ArchLinux: 201905-6: dovecot: denial of service

    Date07 May 2019
    CategoryArchLinux
    237
    Posted ByLinuxSecurity Advisories
    The package dovecot before version 2.3.6-1 is vulnerable to denial of service.
    Arch Linux Security Advisory ASA-201905-6
    =========================================
    
    Severity: Medium
    Date    : 2019-05-06
    CVE-ID  : CVE-2019-11494 CVE-2019-11499
    Package : dovecot
    Type    : denial of service
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-954
    
    Summary
    =======
    
    The package dovecot before version 2.3.6-1 is vulnerable to denial of
    service.
    
    Resolution
    ==========
    
    Upgrade to 2.3.6-1.
    
    # pacman -Syu "dovecot>=2.3.6-1"
    
    The problems have been fixed upstream in version 2.3.6.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2019-11494 (denial of service)
    
    Submission-login crashes with signal 11 due to null pointer access when
    authentication is aborted by disconnecting. This can lead to denial-of
    service attack by persistent attacker(s).
    
    - CVE-2019-11499 (denial of service)
    
    Submission-login crashes when authentication is started over TLS
    secured channel and invalid authentication message is sent. This can
    lead to denial-of-service attack by persistent attacker(s).
    
    Impact
    ======
    
    A remote attacker is able to cause a denial of service by sending
    invalid authentication messages or aborting the authentication process.
    
    References
    ==========
    
    https://dovecot.org/doc/NEWS-2.3
    https://www.mail-archive.com/This email address is being protected from spambots. You need JavaScript enabled to view it./msg06126.html
    https://dovecot.org/pipermail/dovecot/2019-April/115757.html
    https://dovecot.org/pipermail/dovecot/2019-April/115758.html
    https://security.archlinux.org/CVE-2019-11494
    https://security.archlinux.org/CVE-2019-11499
    
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