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CVE-2017-2669

Date: June 21, 2018

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.

Language: C

Severity Score

Related Resources (9)

https://nvd.nist.gov/vuln/detail/CVE-2017-2669
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html
http://www.openwall.com/lists/oss-security/2017/04/11/1
https://www.debian.org/security/2017/dsa-3828
http://www.securityfocus.com/bid/97536
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch
https://security-tracker.debian.org/tracker/CVE-2017-2669
https://www.mend.io/vulnerability-database/CVE-2017-2669

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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