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    Ubuntu 4256-1: Cyrus SASL vulnerability

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    Cyrus SASL could be made to crash or execute arbitrary code if it received a specially crafted LDAP packet.
    ==========================================================================
    Ubuntu Security Notice USN-4256-1
    January 28, 2020
    
    cyrus-sasl2 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Cyrus SASL could be made to crash or execute arbitrary code if it received
    a specially crafted LDAP packet.
    
    Software Description:
    - cyrus-sasl2: Cyrus Simple Authentication and Security Layer
    
    Details:
    
    It was discovered that Cyrus SASL incorrectly handled certain LDAP packets.
    An attacker could possibly use this issue to execute arbitrary code or cause
    a denial of service.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.10:
      libsasl2-2                      2.1.27+dfsg-1ubuntu0.1
    
    Ubuntu 18.04 LTS:
      libsasl2-2                      2.1.27~101-g0780600+dfsg-3ubuntu2.1
    
    Ubuntu 16.04 LTS:
      libsasl2-2                      2.1.26.dfsg1-14ubuntu0.2
    
    Ubuntu 14.04 ESM:
      libsasl2-2                      2.1.25.dfsg1-17ubuntu0.1~esm1
    
    Ubuntu 12.04 ESM:
      libsasl2-2                      2.1.25.dfsg1-3ubuntu0.2
    
    After a standard system update you need to restart services using
    SASL to effect the necessary changes.
    
    References:
      https://usn.ubuntu.com/4256-1
      CVE-2019-19906
    
    Package Information:
      https://launchpad.net/ubuntu/+source/cyrus-sasl2/2.1.27+dfsg-1ubuntu0.1
      https://launchpad.net/ubuntu/+source/cyrus-sasl2/2.1.27~101-g0780600+dfsg-3ubuntu2.1
      https://launchpad.net/ubuntu/+source/cyrus-sasl2/2.1.26.dfsg1-14ubuntu0.2
    

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