Denial of service in ntp.org ntp



Published: 2013-06-12 | Updated: 2017-03-24
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2013-5211
CWE-ID CWE-20
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
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ntp
Server applications / Other server solutions

Vendor ntp.org

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Denial of service

EUVDB-ID: #VU4013

Risk: High

CVSSv3.1:

CVE-ID: CVE-2013-5211

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

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.

Mitigation

Update to version 4.2.7p26.

Vulnerable software versions

ntp: 4.2.7 - 4.2.7p25


CPE2.3 External links

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc
http://bugs.ntp.org/show_bug.cgi?id=1532

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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