CVE-2014-9295
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.