USN-1484-1: PyCrypto vulnerability

Releases

• Ubuntu 12.04
• Ubuntu 11.10
• Ubuntu 11.04
• Ubuntu 10.04

Packages

• 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

• 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

• 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

• CVE-2012-2417