SB2021061630 - Ubuntu update for bluez

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Security features bypass (CVE-ID: CVE-2020-26558)

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to an impersonation in the Passkey Entry protocol flaw. A remote attacker on the local network can perform a man-in-the-middle (MITM) attack and impersonate the initiating device without any previous knowledge.

Note: This vulnerability affects the following specifications:

• BR/EDR Secure Simple Pairing in Bluetooth Core Specifications 2.1 through 5.2
• BR/EDR Secure Connections Pairing in Bluetooth Core Specifications 4.1 through 5.2 
• LE Secure Connections Pairing in Bluetooth Core Specifications 4.2 through 5.2

2) Double Free (CVE-ID: CVE-2020-27153)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker can cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.

3) Out-of-bounds read (CVE-ID: CVE-2021-3588)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the cli_feat_read_cb() function in src/gatt-database.c. A remote attacker on the local network can trigger an out-of-bounds read error and read contents of memory on the system.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-4989-1