CVE-2015-1798

Severity: low (CVSS 1.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-04-08 · updated 2026-06-17
Weakness: CWE-17

Description

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.

Affected products

NTP: through 4.2.7p444

References

http://bugs.ntp.org/show_bug.cgi?id=2779
http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html
http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html
http://marc.info/?l=bugtraq&m=143213867103400&w=2
http://rhn.redhat.com/errata/RHSA-2015-1459.html
http://support.apple.com/kb/HT204942
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
http://tools.cisco.com/security/center/viewAlert.x?alertId=38276
http://www.debian.org/security/2015/dsa-3223

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