5.1 - USN-830-1

Executive Summary

Summary
Title	OpenSSL vulnerability

Informations
Name	USN-830-1	First vendor Publication	2009-09-14
Vendor	Ubuntu	Last vendor Modification	2009-09-14
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:H/Au:N/C:P/I:P/A:P)
Cvss Base Score	5.1	Attack Range	Network
Cvss Impact Score	6.4	Attack Complexity	High
Cvss Expoit Score	4.9	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects the following Ubuntu releases:

Ubuntu 6.06 LTS Ubuntu 8.04 LTS Ubuntu 8.10 Ubuntu 9.04

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:
libssl0.9.8 0.9.8a-7ubuntu0.10

Ubuntu 8.04 LTS:
libssl0.9.8 0.9.8g-4ubuntu3.8

Ubuntu 8.10:
libssl0.9.8 0.9.8g-10.1ubuntu2.5

Ubuntu 9.04:
libssl0.9.8 0.9.8g-15ubuntu3.3

After a standard system upgrade you need to reboot your computer to effect the necessary changes.

Details follow:

Dan Kaminsky discovered OpenSSL would still accept certificates with MD2 hash signatures. As a result, an attacker could potentially create a malicious trusted certificate to impersonate another site. This update handles this issue by completely disabling MD2 for certificate validation.