- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202007-56 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Claws Mail: Improper STARTTLS handling Date: July 28, 2020 Bugs: #733684 ID: 202007-56 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= A vulnerability was discovered in Claws Mail's STARTTLS handling, possibly allowing an integrity/confidentiality compromise. Background ========= Claws Mail is a GTK based e-mail client. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 mail-client/claws-mail < 3.17.6 >= 3.17.6 Description ========== It was discovered that Claws Mail was not properly handling state within the STARTTLS protocol handshake. Impact ===== There may be a breach of integrity or confidentiality in connections made using Claws Mail with STARTTLS. Workaround ========= There is no known workaround at this time. Resolution ========= All Claws Mail users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=mail-client/claws-mail-3.17.6" References ========= [ 1 ] CVE-2020-15917 https://nvd.nist.gov/vuln/detail/CVE-2020-15917 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202007-56 Concerns? ======== Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2020 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5