U radu programskog paketa Thunderbird otkrivena je sigurnosna ranjivost. Zlonamjerni napadači mogu pomoću te ranjivosti izvesti MITM napad te otkriti osjetljive informacije.

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Fedora Update Notification
FEDORA-2011-17399
2011-12-23 03:10:48
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Name        : thunderbird
Product     : Fedora 15
Version     : 9.0
Release     : 4.fc15
URL         : http://www.mozilla.org/projects/thunderbird/
Summary     : Mozilla Thunderbird mail/newsgroup client
Description :
Mozilla Thunderbird is a standalone mail and newsgroup client.

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Update Information:

The latest version of Firefox and Thunderbird have the following changes:

* Added Type Inference, significantly improving JavaScript performance
* Added support for querying Do Not Track status via JavaScript
* Added support for font-stretch
* Improved support for text-overflow
* Improved standards support for HTML5, MathML, and CSS
* Fixed several stability issues
* Fixed several security issues

Notable nss changes include:

1. SSL 2.0 is disabled by default.

2. A defense against the SSL 3.0 and TLS 1.0 CBC chosen plaintext attack
demonstrated by Rizzo and Duong (CVE-2011-3389) is enabled by default.
Set the SSL_CBC_RANDOM_IV SSL option to PR_FALSE to disable it.

3. SHA-224 is supported.

4. Added PORT_ErrorToString and PORT_ErrorToName to return the
error message and symbolic name of an NSS error code.

5. Added NSS_GetVersion to return the NSS version string.

6. Added experimental support of RSA-PSS to the softoken only
(contributed by Hanno BÄ