Zero-day vulnerability in ntp
Denial of service
CVE-2013-5211
This vulnerability was the cause of a record-sized NTP reflection attack in late 2013 and early 2014. We consider this a zero-day vulnerability as it was exploited in the wild before the official patch release.
Vulnerability details
Advisory: SB2013061201 - Denial of service in ntp.org ntp
Vulnerable component: ntp
CVE-ID: CVE-2013-5211
CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C
CWE-ID: CWE-20 - Improper input validation
Description:
The vulnerability allows a remote attacker to cause DoS conditions on the target system.
The weakness exists due to an error in the monlist feature in ntp_request.c. By sending a specially crafted REQ_MON_GETLIST or REQ_MON_GETLIST_1 request, a remote attacker can consume available CPU resources and cause the server to crash.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.
Note: the vulnerability was being actively exploited.
Public Exploits:
- NTP ntpd monlist Query Reflection - Denial of Service [Exploit-DB]
External links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5211
http://www.vmware.com/security/advisories/VMSA-2014-0002.html
https://packetstormsecurity.com/files/125774
http://www.kb.cert.org/vuls/id/348126
https://www.us-cert.gov/ncas/alerts/TA13-088A
http://christian-rossow.de/articles/Amplification_DDoS.php
https://www.symantec.com/connect/blogs/hackers-spend-christmas-break-launching-large-scale-ntp-refle...
http://www.kb.cert.org/vuls/id/348126
http://christian-rossow.de/articles/Amplification_DDoS.php
http://bugs.ntp.org/show_bug.cgi?id=1532