Ubuntu Security Notice USN-777-1
19th 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
Details
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 version:
- 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-server 1:4.2.0a+stable-8.1ubuntu6.2
- ntp 1:4.2.0a+stable-8.1ubuntu6.2
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.