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    Ubuntu 4504-1: OpenSSL vulnerabilities

    Date
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    Several security issues were fixed in OpenSSL.
    ==========================================================================
    Ubuntu Security Notice USN-4504-1
    September 16, 2020
    
    openssl, openssl1.0 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in OpenSSL.
    
    Software Description:
    - openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools
    - openssl: Secure Socket Layer (SSL) cryptographic library and tools
    
    Details:
    
    Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky
    discovered that certain Diffie-Hellman ciphersuites in the TLS
    specification and implemented by OpenSSL contained a flaw. A remote
    attacker could possibly use this issue to eavesdrop on encrypted
    communications. This was fixed in this update by removing the insecure
    ciphersuites from OpenSSL. (CVE-2020-1968)
    
    Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin,
    Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL
    incorrectly handled ECDSA signatures. An attacker could possibly use this
    issue to perform a timing side-channel attack and recover private ECDSA
    keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1547)
    
    Guido Vranken discovered that OpenSSL incorrectly performed the x86_64
    Montgomery squaring procedure. While unlikely, a remote attacker could
    possibly use this issue to recover private keys. This issue only affected
    Ubuntu 18.04 LTS. (CVE-2019-1551)
    
    Bernd Edlinger discovered that OpenSSL incorrectly handled certain
    decryption functions. In certain scenarios, a remote attacker could
    possibly use this issue to perform a padding oracle attack and decrypt
    traffic. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1563)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      libssl1.0.0                     1.0.2n-1ubuntu5.4
    
    Ubuntu 16.04 LTS:
      libssl1.0.0                     1.0.2g-1ubuntu4.17
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4504-1
      CVE-2019-1547, CVE-2019-1551, CVE-2019-1563, CVE-2020-1968
    
    Package Information:
      https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.4
      https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.17
    
    

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