Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2016-4953 |
CWE-ID | CWE-287 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
ntp Server applications / Other server solutions |
Vendor | ntp.org |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU54024
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-4953
CWE-ID:
CWE-287 - Improper Authentication
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsntp: 4.0.72 - 4.2.8p7
External linkshttp://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
http://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us
http://security.gentoo.org/glsa/201607-15
http://www.securitytracker.com/id/1036037
http://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc
http://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
http://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
http://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
Q & A
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.