Input validation error in NTP

1) Input validation error

EUVDB-ID: #VU54022

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-8138

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can bypass the origin timestamp validation via a packet with an origin timestamp set to zero.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

ntp: 4.2.8p1 - 4.3.89

External links

http://www.kb.cert.org/vuls/id/718152
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161123-ntpd
http://security.gentoo.org/glsa/201607-15
http://bto.bluecoat.com/security-advisory/sa113
http://www.ubuntu.com/usn/USN-3096-1
http://www.securitytracker.com/id/1034782
http://www.securityfocus.com/bid/81811
http://www.debian.org/security/2016/dsa-3629
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd
http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security
http://rhn.redhat.com/errata/RHSA-2016-0063.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176434.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us
http://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us
http://security.netapp.com/advisory/ntap-20171031-0001/
http://security.netapp.com/advisory/ntap-20171004-0002/
http://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc
http://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
http://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
http://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.