NTP BUG 2921: Password Length Memory Corruption Vulnerability

Last update: June 28, 2022 20:06 UTC (57417e17c)


Resolved 4.2.8p4 21 Oct 2015
References Bug 2921 CVE-2015-7854
Affects All ntp-4 releases up to, but not including 4.2.8p4,
and 4.3.0 up to, but not including 4.3.77.
Resolved in 4.2.8p4.
CVSS2 Score 0.0 best case, 1.7 usual case, 6.8, worst case AV:N/AC:H/Au:M/C:C/I:C/A:C


If ntpd is configured to allow remote configuration, and if the (possibly spoofed) source IP address is allowed to send remote configuration requests, and if the attacker knows the remote configuration password or if ntpd was (foolishly) configured to disable authentication, then an attacker can send a set of packets to ntpd that may cause it to crash, with the hypothetical possibility of a small code injection.



This weakness was discovered by Yves Younan and Aleksander Nikolich of Cisco Talos.