Referenced CVEs:
CVE-2009-0021
Description:
=========================================================== Ubuntu Security Notice USN-705-1 January 08, 2009 ntp vulnerability CVE-2009-0021 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 7.10 Ubuntu 8.04 LTS Ubuntu 8.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: ntp-refclock 1:4.2.0a+stable-8.1ubuntu6.1 ntp-simple 1:4.2.0a+stable-8.1ubuntu6.1 Ubuntu 7.10: ntp 1:4.2.4p0+dfsg-1ubuntu2.1 Ubuntu 8.04 LTS: ntp 1:4.2.4p4+dfsg-3ubuntu2.1 Ubuntu 8.10: ntp 1:4.2.4p4+dfsg-6ubuntu2.2 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that NTP did not properly perform signature verification. A remote attacker could exploit this to bypass certificate validation via a malformed SSL/TLS signature.