Detections
Analytics
Scientific Linux Security Update : ntp on SL6.x, SL7.x i386/x86_64 (20160531)
high Nessus Plugin ID 91644
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
Security Fix(es) :- It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time.
(CVE-2015-7979)
- A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time. (CVE-2016-1547)
- It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548)
- A flaw was found in the way NTP's libntp performed message authentication. An attacker able to observe the timing of the comparison function used in packet authentication could potentially use this flaw to recover the message digest. (CVE-2016-1550)
- An out-of-bounds access flaw was found in the way ntpd processed certain packets. An authenticated attacker could use a crafted packet to create a peer association with hmode of 7 and larger, which could potentially (although highly unlikely) cause ntpd to crash.
(CVE-2016-2518)
The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat).
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 91644
File Name: sl_20160531_ntp_on_SL6_x.nasl
Version: 2.7
Type: local
Agent: unix
Published: 6/17/2016
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.8
CVSS v2
Risk Factor: Medium
Base Score: 6.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P
CVSS v3
Risk Factor: High
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:ntp, p-cpe:/a:fermilab:scientific_linux:ntp-debuginfo, p-cpe:/a:fermilab:scientific_linux:ntp-doc, p-cpe:/a:fermilab:scientific_linux:ntp-perl, p-cpe:/a:fermilab:scientific_linux:ntpdate, p-cpe:/a:fermilab:scientific_linux:sntp, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 5/31/2016
Vulnerability Publication Date: 1/6/2017
Reference Information
CVE: CVE-2015-7979, CVE-2016-1547, CVE-2016-1548, CVE-2016-1550, CVE-2016-2518