CVE-2014-9293

Impact:
Moderate
Public Date:
2014-12-19
CWE:
CWE-338
Bugzilla:
1176032: CVE-2014-9293 ntp: automatic generation of weak default key in config_auth()
It was found that ntpd automatically generated weak keys for its internal use if no ntpdc request authentication key was specified in the ntp.conf configuration file. A remote attacker able to match the configured IP restrictions could guess the generated key, and possibly use it to send ntpdc query or configuration requests.

Find out more about CVE-2014-9293 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 4
Base Metrics AV:N/AC:H/Au:N/C:P/I:P/A:N
Access Vector Network
Access Complexity High
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact None

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

Mitigation

Issue these commands to explicitly generate a strong key and add it to the
ntpd configuration:

    echo trustedkey 65535 >> /etc/ntp.conf
    printf "65535\tM\t%s\n" $(tr -cd a-zA-Z0-9 < /dev/urandom | head -c 16) >> /etc/ntp/keys

The generated key has about 95 bits of entropy.

External References

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