Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.071
EPSS Ranking 91.1%
CVSS Severity
CVSS v3 Score 3.7
CVSS v2 Score 5.0
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
- 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
Products affected by CVE-2017-2669
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cpe:2.3:a:dovecot:dovecot:2.2.26
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cpe:2.3:a:dovecot:dovecot:2.2.26.0
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cpe:2.3:a:dovecot:dovecot:2.2.27
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cpe:2.3:a:dovecot:dovecot:2.2.28
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cpe:2.3:o:debian:debian_linux:8.0