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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0431 USN-4268-1: OpenSMTPD vulnerability 6 February 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenSMTPD Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Remote/Unauthenticated Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-7247 Reference: ESB-2020.0336 Original Bulletin: https://usn.ubuntu.com/4268-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4268-1: OpenSMTPD vulnerability 5 February 2020 OpenSMTPD vulnerability A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.10 o Ubuntu 18.04 LTS Summary OpenSMTPD could be made to run programs as root if it received specially crafted input over the network. Software Description o opensmtpd - secure, reliable, lean, and easy-to configure SMTP server Details It was discovered that OpenSMTPD incorrectly verified the sender's or receiver's e-mail addresses under certain conditions. An attacker could use this vulnerability to execute arbitrary commands as root. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10 opensmtpd - 6.0.3p1-6ubuntu0.1 Ubuntu 18.04 LTS opensmtpd - 6.0.3p1-1ubuntu0.1 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . In general, a standard system update will make all the necessary changes. References o CVE-2020-7247 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXjuul2aOgq3Tt24GAQjPzw/+PQe3dW6O/LB3hrLqzao5Ai0bhl0T4YS8 eA0LmmJVQc6yjdrI/7i/0n3tmaYTQd1Msf5y5kBsgtKajxhFSa16XLYVI/u9cI49 Pd2iTFM8jX+DmlE0W6mhRRlu70o7rW995AAQbN5zqlTLvA+0y18JHQEKNNcWUNfZ 3y7fgNWdlEUhCSVKfOq3RlAKfdEGNitDxNx4L+0AHVpnkzSnEixLr9eWAkNhT+0L ADQNAmcAE5DmhglT2v/+B1Gloq75TUfANSfrpaXTkLzrYfVpW6/NOTLSUZ1NQLtK Hu5f/sR7N3xxr0qkUmdu6F+t0V0lil9Wu9whBb4KqF1DW+iqM9mVGYoHY4O8Oh3+ WDKHoBxh+mmcDys+q59JNVGVmTCWEfLxyWciMAo96fEvArSe6e3tlKVaEmiBUxaY 9R95DQbB7FEwEigVb5szGd7ufbZ9cG+85Kk4LtoPNg1XirzguTH+5gO6O6vizxe8 R58kTrCXWJ6S2tPuwJYBBQpJGFsoyHAzztHA82xo5kShweuMPZwYt77Hl3Z8GeMX fOCnKn65nWi53Bn7hoFC4YUUaK83zRSIvGeYgM0v6a5PaI6SGz/fPaDibr6pyiG3 Krj1JvMbkFDFrHYMBTkdhZFKW7RMGtjNqAHYdpJN7q/Q5P7eY2A1XoKXmK5zVxKd I+Y0Kl+eeAg= =NlIE -----END PGP SIGNATURE-----