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)
EPSS: 0.046 (90.8th percentile) — read the EPSS interpretation.
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.
Affected products
- Dovecot
- [Unknown] Dovecot — versions dovecot 2.2.29
- Debian Debian_linux — versions 8.0
Weakness classification (CWE)
References
- secalert@redhat.com (Vendor Advisory, mailing-list, x_refsource_MLIST)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- secalert@redhat.com (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
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.