- Vulnerability/
- RHSA-2009:1648
RHSA-2009:1648: Moderate: ntp security update
First published: Tue Dec 08 2009(Updated: )
The Network Time Protocol (NTP) is used to synchronize a computer's time<br>with a referenced time source.<br>Robin Park and Dmitri Vinokurov discovered a flaw in the way ntpd handled<br>certain malformed NTP packets. ntpd logged information about all such<br>packets and replied with an NTP packet that was treated as malformed when<br>received by another ntpd. A remote attacker could use this flaw to create<br>an NTP packet reply loop between two ntpd servers via a malformed packet<br>with a spoofed source IP address and port, causing ntpd on those servers to<br>use excessive amounts of CPU time and fill disk space with log messages.<br>(CVE-2009-3563)<br>All ntp users are advised to upgrade to this updated package, which<br>contains a backported patch to resolve this issue. After installing the<br>update, the ntpd daemon will restart automatically.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/ntp | <4.2.2p1-9.el5_4.1 | 4.2.2p1-9.el5_4.1 |
| redhat/ntp | <4.2.2p1-9.el5_4.1 | 4.2.2p1-9.el5_4.1 |
| redhat/ntp | <4.2.0.a.20040617-8.el4_8.1 | 4.2.0.a.20040617-8.el4_8.1 |
| redhat/ntp | <4.2.0.a.20040617-8.el4_8.1 | 4.2.0.a.20040617-8.el4_8.1 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2009:1648?
The severity of RHSA-2009:1648 is classified as moderate.
How do I fix RHSA-2009:1648?
To fix RHSA-2009:1648, you should update the ntp package to versions 4.2.2p1-9.el5_4.1 or 4.2.0.a.20040617-8.el4_8.1 depending on your system.
What systems are affected by RHSA-2009:1648?
The affected systems include those running the ntp package prior to the specified update versions.
What was the cause of the vulnerability in RHSA-2009:1648?
The vulnerability in RHSA-2009:1648 was caused by a flaw in how ntpd handled certain malformed NTP packets.
Is there a workaround for RHSA-2009:1648?
There is no specific workaround for RHSA-2009:1648; updating the software is recommended to mitigate the vulnerability.
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