Effective 2019 Sep 15, Cisco will no longer publish non-Cisco product alerts. Cisco will continue to publish Security Advisories to address third-party software vulnerabilities per the Cisco Security Vulnerability Policy.
Multivendor Vulnerability Alert
Network Time Protocol Port 123 Usage Off-Path Attack Vulnerability
A vulnerability in Network Time Protocol (NTP) could allow an unauthenticated, remote attacker to compromise a targeted system completely.
The vulnerability is due to improper use of port 123 by the affected software. An attacker could exploit this vulnerability by sending a packet that submits malicious input to the targeted system. A successful exploit could allow the attacker to conduct an off-path attack, resulting in complete system compromise.
NTP.org has not confirmed the vulnerability, and software updates are not available.
To exploit this vulnerability, an attacker must send a packet that submits malicious input
to the targeted system. This access requirement may reduce the
likelihood of a successful exploit.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to run both firewall and antivirus
applications to minimize the potential of inbound and outbound threats.
Administrators may consider using IP-based access control lists (ACLs)
to allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
At the time this alert was first published, NTP.org had not released a security advisory.
At the time this alert was first published, NTP.org had not released a software update.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.