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    Ubuntu 4376-2: OpenSSL vulnerabilities

    Date 09 Jul 2020
    444
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in OpenSSL.
    ==========================================================================
    Ubuntu Security Notice USN-4376-2
    July 09, 2020
    
    openssl vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in OpenSSL.
    
    Software Description:
    - openssl: Secure Socket Layer (SSL) cryptographic library and tools
    
    Details:
    
    USN-4376-1 fixed several vulnerabilities in OpenSSL. This update provides
    the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
    
    Original advisory details:
    
     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. (CVE-2019-1547)
    
     Juraj Somorovsky, Robert Merget, and Nimrod Aviram discovered that certain
     applications incorrectly used OpenSSL and could be exposed to a padding
     oracle attack. A remote attacker could possibly use this issue to decrypt
     data. (CVE-2019-1559)
    
     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. (CVE-2019-1563)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      libssl1.0.0                     1.0.1f-1ubuntu2.27+esm1
    
    Ubuntu 12.04 ESM:
      libssl1.0.0                     1.0.1-4ubuntu5.44
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4376-2
      https://usn.ubuntu.com/4376-1
      CVE-2019-1547, CVE-2019-1559, CVE-2019-1563
    

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