CVE-2015-3420 : The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disable

The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote attackers to cause a denial of service (login process crash) via vectors related to handshake failures.

Published 2017-09-19 15:29:01

Updated 2017-10-05 15:18:00

Source MITRE

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2015-3420

Dovecot » Dovecot
Versions up to, including, (<=) 2.2.16
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 20
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 21
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 22
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2015-3420

EPSS FAQ

2.97%

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

~ 91 %

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

CVSS scores for CVE-2015-3420

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:N/A:P	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
5.9	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	2.2	3.6	NIST
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2015-3420

CWE-295 Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2015-3420

http://www.securityfocus.com/bid/74335

Dovecot 'ssl-proxy-openssl.c' Remote Denial of Service Vulnerability
Third Party Advisory;VDB Entry
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html

[SECURITY] Fedora 20 Update: dovecot-2.2.16-2.fc20
Third Party Advisory
https://dovecot.org/pipermail/dovecot/2015-April/100618.html

[patch] TLS Handshake failures can crash imap-login
Vendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157030.html

[SECURITY] Fedora 22 Update: dovecot-2.2.16-2.fc22
Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/04/28/4

oss-security - Re: Re: CVE request: Dovecot remote DoS on TLS connections
Mailing List;Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/04/27/1

oss-security - Re: CVE request: Dovecot remote DoS on TLS connections
Mailing List;Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158236.html

[SECURITY] Fedora 21 Update: dovecot-2.2.16-2.fc21
Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1216057

1216057 – (CVE-2015-3420) CVE-2015-3420 dovecot: SSL/TLS handshake failures leading to a crash of the login process.
Issue Tracking;Third Party Advisory
https://dovecot.org/pipermail/dovecot-news/2015-May/000292.html

[Dovecot-news] v2.2.17 released
Vendor Advisory

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Vulnerability Details : CVE-2015-3420

Products affected by CVE-2015-3420

Exploit prediction scoring system (EPSS) score for CVE-2015-3420

CVSS scores for CVE-2015-3420

CWE ids for CVE-2015-3420

References for CVE-2015-3420