PT-2015-7646 · Ntf+5 · Ntp+7

John D Birdwell · Published 2015-10-21 · Updated 2024-06-15 · CVE-2015-7855

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions NTP versions 4.2.x through 4.2.8p3 NTP versions 4.3.x through 4.3.76

Description The issue allows remote attackers to cause a denial of service via a 6 or mode 7 packet containing a long data value. This is due to the decodenetnum function in ntpd, which causes an assertion failure instead of returning FAIL on some invalid values.

Recommendations For NTP versions 4.2.x through 4.2.8p3, update to version 4.2.8p4 or later. For NTP versions 4.3.x through 4.3.76, update to version 4.3.77 or later. As a temporary workaround, consider restricting access to the decodenetnum function until a patch is available.

Exploit

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

ALT-PU-2017-2335

CVE-2015-7855

DLA-335-1

DSA-3388-1

MGASA-2015-0418

OPENSUSE-SU-2024:10181-1

SUSE-SU-2015:2058-1

SUSE-SU-2016:1247-1

SUSE-SU-2016:1311-1

USN-2783-1

Affected Products

Alt Linux

Cisco Ios

Cisco Ios Xe

Cisco Nexus

Ibm Aix

Ntp

Suse

Ubuntu

References · 231

• 🔥 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://exploit-db.com/exploits/40840 · 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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9310 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2016:1311-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2517 · Security Note
• http://debian.org/security/2015/dsa-3388 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4954 · Security Note
• 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
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7702 · Security Note