============================================================================ Ubuntu Security Notice USN-2449-1 December 22, 2014 ntp vulnerabilities ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.10 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS - Ubuntu 10.04 LTS Summary: Several security issues were fixed in NTP. Software Description: - ntp: Network Time Protocol daemon and utility programs Details: Neel Mehta discovered that NTP generated weak authentication keys. A remote attacker could possibly use this issue to brute force the authentication key and send requests if permitted by IP restrictions. (CVE-2014-9293) Stephen Roettger discovered that NTP generated weak MD5 keys. A remote attacker could possibly use this issue to brute force the MD5 key and spoof a client or server. (CVE-2014-9294) Stephen Roettger discovered that NTP contained buffer overflows in the crypto_recv(), ctl_putdata() and configure() functions. In non-default configurations, a remote attacker could use these issues to cause NTP to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. In addition, attackers would be isolated by the NTP AppArmor profile. (CVE-2014-9295) Stephen Roettger discovered that NTP incorrectly continued processing when handling certain errors. (CVE-2014-9296) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.10: ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.10.1 Ubuntu 14.04 LTS: ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.1 Ubuntu 12.04 LTS: ntp 1:4.2.6.p3+dfsg-1ubuntu3.2 Ubuntu 10.04 LTS: ntp 1:4.2.4p8+dfsg-1ubuntu2.2 After a standard system update you need to regenerate any MD5 keys that were manually created with ntp-keygen. References: http://www.ubuntu.com/usn/usn-2449-1 CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296 Package Information: https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.10.1 https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.1 https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p3+dfsg-1ubuntu3.2 https://launchpad.net/ubuntu/+source/ntp/1:4.2.4p8+dfsg-1ubuntu2.2