Improper input validation in Dovecot
CVE-2017-2669
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.045 (91.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.045 · newest: 0.045 · change: 0.000
Affected products
- Dovecot
- [Unknown] Dovecot — versions dovecot 2.2.29
- Debian Linux — versions 8.0
Weakness classification (CWE)
References
- dovecot.org/pipermail/dovecot-news/2017-April/000341.html (Vendor Advisory, mailing-list)
- www.openwall.com/lists/oss-security/2017/04/11/1 (mailing-list, Mailing List, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch (Third Party Advisory)
- www.debian.org/security/2017/dsa-3828 (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/97536 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2017-2669?
- CVE-2017-2669 is a low-severity vulnerability in Dovecot, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2018-06-21.
- How severe is CVE-2017-2669?
- Low severity. CVSS v3 base score is 3.7 out of 10.