Linux Security
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    Linux Security

    Ubuntu 4566-1: Cyrus IMAP Server vulnerabilities

    Date 06 Oct 2020
    112
    Posted By LinuxSecurity Advisories
    Cyrus IMAP Server could be made to overwrite files as the administrator.
    ==========================================================================
    Ubuntu Security Notice USN-4566-1
    October 05, 2020
    
    cyrus-imapd vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    Cyrus IMAP Server could be made to overwrite files as the administrator.
    
    Software Description:
    - cyrus-imapd: An IMAP server
    
    Details:
    
    It was dicovered that Cyrus IMAP Server could execute arbitrary code via a
    crafted HTTP PUT operation for an event with a long iCalendar property name.
    An attacker could use this vulnerability to cause a crash or possibly execute
    arbitrary code. (CVE-2019-11356)
    
    It was discovered that the Cyrus IMAP Server allow users to create any
    mailbox with administrative privileges. A local attacker could use this to
    obtain sensitive information. (CVE-2019-19783)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      cyrus-admin                     2.5.10-3ubuntu1.1
      cyrus-caldav                    2.5.10-3ubuntu1.1
      cyrus-common                    2.5.10-3ubuntu1.1
      cyrus-imapd                     2.5.10-3ubuntu1.1
      cyrus-replication               2.5.10-3ubuntu1.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4566-1
      CVE-2019-11356, CVE-2019-19783
    
    Package Information:
      https://launchpad.net/ubuntu/+source/cyrus-imapd/2.5.10-3ubuntu1.1
    

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