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Ubuntu Security Notice USN-1484-1

Ubuntu Security Notice USN-1484-1
Posted Jun 29, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1484-1 - 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.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2012-2417
MD5 | a0092c020ab04f0de0552b2a64646028

Ubuntu Security Notice USN-1484-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1484-1
June 28, 2012

python-crypto vulnerability
============================================================================

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

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