Vulnerability identifier: #VU37084
Vulnerability risk: Medium
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
ntp
Server applications /
Other server solutions
FreeBSD
Operating systems & Components /
Operating system
Vendor:
ntp.org
FreeBSD Foundation
Description
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
An exploitable denial of service vulnerability exists in the origin timestamp check functionality of ntpd 4.2.8p9. A specially crafted unauthenticated network packet can be used to reset the expected origin timestamp for target peers. Legitimate replies from targeted peers will fail the origin timestamp check (TEST2) causing the reply to be dropped and creating a denial of service condition.
Mitigation
Install update from vendor's website.
Vulnerable software versions
ntp: 4.2.8
FreeBSD: 4.2.8 - 11.0
External links
http://www.securityfocus.com/bid/97046
http://www.securitytracker.com/id/1038123
http://www.securitytracker.com/id/1039427
http://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
http://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
http://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0260
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.