Improper Authentication in ntp - CVE-2016-4953
Published: June 10, 2021
Vulnerability identifier: #VU54024
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2016-4953
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
ntp
ntp
Software vendor:
ntp.org
ntp.org
Description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests in ntpd. A remote attacker can send a spoofed crypto-NAK packet with incorrect authentication data at a certain time and cause a denial of service (DoS) condition.
Remediation
Install updates from vendor's website.
External links
- http://www.kb.cert.org/vuls/id/321640
- http://support.ntp.org/bin/view/Main/NtpBug3045
- http://bugs.ntp.org/3045
- http://support.ntp.org/bin/view/Main/SecurityNotice
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.securityfocus.com/bid/91010
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us
- https://security.gentoo.org/glsa/201607-15
- http://www.securitytracker.com/id/1036037
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf