#VU54031 Out-of-bounds read in ntp - CVE-2016-2518

Vulnerability identifier: #VU54031

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-2518

CWE-ID: CWE-125

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 perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the MATCH_ASSOC function. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and cause a denial of service condition on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ntp: 4.2.8p1 - 4.3.91

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External links
https://www.kb.cert.org/vuls/id/718152
https://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_ntp_4_2_8p7_Security
https://support.ntp.org/bin/view/Main/NtpBug3009
https://www.securityfocus.com/bid/88226
https://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
https://security.gentoo.org/glsa/201607-15
https://www.securitytracker.com/id/1035705
https://www.debian.org/security/2016/dsa-3629
https://security.netapp.com/advisory/ntap-20171004-0002/
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
https://access.redhat.com/errata/RHSA-2016:1141
https://rhn.redhat.com/errata/RHSA-2016-1552.html
https://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
https://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
https://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.