Date: Wed, 12 Feb 2020 14:05:02 +0200 From: Aki Tuomi <aki.tuomi@...ecot.fi> To: oss-security <oss-security@...ts.openwall.com>, full-disclosure <full-disclosure@...ts.openwall.com> Subject: CVE-2020-7046: Dovecot: Truncated UTF-8 can be used to DoS submission-login and lmtp processes 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: 188.8.131.52 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 184.108.40.206. Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)
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