USN-777-1: Ntp vulnerabilities

19 May 2009

ntp vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS

Software Description

  • ntp


A stack-based buffer overflow was discovered in ntpq. If a user were tricked into connecting to a malicious ntp server, a remote attacker could cause a denial of service in ntpq, or possibly execute arbitrary code with the privileges of the user invoking the program. (CVE-2009-0159)

Chris Ries discovered a stack-based overflow in ntp. If ntp was configured to use autokey, a remote attacker could send a crafted packet to cause a denial of service, or possibly execute arbitrary code. (CVE-2009-1252)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.04
ntp - 1:4.2.4p4+dfsg-7ubuntu5.1
Ubuntu 8.10
ntp - 1:4.2.4p4+dfsg-6ubuntu2.3
Ubuntu 8.04 LTS
ntp - 1:4.2.4p4+dfsg-3ubuntu2.2
Ubuntu 6.06 LTS
ntp - 1:4.2.0a+stable-8.1ubuntu6.2
ntp-server - 1:4.2.0a+stable-8.1ubuntu6.2

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.