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Debian Security Advisory DSA 1948-1 (ntp)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update to ntp announced via advisory DSA 1948-1.
Insight
Insight
Robin Park and Dmitri Vinokurov discovered that the daemon component of the ntp package, a reference implementation of the NTP protocol, is not properly reacting to certain incoming packets. An unexpected NTP mode 7 packets (MODE_PRIVATE) with spoofed IP data can lead ntpd to reply with a mode 7 response to the spoofed address. This may result in the service playing packet ping-pong with other ntp servers or even itself which causes CPU usage and excessive disk use due to logging. An attacker can use this to conduct denial of service attacks. For the oldstable distribution (etch), this problem has been fixed in version 1:4.2.2.p4+dfsg-2etch4. For the stable distribution (lenny), this problem has been fixed in version 1:4.2.4p4+dfsg-8lenny3. For the testing (squeeze) and unstable (sid) distribution, this problem will be fixed soon. We recommend that you upgrade your ntp packages.
Solution
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201948-1