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Ubuntu Security Notice USN-1484-1
June 28, 2012
python-crypto vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS
Summary:
PyCrypto improperly created ElGamal encryption keys.
Software Description:
- python-crypto: cryptographic algorithms and protocols for Python
Details:
It was discovered that PyCrypto produced inappropriate prime numbers when
generating ElGamal keys. An attacker could use this flaw to facilitate
brute-forcing of ElGamal encryption keys.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 LTS:
python-crypto 2.4.1-1ubuntu0.1
Ubuntu 11.10:
python-crypto 2.3-2ubuntu0.1
Ubuntu 11.04:
python-crypto 2.1.0-2ubuntu1.1
Ubuntu 10.04 LTS:
python-crypto 2.0.1+dfsg1-4ubuntu2.2
In general, a standard system update will make all the necessary changes.
If PyCrypto was used to generate ElGamal keys, we recommend they be
regenerated.
References:
http://www.ubuntu.com/usn/usn-1484-1
CVE-2012-2417
Package Information:
https://launchpad.net/ubuntu/+source/python-crypto/2.4.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/python-crypto/2.3-2ubuntu0.1
https://launchpad.net/ubuntu/+source/python-crypto/2.1.0-2ubuntu1.1
https://launchpad.net/ubuntu/+source/python-crypto/2.0.1+dfsg1-4ubuntu2.2