CVE-2018-7170 : What You Need to Know
Learn about CVE-2018-7170, a vulnerability in NTP versions 4.2.x and 4.3.x allowing authenticated users to manipulate clock selection and modify device time. Find mitigation steps here.
In ntp versions 4.2.x prior to 4.2.8p7 and 4.3.x prior to 4.3.92, a vulnerability exists that allows authenticated users with knowledge of the private symmetric key to manipulate the clock selection of ntpd and modify the time on a victim's device through a Sybil attack.
Understanding CVE-2018-7170
This CVE entry describes a security flaw in the Network Time Protocol (NTP) software.
What is CVE-2018-7170?
CVE-2018-7170 is a vulnerability in ntpd in specific versions of NTP that enables authenticated users to create numerous temporary associations, affecting the clock selection and potentially altering the time on a targeted device.
The Impact of CVE-2018-7170
The vulnerability allows attackers to manipulate the clock selection of ntpd and modify the time on a victim's device through a Sybil attack, posing a significant security risk.
Technical Details of CVE-2018-7170
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The flaw in ntpd allows authenticated users with the private symmetric key to create multiple ephemeral associations, influencing the clock selection and potentially changing the victim's clock.
Affected Systems and Versions
- ntp versions 4.2.x before 4.2.8p7
- ntp versions 4.3.x before 4.3.92
Exploitation Mechanism
The vulnerability arises due to an incomplete resolution of a previous CVE (CVE-2016-1549), enabling users with the private symmetric key to exploit the flaw.
Mitigation and Prevention
Protecting systems from CVE-2018-7170 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update NTP software to versions 4.2.8p7 or 4.3.92 to mitigate the vulnerability.
- Monitor NTP server logs for any suspicious activities.
Long-Term Security Practices
- Regularly review and update NTP configurations and security settings.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
- Apply patches provided by the NTP project to address the vulnerability and enhance system security.