Improper Input Validation Affecting dovecot package, versions <1:2.2.27-3
Threat Intelligence
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Start learning- Snyk IDSNYK-DEBIAN11-DOVECOT-523108
- published21 Jun 2018
- disclosed21 Jun 2018
Introduced: 21 Jun 2018
CVE-2017-2669 (opens in a new tab)How to fix?
Upgrade Debian:11 dovecot to version 1:2.2.27-3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream dovecot package and not the dovecot package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-2669
- https://www.debian.org/security/2017/dsa-3828
- https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch
- https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html
- http://www.openwall.com/lists/oss-security/2017/04/11/1
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669
- http://www.securityfocus.com/bid/97536