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FreeBSD : FreeBSD -- Multiple vulnerabilities of ntp (fcedcdbb-c86e-11e6-b1cf-14dae9d210b8)
medium Nessus Plugin ID 96123
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Synopsis
The remote FreeBSD host is missing one or more security-related updates.Description
Multiple vulnerabilities have been discovered in the NTP suite :CVE-2016-9311: Trap crash, Reported by Matthew Van Gundy of Cisco ASIG.
CVE-2016-9310: Mode 6 unauthenticated trap information disclosure and DDoS vector. Reported by Matthew Van Gundy of Cisco ASIG.
CVE-2016-7427: Broadcast Mode Replay Prevention DoS. Reported by Matthew Van Gundy of Cisco ASIG.
CVE-2016-7428: Broadcast Mode Poll Interval Enforcement DoS. Reported by Matthew Van Gundy of Cisco ASIG.
CVE-2016-7431: Regression: 010-origin: Zero Origin Timestamp Bypass.
Reported by Sharon Goldberg and Aanchal Malhotra of Boston University.
CVE-2016-7434: NULL pointer dereference in
_IO_str_init_static_internal(). Reported by Magnus Stubman.
CVE-2016-7426: Client rate limiting and server responses. Reported by Miroslav Lichvar of Red Hat.
CVE-2016-7433: Reboot sync calculation problem. Reported independently by Brian Utterback of Oracle, and by Sharon Goldberg and Aanchal Malhotra of Boston University. Impact : A remote attacker who can send a specially crafted packet to cause a NULL pointer dereference that will crash ntpd, resulting in a Denial of Service. [CVE-2016-9311]
An exploitable configuration modification vulnerability exists in the control mode (mode 6) functionality of ntpd. If, against long-standing BCP recommendations, 'restrict default noquery ...' is not specified, a specially crafted control mode packet can set ntpd traps, providing information disclosure and DDoS amplification, and unset ntpd traps, disabling legitimate monitoring by an attacker from remote.
[CVE-2016-9310]
An attacker with access to the NTP broadcast domain can periodically inject specially crafted broadcast mode NTP packets into the broadcast domain which, while being logged by ntpd, can cause ntpd to reject broadcast mode packets from legitimate NTP broadcast servers.
[CVE-2016-7427]
An attacker with access to the NTP broadcast domain can send specially crafted broadcast mode NTP packets to the broadcast domain which, while being logged by ntpd, will cause ntpd to reject broadcast mode packets from legitimate NTP broadcast servers. [CVE-2016-7428]
Origin timestamp problems were fixed in ntp 4.2.8p6. However, subsequent timestamp validation checks introduced a regression in the handling of some Zero origin timestamp checks. [CVE-2016-7431]
If ntpd is configured to allow mrulist query requests from a server that sends a crafted malicious packet, ntpd will crash on receipt of that crafted malicious mrulist query packet. [CVE-2016-7434]
An attacker who knows the sources (e.g., from an IPv4 refid in server response) and knows the system is (mis)configured in this way can periodically send packets with spoofed source address to keep the rate limiting activated and prevent ntpd from accepting valid responses from its sources. [CVE-2016-7426]
Ntp Bug 2085 described a condition where the root delay was included twice, causing the jitter value to be higher than expected. Due to a misinterpretation of a small-print variable in The Book, the fix for this problem was incorrect, resulting in a root distance that did not include the peer dispersion. The calculations and formulas have been reviewed and reconciled, and the code has been updated accordingly.
[CVE-2016-7433]
Solution
Update the affected packages.See Also
Plugin Details
Severity: Medium
ID: 96123
File Name: freebsd_pkg_fcedcdbbc86e11e6b1cf14dae9d210b8.nasl
Version: 3.14
Type: local
Family: FreeBSD Local Security Checks
Published: 12/27/2016
Updated: 1/7/2026
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 6.4
Temporal Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P
CVSS Score Source: CVE-2016-9310
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 5.9
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:freebsd
Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 12/22/2016
Vulnerability Publication Date: 12/22/2016
Reference Information
CVE: CVE-2016-7426, CVE-2016-7427, CVE-2016-7428, CVE-2016-7431, CVE-2016-7433, CVE-2016-7434, CVE-2016-9310, CVE-2016-9311
FreeBSD: SA-16:39.ntp