ArchLinux: 202002-6: dovecot: denial of service

    Date13 Feb 2020
    312
    Posted ByLinuxSecurity Advisories
    The package dovecot before version 2.3.9.3-1 is vulnerable to denial of service.
    Arch Linux Security Advisory ASA-202002-6
    =========================================
    
    Severity: Medium
    Date    : 2020-02-12
    CVE-ID  : CVE-2020-7046 CVE-2020-7957
    Package : dovecot
    Type    : denial of service
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1097
    
    Summary
    =======
    
    The package dovecot before version 2.3.9.3-1 is vulnerable to denial of
    service.
    
    Resolution
    ==========
    
    Upgrade to 2.3.9.3-1.
    
    # pacman -Syu "dovecot>=2.3.9.3-1"
    
    The problems have been fixed upstream in version 2.3.9.3.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2020-7046 (denial of service)
    
    A denial of service has been found in Dovecot before 2.3.9.3, where
    lib-smtp doesn't handle truncated command parameters properly,
    resulting in infinite loop taking 100% CPU for the process. This
    happens for LMTP (where it doesn't matter so much) and also for
    submission-login where unauthenticated users can trigger it.
    
    - CVE-2020-7957 (denial of service)
    
    A denial of service have been found in Dovecot before 2.3.9.3, where a
    specially crafted e-mail can cause a mailbox to have permanently
    inaccessible mail, or the e-mail itself can be stuck in delivery. This
    happens because the snippet generation crashes if a message is large
    enough that message-parser returns multiple body blocks, the first
    block(s) don't contain the full snippet (e.g. full of whitespace) and
    the input ends with '>'.
    
    Impact
    ======
    
    A remote, unauthenticated user can cause a denial of service via a
    crafted message.
    
    References
    ==========
    
    https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html
    https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html
    https://security.archlinux.org/CVE-2020-7046
    https://security.archlinux.org/CVE-2020-7957
    
    

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