ArchLinux: 201906-16: dbus: access restriction bypass

    Date19 Jun 2019
    CategoryArchLinux
    404
    Posted ByLinuxSecurity Advisories
    The package dbus before version 1.12.16-1 is vulnerable to access restriction bypass.
    Arch Linux Security Advisory ASA-201906-16
    ==========================================
    
    Severity: High
    Date    : 2019-06-18
    CVE-ID  : CVE-2019-12749
    Package : dbus
    Type    : access restriction bypass
    Remote  : No
    Link    : https://security.archlinux.org/AVG-974
    
    Summary
    =======
    
    The package dbus before version 1.12.16-1 is vulnerable to access
    restriction bypass.
    
    Resolution
    ==========
    
    Upgrade to 1.12.16-1.
    
    # pacman -Syu "dbus>=1.12.16-1"
    
    The problem has been fixed upstream in version 1.12.16.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    It has been discovered that dbus before 1.12.16 allows cookie spoofing
    because of symlink mishandling in the reference implementation of
    DBUS_COOKIE_SHA1 in the libdbus library. This issue only affects the
    DBUS_COOKIE_SHA1 authentication mechanism.
    A malicious client with write access to its own home directory could
    manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a
    different uid to read and write in unintended locations. In the worst
    case, this could result in the DBusServer reusing a cookie that is
    known to the malicious client, and treating that cookie as evidence
    that a subsequent client connection came from an attacker-chosen uid,
    allowing authentication bypass.
    
    Impact
    ======
    
    A local attacker could use this issue to bypass authentication and
    escalate privileges.
    
    References
    ==========
    
    https://www.openwall.com/lists/oss-security/2019/06/11/2
    https://gitlab.freedesktop.org/dbus/dbus/issues/269
    https://gitlab.freedesktop.org/dbus/dbus/commit/47b1a4c41004bf494b87370987b222c934b19016
    https://security.archlinux.org/CVE-2019-12749
    
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    Do you read our distribution advisories on a regular basis?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    /component/communitypolls/?task=poll.vote&format=json
    23
    radio
    [{"id":"84","title":"Yes, for a single distribution","votes":"0","type":"x","order":"1","pct":0,"resources":[]},{"id":"85","title":"Yes, for multiple distributions","votes":"5","type":"x","order":"2","pct":62.5,"resources":[]},{"id":"86","title":"No","votes":"3","type":"x","order":"3","pct":37.5,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    Advisories

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.