Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Denial of service in ntp.org ntp
CVE-2013-5211

Denial of service

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.
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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.

Software: ntp

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.

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

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.