Linux Security
    Linux Security
    Linux Security

    ArchLinux: 202012-12: blueman: privilege escalation

    Date 17 Dec 2020
    200
    Posted By LinuxSecurity Advisories
    The package blueman before version 2.1.4-1 is vulnerable to privilege escalation.
    Arch Linux Security Advisory ASA-202012-12
    ==========================================
    
    Severity: High
    Date    : 2020-12-09
    CVE-ID  : CVE-2020-15238
    Package : blueman
    Type    : privilege escalation
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1259
    
    Summary
    =======
    
    The package blueman before version 2.1.4-1 is vulnerable to privilege
    escalation.
    
    Resolution
    ==========
    
    Upgrade to 2.1.4-1.
    
    # pacman -Syu "blueman>=2.1.4-1"
    
    The problem has been fixed upstream in version 2.1.4.
    
    Workaround
    ==========
    
    As Polkit-1-support is enabled in Arch, it is possible to limit
    privileges for the `org.blueman.dhcp.client` action to users that are
    able to run arbitrary commands as root anyway in
    /usr/share/polkit-1/rules.d/blueman.rules.
    
    Description
    ===========
    
    In Blueman before 2.1.4, the DhcpClient method of the D-Bus interface
    to blueman-mechanism is prone to an argument injection vulnerability.
    The impact highly depends on the system configuration. If Polkit-1 is
    disabled and for versions lower than 2.0.6, any local user can possibly
    exploit this. If Polkit-1 is enabled for version 2.0.6 and later, a
    possible attacker needs to be allowed to use the
    `org.blueman.dhcp.client` action. That is limited to users in the wheel
    group in the shipped rules file that do have the privileges anyway. On
    systems with ISC DHCP client (dhclient), attackers can pass arguments
    to `ip link` with the interface name that can e.g. be used to bring
    down an interface or add an arbitrary XDP/BPF program. On systems with
    dhcpcd and without ISC DHCP client, attackers can even run arbitrary
    scripts by passing `-c/path/to/script` as an interface name. Patches
    are included in 2.1.4 and master that change the DhcpClient D-Bus
    method(s) to accept BlueZ network object paths instead of network
    interface names. A backport to 2.0(.8) is also available. As a
    workaround, make sure that Polkit-1-support is enabled and limit
    privileges for the `org.blueman.dhcp.client` action to users that are
    able to run arbitrary commands as root anyway in
    /usr/share/polkit-1/rules.d/blueman.rules.
    
    Impact
    ======
    
    A local attacker might be able to escalate privileges.
    
    References
    ==========
    
    https://bugs.archlinux.org/task/68563
    https://github.com/blueman-project/blueman/security/advisories/GHSA-jpc9-mgw6-2xwx
    https://bugs.launchpad.net/ubuntu/+source/blueman/+bug/1897287
    https://security.archlinux.org/CVE-2020-15238
    

    Advisories

    LinuxSecurity Poll

    'Tis the season of giving! How have you given back to the open-source community?

    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).
    /main-polls/49-tis-the-season-of-giving-how-have-you-given-back-to-the-open-source-community?task=poll.vote&format=json
    49
    radio
    [{"id":"171","title":"I've contributed to the development of an open-source project.","votes":"22","type":"x","order":"1","pct":34.92,"resources":[]},{"id":"172","title":"I've reviewed open-source code for security bugs.","votes":"13","type":"x","order":"2","pct":20.63,"resources":[]},{"id":"173","title":"I've made a donation to an open-source project.","votes":"28","type":"x","order":"3","pct":44.44,"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

    Please vote first in order to view vote results.


    VIEW MORE POLLS

    bottom 200

    Please enable / Bitte aktiviere JavaScript!
    Veuillez activer / Por favor activa el Javascript![ ? ]

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