Debian: DSA-3828-1: dovecot security update

    Date 10 Apr 2017
    110
    Posted By LinuxSecurity Advisories
    It was discovered that the Dovecot email server is vulnerable to a denial of service attack. When the "dict" passdb and userdb are used for user authentication, the username sent by the IMAP/POP3 client is sent through var_expand() to perform %variable expansion. Sending
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3828-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    April 10, 2017                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : dovecot
    CVE ID         : CVE-2017-2669
    Debian Bug     : 860049
    
    It was discovered that the Dovecot email server is vulnerable to a
    denial of service attack. When the "dict" passdb and userdb are used
    for user authentication, the username sent by the IMAP/POP3 client is
    sent through var_expand() to perform %variable expansion. Sending
    specially crafted %variable fields could result in excessive memory
    usage causing the process to crash (and restart).
    
    For the stable distribution (jessie), this problem has been fixed in
    version 1:2.2.13-12~deb8u2.
    
    We recommend that you upgrade your dovecot packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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