Fedora 31 update for dovecot



| Updated: 2025-04-25
Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2020-12100
CVE-2020-12673
CVE-2020-10967
CVE-2020-12674
CWE-ID CWE-835
CWE-125
CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #3 is available.
Vulnerable software
 Fedora
Operating systems & Components / Operating system

dovecot
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Infinite loop

EUVDB-ID: #VU45671

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12100

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in submission, lmtp, and lda when processing e-mail message with deeply nested MIME parts. A remote attacker can send a specially crafted email to consume all available system resources and cause denial of service conditions.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 31

dovecot: before 2.3.11.3-4.fc31

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2020-cd8b8f887b


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds read

EUVDB-ID: #VU45672

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12673

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when processing NTLM requests. A remote attacker can send a specially formatted NTLM reques, trigger out-of-bounds read error and crash the auth service.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 31

dovecot: before 2.3.11.3-4.fc31

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2020-cd8b8f887b


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Input validation error

EUVDB-ID: #VU27984

Risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-10967

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input passed via email message. A remote attacker can send a specially crafted email with empty quoted localpart and crash the submission or lmtp service.

PoC:

Send mail with envelope sender or recipient as ``<""@example.org>``.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 31

dovecot: before 2.3.11.3-4.fc31

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2020-cd8b8f887b


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

4) Input validation error

EUVDB-ID: #VU45673

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12674

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in RPA requests. A remote attacker can send a specially formatted 0-lenght RPA request and crash the auth service.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 31

dovecot: before 2.3.11.3-4.fc31

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2020-cd8b8f887b


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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