firewall
The default firewall policy in the TIE Server allows UDP packets with a specific source port to pass through while it blocks UDP packets to the same destination ports but with a random source port. This weakness might allow a malicious remote user to reach UDP ports that should be protected by the firewall.
Remediation
CVE-2016-1549, CVE-2018-7182, CVE-2018-7183, CVE-2018-7184, and CVE-2018-7185:
To resolve these vulnerabilities, follow the steps in KB90548 to update the ntp and ntpdate packages in TIE Server.
As a best practice, we recommend configuring an internal NTP service for your network and allow queries only from trusted hosts or networks.
UDP Source Port Pass Firewall:
To resolve this weakness, execute the following command as root in the TIE Server appliances:
iptables -D TIE -p udp --sport 53 --jump ACCEPT && service iptables save
Also, we recommend deploying TIE Servers in a controlled corporate network, filtering traffic using a separate dedicated firewall.
Mitigations
CVE-2018-7183:
The ntpq utility is not used by the TIE services, so this vulnerability is not exploitable unless the administrator runs ntpq queries.
Acknowledgements
We credit the Network Time Foundation (NTF) for reporting the NTP flaws.
Back to Contents
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable?
For Appliances:
Use the following instructions for Appliance-based products:
- Open the Administrator's User Interface (UI).
- Click the About link. The product version is displayed.
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council’s effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website at: http://www.first.org/cvss/.
When calculating CVSS scores, we've adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
- CVE-2016-1549:
Base Score 4.3 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) None (N) Temporal Score (Overall) 3.8 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:T/RC:C
- CVE-2018-7182:
Base Score 5.3 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) None (N) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) None (N) Availability (A) Low (L) Temporal Score (Overall) 4.7 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:T/RC:C
- CVE-2018-7183:
Base Score 5.0 Attack Vector (AV) Network (N) Attack Complexity (AC) High (H) Privileges Required (PR) None (N) User Interaction (UI) Required (R) Scope (S) Unchanged (U) Confidentiality (C) Low (L) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 4.4 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:T/RC:C
- CVE-2018-7184:
Base Score 4.3 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) None (N) Availability (A) Low (L) Temporal Score (Overall) 3.8 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:T/RC:C
- CVE-2018-7185:
Base Score 4.3 Attack Vector (AV) Network (N) Attack Complexity (AC) Low (L) Privileges Required (PR) Low (L) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) None (N) Availability (A) Low (L) Temporal Score (Overall) 3.8 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Confirmed (C)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:T/RC:C
- UDP Source Port Pass Firewall:
Base Score 4.8 Attack Vector (AV) Network (N) Attack Complexity (AC) High (H) Privileges Required (PR) None (N) User Interaction (UI) None (N) Scope (S) Unchanged (U) Confidentiality (C) None (N) Integrity (I) Low (L) Availability (A) Low (L) Temporal Score (Overall) 4.1 Exploitability (E) Unproven (U) Remediation Level (RL) Temporary Fix (T) Report Confidence (RC) Reasonable (R)
NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L/E:U/RL:T/RC:R
All Security Bulletins are published on our Knowledge Center. Security Bulletins are retired (removed) once a product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you respond to this and any other reported security flaws?
Our key priority is the security of our customers. If a vulnerability is found within any of our software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan.
We only publish Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
To contact Technical Support, go to the Create a Service Request page and log on to the ServicePortal.
- If you are a registered user, type your User ID and Password, and then click Log In.
- If you are not a registered user, click Register and complete the fields to have your password and instructions emailed to you.
Disclaimer
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't allow the exclusion or limitation of liability for consequential or incidental damages, so the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are intended to outline our general product direction, and they shouldn't be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates aren't a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remain at our sole discretion and may be changed or canceled at any time.
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