PT-2015-6838 · Ntt+7 · Ntp+7

Aanchal Malhotra + 3 · Published 2015-10-22 · Updated 2024-06-15 · CVE-2015-5300

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions NTP versions prior to 4.2.8p5

Description The issue allows remote attackers to bypass security restrictions by exploiting the failure to correctly implement the threshold limitation for the '-g' option. This can be achieved by responding to an unspecified number of requests from trusted sources, potentially allowing an attacker to set NTP to an arbitrary time or alter the time by up to 900 seconds, and leveraging a resulting denial of service. An attacker could exploit this using man-in-the-middle techniques to intercept NTP traffic and make multiple steps larger than the panic threshold.

Recommendations For NTP versions prior to 4.2.8p5, update to version 4.2.8p5 or later to resolve the issue. As a temporary workaround, consider restricting access to trusted sources to minimize the risk of exploitation. Avoid using the '-g' option until the issue is resolved.

Exploit

Fix

DoS

Weakness Enumeration

CWE-361

Related Identifiers

ALT-PU-2017-2335

CESA-2015_1930

CVE-2015-5300

DLA-335-1

DSA-3388-1

FREEBSD-SA-16_02

MGASA-2015-0413

OPENSUSE-SU-2016_1292-1

OPENSUSE-SU-2024:10181-1

RHSA-2015:1930

RHSA-2015_1930

SUSE-SU-2016:1175-1

SUSE-SU-2016:1177-1

SUSE-SU-2016:1247-1

SUSE-SU-2016:1311-1

SUSE-SU-2016_1175-1

SUSE-SU-2016_1177-1

SUSE-SU-2016_1247-1

USN-2783-1

Affected Products

Alt Linux

Centos

Freebsd

Ibm Aix

Ntp

Red Hat

Suse

Ubuntu

References · 308

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_nak_to_the_future.rb · Exploit
• 🔥 https://github.com/opsxcq/exploit-CVE-2016-7434 · Exploit
• https://bdu.fstec.ru/vul/2017-02017 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2516 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5194 · Security Note
• https://security-tracker.debian.org/tracker/source-package/ntp · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4953 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7703 · Security Note
• https://freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7702 · Security Note
• https://bdu.fstec.ru/vul/2017-02039 · Security Note
• https://ubuntu.com/security/CVE-2015-7855 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7705 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2015-5300 · Vendor Advisory