CVE-2014-9295

Impact:
Important
Public Date:
2014-12-19
CWE:
CWE-119
Bugzilla:
1176037: CVE-2014-9295 ntp: Multiple buffer overflows via specially-crafted packets
Multiple buffer overflow flaws were discovered in ntpd's crypto_recv(), ctl_putdata(), and configure() functions. A remote attacker could use either of these flaws to send a specially crafted request packet that could crash ntpd or, potentially, execute arbitrary code with the privileges of the ntp user. Note: the crypto_recv() flaw requires non default configurations to be active, while the ctl_putdata() flaw, by default, can only be exploited via local attackers, and the configure() flaw requires additional authentication to exploit.

Find out more about CVE-2014-9295 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 6.8
Base Metrics AV:N/AC:M/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux Extended Update Support 6.5 (ntp) RHSA-2015:0104 2015-01-28
Red Hat Enterprise Linux 5 (ntp) RHSA-2014:2025 2014-12-20
Red Hat Enterprise Linux 7 (ntp) RHSA-2014:2024 2014-12-20
Red Hat Enterprise Linux 6 (ntp) RHSA-2014:2024 2014-12-20

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 4 ntp Will not fix

Mitigation

Add these lines (included by default starting with Red Hat Enterprise Linux 5) to the configuration file /etc/ntp.conf:

restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1 
restrict -6 ::1

This restricts server-type functionality to localhost. If ntpd needs to perform time service for specific hosts and networks, you have to list them with suitable restrict statements.

External References

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