PT-2017-15466 · Dovecot+3 · Dovecot+3

Published 2017-04-10 · Updated 2019-10-09 · CVE-2017-2669

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Dovecot versions prior to 2.2.29

Description The issue allows for a denial of service when 'dict' passdb and userdb are used for user authentication. By sending specially crafted %variable fields, an attacker can cause excessive memory usage, leading to a process crash and restart, or excessive CPU usage, causing all authentications to hang.

Recommendations For versions prior to 2.2.29, update to version 2.2.29 or later to resolve the issue. As a temporary workaround, consider restricting the use of 'dict' passdb and userdb for user authentication until a patch is available. Avoid using variable expansion in the username sent by the IMAP/POP3 client to minimize the risk of exploitation.

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

ALT-PU-2017-1530

CVE-2017-2669

DSA-3828-1

DSA-3828-2

SUSE-SU-2017:1250-1

SUSE-SU-2017_1250-1

USN-3258-1

USN-3258-2

Affected Products

Alt Linux

Dovecot

Suse

Ubuntu

References · 25

• https://osv.dev/vulnerability/DSA-3828-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3258-1 · Vendor Advisory
• https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3258-2 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2017-2669 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3258-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2017:1250-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3258-2 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-3828-2 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2017-2669 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2017-2669 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2017-2669 · Vendor Advisory
• https://debian.org/security/2017/dsa-3828 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2017-2669 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-2669 · Vendor Advisory