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Vulnerability · Published Oct 27, 2020 · Assigned by GitHub_M

CVE-2020-15238Local privilege escalation Blueman

High 7.1

In plain English

A high-severity injection in blueman from blueman-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.6% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High
Exploit odds (30 days)4.6%top 8.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12blueman2.1.4-1DEBIAN-CVE-2020-15238
Debian:13blueman2.1.4-1DEBIAN-CVE-2020-15238
Debian:14blueman2.1.4-1DEBIAN-CVE-2020-15238

Affected products (as reported)

VendorProductVersions
blueman-project blueman < 2.1.4

Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L

References