CVE-2017-2669
Published: 10 April 2017
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.
Notes
| Author | Note |
|---|---|
| tyhicks | Vulnerable versions: 2.2.26 - 2.2.28 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
dovecot Launchpad, Ubuntu, Debian |
precise |
Not vulnerable
|
| trusty |
Not vulnerable
(1:2.2.9-1ubuntu2.1)
|
|
| upstream |
Needed
|
|
| xenial |
Not vulnerable
|
|
| yakkety |
Not vulnerable
(1:2.2.24-1ubuntu1.3)
|
|
|
Patches: upstream: https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |