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Ubuntu Security Notice USN-6334-1
September 04, 2023

atftp vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in atftp.

Software Description:
- atftp: Advanced TFTP Server and Client

Details:

Peter Wang discovered that atftp did not properly manage certain inputs. A
remote attacker could send a specially crafted tftp request to the server
to cause a crash. (CVE-2020-6097)

Andreas B. Mundt discovered that atftp did not properly manage certain
inputs. A remote attacker could send a specially crafted tftp request to
the server to cause a crash. (CVE-2021-41054)

Johannes Krupp discovered that atftp did not properly manage certain
inputs. A remote attacker could send a specially crafted tftp request to
the server and make the server to disclose /etc/group data.
(CVE-2021-46671)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
   atftpd                          0.7.git20120829-3.1ubuntu0.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   atftpd 0.7.git20120829-3.1~0.18.04.1+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   atftpd 0.7.git20120829-3.1~0.16.04.1+esm1

In general, a standard system update will make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6334-1
   CVE-2020-6097, CVE-2021-41054, CVE-2021-46671

Package Information:
https://launchpad.net/ubuntu/+source/atftp/0.7.git20120829-3.1ubuntu0.1