openssl vulnerabilities

9 January 2014

openssl vulnerabilities

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

• Ubuntu 13.10
• Ubuntu 13.04
• Ubuntu 12.10
• Ubuntu 12.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software Description

• openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

Anton Johansson discovered that OpenSSL incorrectly handled certain invalid TLS handshakes. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2013-4353)

Ron Barber discovered that OpenSSL used an incorrect data structure to obtain a version number. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2013-6449)

Dmitry Sobinov discovered that OpenSSL incorrectly handled certain DTLS retransmissions. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2013-6450)

This update also disables the default use of the RdRand feature of certain Intel CPUs as the sole source of entropy.

Update instructions

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

Ubuntu 13.10

libssl1.0.0 - 1.0.1e-3ubuntu1.1

Ubuntu 13.04

libssl1.0.0 - 1.0.1c-4ubuntu8.2

Ubuntu 12.10

libssl1.0.0 - 1.0.1c-3ubuntu2.6

Ubuntu 12.04 LTS

libssl1.0.0 - 1.0.1-4ubuntu5.11

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

References

• CVE-2013-4353
• CVE-2013-6449
• CVE-2013-6450