Impact ------ 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 ------- 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. Workarounds ----------- 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. Links ----- https://github.com/blueman-project/blueman/releases/tag/2.1.4 https://nvd.nist.gov/vuln/detail/CVE-2020-15238 https://osint.geekcq.com/2020/10/27/cve-2020-15238/ https://bugs.launchpad.net/ubuntu/+source/blueman/+bug/1897287 Reproducible: Always
x86 stable
arm done
arm64 done
ppc/ppc64 stable
amd64 done all arches done
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=5e7942ca7449b477f3581a1ac4c8408db1c95746 commit 5e7942ca7449b477f3581a1ac4c8408db1c95746 Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2020-11-01 14:31:40 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2020-11-01 14:34:33 +0000 net-wireless/blueman: Remove old Bug: https://bugs.gentoo.org/751556 Signed-off-by: Michał Górny <mgorny@gentoo.org> net-wireless/blueman/Manifest | 1 - net-wireless/blueman/blueman-2.1.3.ebuild | 131 ------------------------------ 2 files changed, 132 deletions(-)
This issue was resolved and addressed in GLSA 202011-11 at https://security.gentoo.org/glsa/202011-11 by GLSA coordinator Sam James (sam_c).
