Ubuntu Security Notice USN-1288-1
6th December, 2011
vsftpd vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary
Vsftpd or other applications could be made to crash if vsftpd received specially crafted network traffic.
Software description
- vsftpd - FTP server written for security
Details
It was discovered that the 2.6.35 and earlier Linux kernel does not
properly handle a high rate of creation and cleanup of network namespaces,
which makes it easier for remote attackers to cause a denial of service
(memory consumption) in applications that require a separate namespace per
connection, like vsftpd. This update adjusts vsftpd to only use network
namespaces on kernels that are known to be not affected.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- vsftpd 2.3.2-3ubuntu5.1
- Ubuntu 11.04:
- vsftpd 2.3.2-3ubuntu4.1
- Ubuntu 10.10:
- vsftpd 2.3.0~pre2-4ubuntu2.3
- Ubuntu 10.04 LTS:
- vsftpd 2.2.2-3ubuntu6.3
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.