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.

Score

CVSS 3.0 7.5 High

Status

Modified - secalert@redhat.com

Published

2018-06-21

Last modified

2024-08-05

Weaknesses

CWE-20

Affected products

• Debian Linux (Debian)
• Dovecot (Dovecot)
• Dovecot (Unknown)

References

• http://www.openwall.com/lists/oss-security/2017/04/11/1
• http://www.securityfocus.com/bid/97536
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669
• https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html
• https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch
• https://www.debian.org/security/2017/dsa-3828