5.8 - USN-909-1

Executive Summary

Summary
Title	dpkg vulnerability

Informations
Name	USN-909-1	First vendor Publication	2010-03-11
Vendor	Ubuntu	Last vendor Modification	2010-03-11
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:N/C:N/I:P/A:P)
Cvss Base Score	5.8	Attack Range	Network
Cvss Impact Score	4.9	Attack Complexity	Medium
Cvss Expoit Score	8.6	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 Ubuntu 9.10

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:
dpkg-dev 1.13.11ubuntu7.1

Ubuntu 8.04 LTS:
dpkg-dev 1.14.16.6ubuntu4.1

Ubuntu 8.10:
dpkg-dev 1.14.20ubuntu6.3

Ubuntu 9.04:
dpkg-dev 1.14.24ubuntu1.1

Ubuntu 9.10:
dpkg-dev 1.15.4ubuntu2.1

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

Details follow:

William Grant discovered that dpkg-source did not safely apply diffs when unpacking source packages. If a user or an automated system were tricked into unpacking a specially crafted source package, a remote attacker could modify files outside the target unpack directory, leading to a denial of service or potentially gaining access to the system.