#VU20339 NULL pointer dereference in ntp - CVE-2019-8936
Published: August 20, 2019 / Updated: October 28, 2023
Vulnerability identifier: #VU20339
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-8936
CWE-ID: CWE-476
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 perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when processing authenticated mode 6 packets. A remote attacker can send malicious authenticated mode 6 (ntpq) packet from a permitted network address, trigger a NULL pointer dereference error and crash ntpd.
Remediation
Install update from vendor's website.
External links
- http://support.ntp.org/bin/view/Main/NtpBug3565
- http://bugs.ntp.org/show_bug.cgi?id=3565
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00032.html
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00036.html
- http://packetstormsecurity.com/files/152915/FreeBSD-Security-Advisory-FreeBSD-SA-19-04.ntp.html
- http://support.ntp.org/bin/view/Main/SecurityNotice
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NVS2CSG2TQ663CXOZZUJN4STQPMENNP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JBGXY7OKWOLT6X6JAPVZRFEP4FLCGGST/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQDNHNYOJK2SRSGO23GQ2RXTOUY2HLNN/
- https://seclists.org/bugtraq/2019/May/39
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:04.ntp.asc
- https://security.gentoo.org/glsa/201903-15
- https://security.netapp.com/advisory/ntap-20190503-0001/
- https://support.f5.com/csp/article/K61363039