Input validation error in ntp - CVE-2016-4956
Published: June 10, 2021
Vulnerability identifier: #VU54028
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-4956
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows remote attackers to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (interleaved-mode transition and time change) via a spoofed broadcast packet.
Affected software
ntp
SIMATIC NET CP 443-1 OPC UA
SIMATIC NET CP 443-1 OPC UA
How to mitigate CVE-2016-4956
Install update from vendor's website.
ntp - update to 4.2.8p8
External References
- http://support.ntp.org/bin/view/Main/NtpBug3042
- http://www.kb.cert.org/vuls/id/321640
- http://bugs.ntp.org/3042
- 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/91009
- 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-211752.pdf