CVE-2017-2669

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

Dovecot en versiones anteriores a la 2.2.29 es vulnerable a una denegación de servicio (DoS). Cuando se emplearon los "dict" passdb y userdb para la autenticación de usuarios, el nombre de usuario enviado por el cliente IMAP/POP3 se envió mediante var_expand() para realizar la expansión de %variable. El envío de campos %variable especialmente manipulados podría resultar en un uso excesivo de memoria que provoca que el proceso se cierre inesperadamente (y se reinicie) o en un uso excesivo de CPU que provoca que todas las autenticaciones dejen de responder.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-12-01 CVE Reserved
2017-04-11 CVE Published
2024-01-15 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (6)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2017/04/11/1	Mailing List
http://www.securityfocus.com/bid/97536	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669	Issue Tracking
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html	2019-10-09
https://www.debian.org/security/2017/dsa-3828	2019-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Dovecot Search vendor "Dovecot"		Dovecot Search vendor "Dovecot" for product "Dovecot"				>= 2.2.26 <= 2.2.28 Search vendor "Dovecot" for product "Dovecot" and version " >= 2.2.26 <= 2.2.28"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected