Channels ▼
RSS

Open Source

OpenSSL Closes Security Hole Six Pack


The OpenSSL Project's developer team has released updates to address six security flaws including one "critical vulnerability" that has been highlighted in the Cipher Block Chaining (CBC) encryption mode. Security is a prime concern for the project given its openly stated aim to create a commercial-grade Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1).

The project team has issued the following security advisory statement: "Nadhem Alfardan and Kenny Paterson have discovered an extension of the Vaudenay 'padding oracle' attack on CBC mode encryption, which enables an efficient plaintext recovery attack against the OpenSSL implementation of DTLS. Their attack exploits timing differences arising during decryption processing."

Reports suggest that a CBC vulnerability was highlighted at one point last year. This flaw is thought to have come about due to a lack of randomization in the CBC initialization process. The problems have been compounded by additional fears relating to the use of uninitialized memory that have been identified when padding out SSL 3.0 blocks.

Note: In cryptography, an encryption oracle works by encrypting input it receives under certain key. A random oracle always answers with consistently random data; a padding oracle decrypts an input message to inform the system whether the padding was correct.


Related Reading


More Insights






Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Video