Debian: DSA-3828-2: dovecot regression update

    Date11 Apr 2017
    CategoryDebian
    54
    Posted ByLinuxSecurity Advisories
    The Dovecot update issued as DSA-3828-1 introduced a regression, this update reverts the backported patch. Further analysis by the Dovecot team has shown that only versions starting from 2.2.26 are affected. For reference, the original advisory text follows.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3828-2                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    April 11, 2017                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : dovecot
    
    The Dovecot update issued as DSA-3828-1 introduced a regression, this
    update reverts the backported patch. Further analysis by the Dovecot
    team has shown that only versions starting from 2.2.26 are affected. For
    reference, the original advisory text follows.
    
    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~deb8u3.
    
    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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