Vulnerabilities > CVE-2019-10691
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.
Vulnerable Configurations
Nessus
NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_A64AA22F61EC11E985B9A4BADB296695.NASL description Aki Tuomi reports : * CVE-2019-10691: Trying to login with 8bit username containing invalid UTF8 input causes auth process to crash if auth policy is enabled. This could be used rather easily to cause a DoS. Similar crash also happens during mail delivery when using invalid UTF8 in From or Subject header when OX push notification driver is used. last seen 2020-06-01 modified 2020-06-02 plugin id 124183 published 2019-04-19 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124183 title FreeBSD : dovecot -- json encoder crash (a64aa22f-61ec-11e9-85b9-a4badb296695) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-0997-1.NASL description This update for dovecot23 fixes the following issues : Security issue fixed : CVE-2019-10691: Fixed a denial of service via reachable assertion when processing invalid UTF-8 characters (bsc#1132501). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 124270 published 2019-04-24 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124270 title SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2019:0997-1) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201908-29.NASL description The remote host is affected by the vulnerability described in GLSA-201908-29 (Dovecot: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in Dovecot. Please review the CVE identifiers referenced below for details. Impact : An unauthenticated remote attacker could send a specially crafted mail or use crafted IMAP commands possibly resulting in the execution of arbitrary code with the privileges of the process or a Denial of Service condition. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 128444 published 2019-09-03 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128444 title GLSA-201908-29 : Dovecot: Multiple vulnerabilities NASL family Huawei Local Security Checks NASL id EULEROS_SA-2019-1644.NASL description According to the versions of the dovecot packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - In Dovecot before 2.2.36.3 and 2.3.x before 2.3.5.1, a local attacker can cause a buffer overflow in the indexer-worker process, which can be used to elevate to root. This occurs because of missing checks in the fts and pop3-uidl components.(CVE-2019-7524) - The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.(CVE-2019-10691) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-03 modified 2019-06-27 plugin id 126271 published 2019-06-27 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/126271 title EulerOS 2.0 SP8 : dovecot (EulerOS-SA-2019-1644) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-3951-1.NASL description It was discovered that the Dovecot JSON encoder incorrectly handled certain invalid UTF-8 characters. A remote attacker could possibly use this issue to cause Dovecot to repeatedly crash, resulting in a denial of service. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 124273 published 2019-04-24 reporter Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124273 title Ubuntu 18.10 / 19.04 : dovecot vulnerability (USN-3951-1) NASL family SuSE Local Security Checks NASL id OPENSUSE-2019-1312.NASL description This update for dovecot23 fixes the following issues : Security issue fixed : - CVE-2019-10691: Fixed a denial of service via reachable assertion when processing invalid UTF-8 characters (bsc#1132501). This update was imported from the SUSE:SLE-15:Update update project. last seen 2020-06-01 modified 2020-06-02 plugin id 124581 published 2019-05-03 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124581 title openSUSE Security Update : dovecot23 (openSUSE-2019-1312)
References
- https://dovecot.org/list/dovecot-news/2019-April/000406.html
- http://www.openwall.com/lists/oss-security/2019/04/18/3
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00000.html
- https://security.gentoo.org/glsa/201908-29
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QHFZ5OWRIZGIWZJ5PTNVWWZNLLNH4XYS/