Improper Input Validation Affecting dovecot package, versions <1:2.2.27-3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-DEBIAN10-DOVECOT-324267
- published21 Jun 2018
- disclosed21 Jun 2018
Introduced: 21 Jun 2018
CVE-2017-2669 (opens in a new tab)How to fix?
Upgrade Debian:10 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:10 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