CVE-2017-2669

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.

Category

3.7
CVSS
Severity: Low
CVSS 3.0 •
CVSS 2.0 •
EPSS 7.13% Top 10%
Vendor Advisory debian.org Vendor Advisory dovecot.org
Affected: [UNKNOWN] dovecot
Published at:
Updated at:

References

Link Tags
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html mailing list vendor advisory
http://www.openwall.com/lists/oss-security/2017/04/11/1 third party advisory mailing list
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669 issue tracking third party advisory
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch third party advisory
https://www.debian.org/security/2017/dsa-3828 third party advisory vendor advisory
http://www.securityfocus.com/bid/97536 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2017-2669?
CVE-2017-2669 has been scored as a low severity vulnerability.
How to fix CVE-2017-2669?
To fix CVE-2017-2669, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-2669 being actively exploited in the wild?
It is possible that CVE-2017-2669 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~7% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-2669?
CVE-2017-2669 affects [UNKNOWN] dovecot.
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