SB2023090431 - Ubuntu update for atftp

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Reachable Assertion (CVE-ID: CVE-2020-6097)

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

The vulnerability exists due to a reachable assertion in the atftpd daemon functionality. A remote attacker can use a specially crafted sequence of RRQ-Multicast requests to trigger an assert() call and cause a denial of service conditon on the target system.

2) Buffer overflow (CVE-ID: CVE-2021-41054)

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

The vulnerability exists due to a boundary in tftpd_file.c. A remote attacker can send specially crafted data to the server, trigger memory corruption and perform a denial of service (DoS) attack.

3) Out-of-bounds read (CVE-ID: CVE-2021-46671)

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

The vulnerability exists due to a boundary condition in options.c. A remote attacker can create a specially data to the application, 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-6334-1