Ubuntu Security Notice 1223-2 - USN-1223-1 fixed vulnerabilities in Puppet. A regression was found on Ubuntu 10.04 LTS that caused permission denied errors when managing SSH authorized_keys files with Puppet. This update fixes the problem. It was discovered that Puppet unsafely opened files when the k5login type is used to manage files. A local attacker could exploit this to overwrite arbitrary files which could be used to escalate privileges. Ricky Zhou discovered that Puppet did not drop privileges when creating SSH authorized_keys files. A local attacker could exploit this to overwrite arbitrary files as root. It was discovered that Puppet used a predictable filename when using the --edit resource. A local attacker could exploit this to edit arbitrary files or run arbitrary code as the user invoking the program, typically root. Various other issues were also addressed.
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Ubuntu Security Notice USN-1223-2
October 05, 2011
puppet regression
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 10.04 LTS
Summary:
USN-1223-1 caused a regression with managing SSH authorized_keys files.
Software Description:
- puppet: Centralized configuration management
Details:
USN-1223-1 fixed vulnerabilities in Puppet. A regression was found on
Ubuntu 10.04 LTS that caused permission denied errors when managing SSH
authorized_keys files with Puppet. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that Puppet unsafely opened files when the k5login type
is used to manage files. A local attacker could exploit this to overwrite
arbitrary files which could be used to escalate privileges. (CVE-2011-3869)
Ricky Zhou discovered that Puppet did not drop privileges when creating
SSH authorized_keys files. A local attacker could exploit this to overwrite
arbitrary files as root. (CVE-2011-3870)
It was discovered that Puppet used a predictable filename when using the
--edit resource. A local attacker could exploit this to edit arbitrary
files or run arbitrary code as the user invoking the program, typically
root. (CVE-2011-3871)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 10.04 LTS:
puppet-common 0.25.4-2ubuntu6.4
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1223-2
http://www.ubuntu.com/usn/usn-1223-1
https://launchpad.net/bugs/865462
Package Information:
https://launchpad.net/ubuntu/+source/puppet/0.25.4-2ubuntu6.4