NTP: Network Time Protocol Daemon crypto-NAK Authentication Bypass
This signature detects attempts to exploit a known vulnerability against NTP Daemon. The vulnerability is due to improper validation of crypto-NAK packets that leads to an NTP Symmetric association to be established with an unauthorized peer. A remote, unauthenticated attacker can exploit this vulnerability by sending a crafted crypto-NAK NTP packet to the vulnerable service. Successful exploitation will let the attacker change the time on the target system, resulting in a policy bypass and potentially other security vulnerabilities.
Extended Description
Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.
Affected Products
Netapp oncommand_performance_manager
References
CVE: CVE-2015-7871
Short Name
NTP:CRYPTO-NAK-AUTH-BYPASS
Severity
Major
Recommended
True
Recommended Action
Drop
Category
NTP
Keywords
Authentication Bypass CVE-2015-7871 Daemon Network Protocol Time crypto-NAK
Release Date
02/08/2016
Supported Platforms
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vsrx-19.2
srx-19.3
srx-branch-12.3
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx-12.3
vmx-19.3
srx-12.3
Sigpack Version
3590
False Positive
Unknown
Vendors
Ntp
Netapp
Debian
CVSS Score
7.5