Vulnerability CVE-2017-2669
Published: 2018-06-21

Description:
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.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Dovecot -> Dovecot 
Debian -> Debian linux 

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