February 2020 - Dovecot-news

CVE-2020-7046: Truncated UTF-8 can be used to DoS submission-login and lmtp processes
by Aki Tuomi 12 Feb '20

12 Feb '20

Open-Xchange Security Advisory 2020-02-12 Affected product: Dovecot Core Internal reference: DOV-3744 (JIRA ID) Vulnerability type: Improper Input Validation (CWE-30) Vulnerable version: 2.3.9 Vulnerable component: submission-login, lmtp Fixed version: 2.3.9.3 Report confidence: Confirmed Solution status: Fixed Researcher credits: Open-Xchange oy Vendor notification: 2020-01-14 CVE reference: CVE-2020-7046 CVSS: 7.5 (CVSS3.1:AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Vulnerability Details: lib-smtp doesn't handle truncated command parameters properly, resulting in infinite loop taking 100% CPU for the process. This happens for LMTP (where it doesn't matter so much) and also for submission-login where unauthenticated users can trigger it. Risk: Attacker can cause submission-login and lmtp processes to be exhausted, leading into denial of service and CPU resource exhaustion. Solution: Upgrade to 2.3.9.3.

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CVE-2020-7957: Specially crafted mail can crash snippet generation
by Aki Tuomi 12 Feb '20

12 Feb '20

Open-Xchange Security Advisory 2020-02-12 Affected product: Dovecot Core Internal reference: DOV-3743 (JIRA ID) Vulnerability type: Improper Input Validation (CWE-30) Vulnerable version: 2.3.9 Vulnerable component: lmtp, imap Fixed version: 2.3.9.3 Report confidence: Confirmed Solution status: Fixed Researcher credits: Open-Xchange oy Vendor notification: 2020-01-14 CVE reference: CVE-2020-7957 CVSS: 3.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L) Vulnerability Details: Snippet generation crashes if: message is large enough that message-parser returns multiple body blocks The first block(s) don't contain the full snippet (e.g. full of whitespace) input ends with '>' Risk: Sending specially crafted email can cause mailbox to have permanently unaccessible mail, or the mail can be stuck in delivery. Solution: Upgrade to 2.3.9.3

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Dovecot v2.3.9.3 released
by Aki Tuomi 12 Feb '20

12 Feb '20

We are pleased to release v2.3.9.3 of Dovecot. Please find it from locations below https://dovecot.org/releases/2.3/dovecot-2.3.9.3.tar.gz https://dovecot.org/releases/2.3/dovecot-2.3.9.3.tar.gz.sig Binary packages in https://repo.dovecot.org/ Docker images in https://hub.docker.com/r/dovecot/dovecot --- v2.3.9.3 2019-02-12 Aki Tuomi <aki.tuomi(a)open-xchange.com> * CVE-2020-7046: Truncated UTF-8 can be used to DoS submission-login and lmtp processes. * CVE-2020-7957: Specially crafted mail can crash snippet generation.

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