#VU54025 Race condition in ntp - CVE-2016-4954
Vulnerability identifier: #VU54025
Vulnerability risk: Medium
CVSSv4.0: 6.6 [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:
CWE-ID:
CWE-362
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
ntp
Server applications /
Other server solutions
Vendor: ntp.org
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a race condition in the "process_packet" function in ntp_proto.c in ntpd. A remote attacker can exploit the race and cause a denial of service condition on the target system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
ntp: 4.0.72 - 4.2.8p7
External links
https://www.kb.cert.org/vuls/id/321640
https://bugs.ntp.org/3044
https://support.ntp.org/bin/view/Main/NtpBug3044
https://support.ntp.org/bin/view/Main/SecurityNotice
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00023.html
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00018.html
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00024.html
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00028.html
https://lists.opensuse.org/opensuse-security-announce/2016-06/msg00040.html
https://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03757en_us
https://security.gentoo.org/glsa/201607-15
https://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
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.
