CVE-2020-7046 : lib-smtp in submission-login and lmtp in Dovecot 2.3.9 before 2.3.9.3 mishandles

lib-smtp in submission-login and lmtp in Dovecot 2.3.9 before 2.3.9.3 mishandles truncated UTF-8 data in command parameters, as demonstrated by the unauthenticated triggering of a submission-login infinite loop.

Published 2020-02-12 17:15:12

Updated 2021-12-30 19:51:01

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2020-7046

Dovecot » Dovecot
Versions from including (>=) 2.3.9 and before (<) 2.3.9.3
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 31
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 30
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-7046

EPSS FAQ

0.51%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 74 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-7046

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
7.5	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	MITRE
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2020-7046

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

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-7046

https://dovecot.org/pipermail/dovecot-news/2020-February/000431.html

[Dovecot-news] CVE-2020-7046: Truncated UTF-8 can be used to DoS submission-login and lmtp processes
Mailing List;Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/02/12/1

oss-security - CVE-2020-7046: Dovecot: Truncated UTF-8 can be used to DoS submission-login and lmtp processes
Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/

[SECURITY] Fedora 31 Update: dovecot-2.3.9.3-1.fc31 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://dovecot.org/security

Security
Vendor Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/

[SECURITY] Fedora 30 Update: dovecot-2.3.9.3-1.fc30 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2020-7046

Products affected by CVE-2020-7046

Exploit prediction scoring system (EPSS) score for CVE-2020-7046

CVSS scores for CVE-2020-7046

CWE ids for CVE-2020-7046

References for CVE-2020-7046