The remote host is affected by the vulnerability described in GLSA-202101-01 (Dovecot: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Dovecot. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could send a specially crafted mail or send a       specially crafted IMAP command possibly resulting in a Denial of Service       condition or an authenticated remote attacker might be able to discover       the file system directory structure and access other users&rsquo; emails.
  Workaround :

    The information disclosure vulnerability can be mitigated by disabling       IMAP hibernation feature which isn&rsquo;t enabled by default.

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2021-2023:02 advisory.

    * dovecot: IMAP hibernation function allows mail access (CVE-2020-24386)
      * dovecot: Denial of service via mail MIME parsing (CVE-2020-25275)

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.

This update for dovecot23 fixes the following issues :

Security issues fixed :

CVE-2020-12100: Fixed a resource exhaustion caused by deeply nested MIME parts (bsc#1174920).

CVE-2020-12673: Fixed an improper implementation of NTLM that did not check the message buffer size (bsc#1174922).

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

CVE-2020-24386: Fixed an issue with IMAP hibernation that allowed users to access other users' emails (bsc#1180405).

CVE-2020-25275: Fixed a crash when the 10000th MIME part was message/rfc822 (bsc#1180406).

Non-security issues fixed :

Pigeonhole was updated to version 0.5.11.

Dovecot was updated to version 2.3.11.3.

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.

This update for dovecot23 fixes the following issues :

Security issues fixed :

CVE-2020-12100: Fixed a resource exhaustion caused by deeply nested MIME parts (bsc#1174920).

CVE-2020-24386: Fixed an issue with IMAP hibernation that allowed users to access other users' emails (bsc#1180405).

CVE-2020-25275: Fixed a crash when the 10000th MIME part was message/rfc822 (bsc#1180406).

Non-security issues fixed :

Pigeonhole was updated to version 0.5.11.

Dovecot was updated to version 2.3.11.3.

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 CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1887 advisory.

  - dovecot: IMAP hibernation function allows mail access (CVE-2020-24386)

  - dovecot: Denial of service via mail MIME parsing (CVE-2020-25275)

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

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0115 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2019-11500:
    In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2), protocol processing     can fail for quoted strings. This occurs because '\0' characters are mishandled, and can lead to out-of-     bounds writes and remote code execution.

    CVE-2019-3814:
    It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client     certificates. A remote attacker in possession of a valid certificate with an empty username field could     possibly use this issue to impersonate other users.

    CVE-2020-10957:
    In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a     NULL Pointer Dereference and crash in submission-login, submission, or lmtp.

    CVE-2020-10958:
    In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in     submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines     after a command.

    CVE-2020-10967:
    In Dovecot before 2.3.10.1, remote unauthenticated attackers can crash the lmtp or submission process by     sending mail with an empty localpart.

    CVE-2020-12100:
    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-2020-12673:
    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-2020-12674:
    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-2020-24386:
    An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can     trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages     (and path disclosure).

    CVE-2020-25275:
    Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application     crash via a crafted email message with certain choices for ten thousand MIME parts.

Tenable has extracted the preceding description block directly from the Tencent 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 remote NewStart CGSL host, running version MAIN 6.02, has dovecot packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can     trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages     (and path disclosure). (CVE-2020-24386)

  - Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application     crash via a crafted email message with certain choices for ten thousand MIME parts. (CVE-2020-25275)

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

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-4674-1 advisory.

    It was discovered that Dovecot incorrectly handled certain imap hibernation commands. A remote     authenticated attacker could possibly use this issue to access other users' email. This issue only     affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2020-24386)

    Innokentii Sennovskiy discovered that Dovecot incorrectly handled MIME parsing. A remote attacker could     possibly use this issue to cause Dovecot to crash, resulting in a denial of service. (CVE-2020-25275)

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:1887 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: IMAP hibernation function allows mail access (CVE-2020-24386)

    * dovecot: Denial of service via mail MIME parsing (CVE-2020-25275)

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes     linked from 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
144821	GLSA-202101-01 : Dovecot: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2021/1/11	2021/1/13	medium
294677	MiracleLinux 8 : dovecot-2.3.8-9.el8 (AXSA:2021-2023:02)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	medium
144759	SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2021:0028-1)	Nessus	SuSE Local Security Checks	2021/1/6	2024/1/30	medium
144763	SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2021:0027-1)	Nessus	SuSE Local Security Checks	2021/1/6	2024/1/30	medium
149762	CentOS 8 : dovecot (CESA-2021:1887)	Nessus	CentOS Local Security Checks	2021/5/19	2021/6/2	medium
239574	TencentOS Server 3: dovecot (TSSA-2022:0115)	Nessus	Tencent Local Security Checks	2025/6/16	2025/11/20	critical
160774	NewStart CGSL MAIN 6.02 : dovecot Multiple Vulnerabilities (NS-SA-2022-0057)	Nessus	NewStart CGSL Local Security Checks	2022/5/9	2022/5/9	medium
144710	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Dovecot vulnerabilities (USN-4674-1)	Nessus	Ubuntu Local Security Checks	2021/1/4	2025/9/3	medium
144757	SUSE SLES15 Security Update : dovecot23 (SUSE-SU-2021:0029-1)	Nessus	SuSE Local Security Checks	2021/1/6	2024/1/30	medium
149667	RHEL 8 : dovecot (RHSA-2021:1887)	Nessus	Red Hat Local Security Checks	2021/5/19	2024/11/7	medium

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