5.1 - USN-970-1

Executive Summary

Summary
Title	GnuPG2 vulnerability

Informations
Name	USN-970-1	First vendor Publication	2010-08-11
Vendor	Ubuntu	Last vendor Modification	2010-08-11
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: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 8.04 LTS Ubuntu 9.04 Ubuntu 9.10 Ubuntu 10.04 LTS

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:
gpgsm 2.0.7-1ubuntu0.1

Ubuntu 9.04:
gpgsm 2.0.9-3.1ubuntu0.1

Ubuntu 9.10:
gpgsm 2.0.12-0ubuntu2.1

Ubuntu 10.04 LTS:
gpgsm 2.0.14-1ubuntu1.2

In general, a standard system update will make all the necessary changes.

Details follow:

It was discovered that GPGSM in GnuPG2 did not correctly handle certificates with a large number of Subject Alternate Names. If a user or automated system were tricked into processing a specially crafted certificate, an attacker could cause a denial of service or execute arbitrary code with privileges of the user invoking the program.