Ubuntu 2914-1: OpenSSL vulnerabilities

    Date01 Mar 2016
    CategoryUbuntu
    52
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in OpenSSL.
    ==========================================================================
    Ubuntu Security Notice USN-2914-1
    March 01, 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
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2914-1
      CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-0798,
      CVE-2016-0799
    
    Package Information:
      https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.4
      https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.18
      https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.35
    
    
    
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