CVE-2017-2669

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    CVE-2017-2669

    Published: 21 Jun 2018Last Modified: 8 Jul 2026

    Summary:

    Details: Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was 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), or excessive CPU usage causing all authentications to hang.

    References: http://www.openwall.com/lists/oss-security/2017/04/11/1, http://www.securityfocus.com/bid/97536, https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html, https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch, https://www.debian.org/security/2017/dsa-3828, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 54d654098032d96975b70749b505fae538e97f7a
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High