Multiple Vulnerabilities in Network Time Protocol Daemon Affecting Cisco Products: January 2016

Multiple Cisco products incorporate a version of the Network Time Protocol daemon (ntpd) package. Versions of this package are affected by one or more vulnerabilities that could allow an unauthenticated, remote attacker to create a denial of service (DoS) condition or modify the time being advertised by a device acting as a Network Time Protocol (NTP) server. On January 19, 2016, NTP Consortium at Network Time Foundation released a security advisory detailing 12 issues regarding multiple DoS vulnerabilities, information disclosure vulnerabilities, and logic issues that may allow an attacker to shift a client's time. The vulnerabilities covered in this document are as follows: - CVE-2015-7973: Network Time Protocol Replay Attack on Authenticated Broadcast Mode Vulnerability - CVE-2015-7974: Network Time Protocol Missing Trusted Key Check - CVE-2015-7975: Standard Network Time Protocol Query Program nextvar() Missing Length Check - CVE-2015-7976: Standard Network Time Protocol Query Program saveconfig Command Allows Dangerous Characters in Filenames - CVE-2015-7978: Network Time Protocol Daemon reslist NULL Pointer Deference Denial of Service Vulnerability - CVE-2015-7977: Network Time Protocol Stack Exhaustion Denial of Service - CVE-2015-7979: Network Time Protocol Off-Path Broadcast Mode Denial of Service - CVE-2015-8138: Network Time Protocol Zero Origin Timestamp Bypass - CVE-2015-8139: Network Time Protocol Information Disclosure of Origin Timestamp - CVE-2015-8140: Standard Network Time Protocol Query Program Replay Attack - CVE-2015-8158: Standard and Special Network Time Protocol Query Program Infinite loop Cisco has released software updates that address these vulnerabilities. Workarounds that address some of these vulnerabilities may be available. Available workarounds will be documented in the corresponding Cisco bug for each affected product.

Checks if a vulnerable version is present on the target host.

See the referenced vendor advisory for a solution.