Several vulnerabilities have been discovered in the Dovecot email server.

CVE-2020-12100

Receiving mail with deeply nested MIME parts leads to resource exhaustion as Dovecot attempts to parse it.

CVE-2020-12673

Dovecot's NTLM implementation does not correctly check message buffer size, which leads to a crash when reading past allocation.

CVE-2020-12674

Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on.

For Debian 9 stretch, these problems have been fixed in version 1:2.2.27-3+deb9u6.

We recommend that you upgrade your dovecot packages.

For the detailed security status of dovecot please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/dovecot

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2020-546:03 advisory.

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)
      * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)
      * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2020-288:02 advisory.

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)
      * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)
      * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3736 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: Resource exhaustion via deeply nested MIME parts (CVE-2020-12100)

    * dovecot: Out of bound reads in dovecot NTLM implementation (CVE-2020-12673)

    * dovecot: Crash due to assert in RPA implementation (CVE-2020-12674)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of dovecot installed on the remote host is prior to 2.2.36-6. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1489 advisory.

    In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because     a length of zero is mishandled. A flaw was found in dovecot. An attacker can use the way dovecot handles     RPA (Remote Passphrase Authentication) to crash the authentication process repeatedly preventing login.
    The highest threat from this vulnerability is to system availability. (CVE-2020-12674)

    In Dovecot before 2.3.11.3, uncontrolled recursion in submission, lmtp, and lda allows remote attackers to     cause a denial of service (resource consumption) via a crafted e-mail message with deeply nested MIME     parts. A flaw was found in dovecot. A remote attacker could cause a denial of service by repeatedly     sending emails containing MIME parts containing malicious content of which dovecot will attempt to parse.
    The highest threat from this vulnerability is to system availability. (CVE-2020-12100)

    In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because     of an out-of-bounds read. A flaw was found in dovecot. An out-of-bounds read flaw was found in the way     dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly     preventing login. The highest threat from this vulnerability is to system availability. (CVE-2020-12673)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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 2.3.11.3, sending a specially     formatted NTLM request will crash the auth service     because of an out-of-bounds read.(CVE-2020-12673)

  - In Dovecot before 2.3.11.3, sending a specially     formatted RPA request will crash the auth service     because a length of zero is mishandled.(CVE-2020-12674)

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
139626	Debian DLA-2328-1 : dovecot security update	Nessus	Debian Local Security Checks	2020/8/18	2024/2/26	high
294138	MiracleLinux 8 : dovecot-2.3.8-2.el8.2 (AXSA:2020-546:03)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
294188	MiracleLinux 7 : dovecot-2.2.36-6.el7.1 (AXSA:2020-288:02)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
140582	RHEL 8 : dovecot (RHSA-2020:3736)	Nessus	Red Hat Local Security Checks	2020/9/14	2024/11/7	high
140636	Amazon Linux 2 : dovecot (ALAS-2020-1489)	Nessus	Amazon Linux Local Security Checks	2020/9/17	2024/12/11	high
140884	EulerOS 2.0 SP3 : dovecot (EulerOS-SA-2020-2117)	Nessus	Huawei Local Security Checks	2020/9/28	2024/2/19	high

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