Remote code execution in NTP

1) Buffer overflow

EUVDB-ID: #VU54023

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-7853

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:ntp_org:ntp:4.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:ntp_org:ntp:4.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:ntp_org:ntp:4.2.2p1:*:*:*:*:*:*:*

External links

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

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.