8.5 - USN-843-1

Executive Summary

Summary
Title	BackupPC vulnerability

Informations
Name	USN-843-1	First vendor Publication	2009-10-06
Vendor	Ubuntu	Last vendor Modification	2009-10-06
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:M/Au:S/C:C/I:C/A:C)
Cvss Base Score	8.5	Attack Range	Network
Cvss Impact Score	10	Attack Complexity	Medium
Cvss Expoit Score	6.8	Authentication	Requires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects the following Ubuntu releases:

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 8.04 LTS:
backuppc 3.0.0-4ubuntu1.1

Ubuntu 8.10:
backuppc 3.1.0-3ubuntu2.1

Ubuntu 9.04:
backuppc 3.1.0-4ubuntu1.1

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

Details follow:

It was discovered that BackupPC did not restrict normal users from setting the ClientNameAlias parameter. An authenticated user could exploit this to gain access to unauthorized hosts. This update fixed the issue by preventing normal users from modifying the ClientNameAlias configuration parameter.