Vulnerability identifier: #VU54023

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-7853

CWE-ID: CWE-119

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 execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the "datalen" parameter in the "refclock" driver. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ntp: 4.2.0 - 4.3.76

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External links
http://bugzilla.redhat.com/show_bug.cgi?id=1274262
http://www.securityfocus.com/bid/77273
http://support.ntp.org/bin/view/Main/NtpBug2920
http://security.gentoo.org/glsa/201607-15
http://www.securitytracker.com/id/1033951
http://security.netapp.com/advisory/ntap-20171004-0001/
http://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf

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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.