CVE-2020-12100: Parsing mails with a large number of MIME parts could have resulted in excessive CPU usage or a crash due to running out of stack memory. CVE-2020-12673: Dovecot's NTLM implementation does not correctly check message buffer size, which leads to reading past allocation which can lead to crash. CVE-2020-10967: lmtp/submission:
Issuing the RCPT command with an address that has the empty quoted string as local-part causes the lmtp service to crash. CVE-2020-12674:
Dovecot's RPA mechanism implementation accepts zero-length message, which leads to assert-crash later on.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has dovecot packages installed that are affected by multiple vulnerabilities:

  - 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. (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. (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 Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4456-1 advisory.

    It was discovered that Dovecot incorrectly handled deeply nested MIME parts. A remote attacker could     possibly use this issue to cause Dovecot to consume resources, resulting in a denial of service.
    (CVE-2020-12100)

    It was discovered that Dovecot incorrectly handled memory when using NTLM. A remote attacker could     possibly use this issue to cause Dovecot to crash, resulting in a denial of service. (CVE-2020-12673)

    It was discovered that the Dovecot RPA mechanism incorrectly handled zero-length messages. A remote     attacker could possibly use this issue to cause Dovecot to crash, resulting in a denial of service.
    (CVE-2020-12674)

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

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

This update for dovecot23 fixes the following issues :

CVE-2020-12673: improper implementation of NTLM does not check message buffer size (bsc#1174922).

CVE-2020-12674: improper implementation of RPA mechanism (bsc#1174923).

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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3617 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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
140232	Fedora 31 : 1:dovecot (2020-cd8b8f887b)	Nessus	Fedora Local Security Checks	2020/9/4	2024/2/22	high
147381	NewStart CGSL CORE 5.04 / MAIN 5.04 : dovecot Multiple Vulnerabilities (NS-SA-2021-0041)	Nessus	NewStart CGSL Local Security Checks	2021/3/10	2024/1/11	high
139553	Debian DSA-4745-1 : dovecot - security update	Nessus	Debian Local Security Checks	2020/8/13	2024/2/26	high
139567	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Dovecot vulnerabilities (USN-4456-1)	Nessus	Ubuntu Local Security Checks	2020/8/13	2024/8/29	high
139689	SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2020:2267-1)	Nessus	SuSE Local Security Checks	2020/8/19	2024/2/23	high
140204	RHEL 7 : dovecot (RHSA-2020:3617)	Nessus	Red Hat Local Security Checks	2020/9/3	2024/11/7	high

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