CVE-2020-27153

In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker could potentially cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

This flaw can be mitigated by only connecting the gatttool client to trusted GATT servers/devices. The flaw is in the service discovery which occurs after a Bluetoth Low Energy (BLE) connection has been established to a device. A secondary mitigation for this flaw is to disable bluetooth. Instructions on disabling bluetooth in Red Hat Enterprise Linux are available at: https://access.redhat.com/solutions/2682931