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RHSA-2014:2025 -- ntp security update (Important)


The Network Time Protocol (NTP) is used to synchronize a computer's time with a referenced time source. 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. (CVE-2014-9295) 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. (CVE-2014-9293) It was found that ntp-keygen used a weak method for generating MD5 keys. This could possibly allow an attacker to guess generated MD5 keys that could then be used to spoof an NTP client or server. Note: it is recommended to regenerate any MD5 keys that had explicitly been generated with ntp-keygen; the default installation does not contain such keys). (CVE-2014-9294) All ntp users are advised to upgrade to this updated package which contains backported patches to resolve these issues. After installing the update the ntpd daemon will restart automatically.

  • CentOS Linux 5
  • Red Hat Enterprise Linux 5
  • RHSA-2014:2025
  • CESA-2014:2025
  • CVE-2014-9293
  • CVE-2014-9294
  • CVE-2014-9295
  • ntp