high
7.1
CWE
88 74
Advisory Published
Updated

CVE-2020-15238: Local privilege escalation Blueman

First published: Tue Oct 27 2020(Updated: )

Blueman is a GTK+ Bluetooth Manager. 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.

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
debian/blueman
2.0.8-1+deb10u1
2.1.4-1
2.3.5-2
2.3.5-3
Jenkins Brakeman<2.1.4
Debian=9.0
Debian=10.0
Fedora=31
Fedora=32
Fedora=33

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-15238?

    CVE-2020-15238 is considered to be a moderate severity vulnerability, as its impact heavily depends on the system configuration.

  • How do I fix CVE-2020-15238?

    To fix CVE-2020-15238, upgrade Blueman to version 2.1.4 or later.

  • Which versions of Blueman are affected by CVE-2020-15238?

    Versions of Blueman prior to 2.1.4 are affected by CVE-2020-15238.

  • What systems are susceptible to CVE-2020-15238?

    CVE-2020-15238 affects systems running Blueman with versions earlier than 2.1.4 and specific configurations, particularly when Polkit-1 is disabled.

  • What type of vulnerability is CVE-2020-15238?

    CVE-2020-15238 is an argument injection vulnerability in the DhcpClient method of the D-Bus interface of Blueman.

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