10 - USN-729-1

Executive Summary

Summary
Title	Python Crypto vulnerability

Informations
Name	USN-729-1	First vendor Publication	2009-03-05
Vendor	Ubuntu	Last vendor Modification	2009-03-05
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score	10	Attack Range	Network
Cvss Impact Score	10	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects the following Ubuntu releases:

Ubuntu 6.06 LTS Ubuntu 7.10 Ubuntu 8.04 LTS Ubuntu 8.10

This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to the following package versions:

Ubuntu 6.06 LTS:
python2.4-crypto 2.0.1+dfsg1-1ubuntu1.1

Ubuntu 7.10:
python-crypto 2.0.1+dfsg1-2ubuntu1.1

Ubuntu 8.04 LTS:
python-crypto 2.0.1+dfsg1-2.1ubuntu1.1

Ubuntu 8.10:
python-crypto 2.0.1+dfsg1-2.3ubuntu0.1

In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow:

Mike Wiacek discovered that the ARC2 implementation in Python Crypto did not correctly check the key length. If a user or automated system were tricked into processing a malicious ARC2 stream, a remote attacker could execute arbitrary code or crash the application using Python Crypto, leading to a denial of service.