USN-2914-1: OpenSSL vulnerabilities

1 March 2016

openssl vulnerabilities

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

  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software Description

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

Details

Yuval Yarom, Daniel Genkin, and Nadia Heninger discovered that OpenSSL was vulnerable to a side-channel attack on modular exponentiation. On certain CPUs, a local attacker could possibly use this issue to recover RSA keys. This flaw is known as CacheBleed. (CVE-2016-0702)

Adam Langley discovered that OpenSSL incorrectly handled memory when parsing DSA private keys. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-0705)

Guido Vranken discovered that OpenSSL incorrectly handled hex digit calculation in the BN_hex2bn function. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-0797)

Emilia Käsper discovered that OpenSSL incorrectly handled memory when performing SRP user database lookups. A remote attacker could possibly use this issue to cause OpenSSL to consume memory, resulting in a denial of service. (CVE-2016-0798)

Guido Vranken discovered that OpenSSL incorrectly handled memory when printing very long strings. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-0799)

Update instructions

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

Ubuntu 15.10
libssl1.0.0 - 1.0.2d-0ubuntu1.4
Ubuntu 14.04 LTS
libssl1.0.0 - 1.0.1f-1ubuntu2.18
Ubuntu 12.04 LTS
libssl1.0.0 - 1.0.1-4ubuntu5.35

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