Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dovecot | Dovecot | >= 2.2.26, <= 2.2.28 |
| Debian | Debian Linux | 8.0 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2017/04/11/1Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/97536Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669Issue TrackingThird Party Advisory
- https://dovecot.org/pipermail/dovecot-news/2017-April/000341.htmlVendor Advisory
- https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.Third Party Advisory
- https://www.debian.org/security/2017/dsa-3828Third Party Advisory
- http://www.openwall.com/lists/oss-security/2017/04/11/1Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/97536Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669Issue TrackingThird Party Advisory
- https://dovecot.org/pipermail/dovecot-news/2017-April/000341.htmlVendor Advisory
- https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.Third Party Advisory
- https://www.debian.org/security/2017/dsa-3828Third Party Advisory
FAQ
What is CVE-2017-2669?
CVE-2017-2669 is a vulnerability with a CVSS score of 3.7 (LOW). 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_expa...
How severe is CVE-2017-2669?
CVE-2017-2669 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-2669?
Check the references section above for vendor advisories and patch information. Affected products include: Dovecot Dovecot, Debian Debian Linux.