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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3269 USN-4110-1-4: Dovecot vulnerability - regression 29 August 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Dovecot Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-11500 Reference: ESB-2019.3261 Original Bulletin: https://usn.ubuntu.com/4110-1/ https://usn.ubuntu.com/4110-2/ https://usn.ubuntu.com/4110-3/ https://usn.ubuntu.com/4110-4/ Comment: This bulletin contains four (4) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4110-1: Dovecot vulnerability 28 August 2019 dovecot vulnerability A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.04 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary Dovecot could be made to crash or execute arbitrary code if it received a specially crafted data. Software Description o dovecot - IMAP and POP3 email server Details Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04 dovecot-core - 1:2.3.4.1-1ubuntu2.3 Ubuntu 18.04 LTS dovecot-core - 1:2.2.33.2-1ubuntu4.4 Ubuntu 16.04 LTS dovecot-core - 1:2.2.22-1ubuntu2.11 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-2019-11500 - ----------------------------------------------------------------------------- USN-4110-2: Dovecot vulnerability 28 August 2019 dovecot vulnerability A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 14.04 ESM o Ubuntu 12.04 ESM Summary Dovecot could be made to crash or execute arbitrary code if it received a specially crafted data. Software Description o dovecot - IMAP and POP3 email server Details USN-4110-1 fixed a vulnerability in Dovecot. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. Original advisory details: Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM dovecot-core - 1:2.2.9-1ubuntu2.6+esm1 Ubuntu 12.04 ESM dovecot-core - 1:2.0.19-0ubuntu2.7 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 USN-4110-1 o CVE-2019-11500 - ---------------------------------------------------------------------------- USN-4110-3: Dovecot regression 28 August 2019 Dovecot regression A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.04 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary USN-4110-1 introduced a regression in Dovecot. Software Description o dovecot - IMAP and POP3 email server Details USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a regression causing a wrong check. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04 dovecot-core - 1:2.3.4.1-1ubuntu2.4 Ubuntu 18.04 LTS dovecot-core - 1:2.2.33.2-1ubuntu4.5 Ubuntu 16.04 LTS dovecot-core - 1:2.2.22-1ubuntu2.12 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 USN-4110-1 o CVE-2019-11500 - ----------------------------------------------------------------------------- USN-4110-4: Dovecot regression 28 August 2019 dovecot regression A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 14.04 ESM o Ubuntu 12.04 ESM Summary USN-4110-1 introduced a regression in Dovecot. Software Description o dovecot - IMAP and POP3 email server Details USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a regression causing a wrong check. This update fixes the problem for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. We apologize for the inconvenience. Original advisory details: Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM dovecot-core - 1:2.2.9-1ubuntu2.6+esm2 Ubuntu 12.04 ESM dovecot-core - 1:2.0.19-0ubuntu2.8 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 USN-4110-1 o CVE-2019-11500 - ----------------------------------------------------------------------------- - --------------------------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). 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