USN-2385-1: OpenSSL vulnerabilities

16 October 2014

openssl vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software Description

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

Details

It was discovered that OpenSSL incorrectly handled memory when parsing DTLS SRTP extension data. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-3513)

It was discovered that OpenSSL incorrectly handled memory when verifying the integrity of a session ticket. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, resulting in a denial of service. (CVE-2014-3567)

In addition, this update introduces support for the TLS Fallback Signaling Cipher Suite Value (TLS_FALLBACK_SCSV). This new feature prevents protocol downgrade attacks when certain applications such as web browsers attempt to reconnect using a lower protocol version for interoperability reasons.

Update instructions

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

Ubuntu 14.04 LTS
libssl1.0.0 - 1.0.1f-1ubuntu2.7
Ubuntu 12.04 LTS
libssl1.0.0 - 1.0.1-4ubuntu5.20
Ubuntu 10.04 LTS
libssl0.9.8 - 0.9.8k-7ubuntu8.22

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