Executive Summary

Summary
Title python-cryptography vulnerability
Informations
Name USN-3138-1 First vendor Publication 2016-11-28
Vendor Ubuntu Last vendor Modification 2016-11-28
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:N/I:P/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.10 - Ubuntu 16.04 LTS

Summary:

python-cryptography could generate incorrect keys.

Software Description: - python-cryptography: Cryptography Python library

Details:

Markus Döring discovered that python-cryptography incorrectly handled certain HKDF lengths. This could result in python-cryptography returning an empty string instead of the expected derived key.

Update instructions:

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

Ubuntu 16.10:
python-cryptography 1.5-2ubuntu0.1
python3-cryptography 1.5-2ubuntu0.1

Ubuntu 16.04 LTS:
python-cryptography 1.2.3-1ubuntu0.1
python3-cryptography 1.2.3-1ubuntu0.1

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

References:
http://www.ubuntu.com/usn/usn-3138-1
CVE-2016-9243

Package Information:
https://launchpad.net/ubuntu/+source/python-cryptography/1.5-2ubuntu0.1
https://launchpad.net/ubuntu/+source/python-cryptography/1.2.3-1ubuntu0.1

Original Source

Url : http://www.ubuntu.com/usn/USN-3138-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 2
Os 3

Nessus® Vulnerability Scanner

Date Description
2016-12-05 Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_e5dcb942ba6f11e6b1cf14dae9d210b8.nasl - Type : ACT_GATHER_INFO
2016-11-29 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-3138-1.nasl - Type : ACT_GATHER_INFO
2016-11-22 Name : The remote Fedora host is missing one or more security updates.
File : fedora_2016-d3a2b640ce.nasl - Type : ACT_GATHER_INFO
2016-11-21 Name : The remote Fedora host is missing one or more security updates.
File : fedora_2016-2d90e27e50.nasl - Type : ACT_GATHER_INFO
2016-11-21 Name : The remote Fedora host is missing one or more security updates.
File : fedora_2016-e77c8c1f3b.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
2
3
Date Informations
2017-04-04 21:24:58
  • Multiple Updates
2017-03-27 21:22:44
  • Multiple Updates
2016-11-30 13:24:30
  • Multiple Updates
2016-11-28 21:25:15
  • First insertion