Vulnerability Monitor

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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.

Published

2018-06-21T13:29:00.317

Last Modified

2024-11-21T03:23:56.570

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 3.7 (LOW)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-20
Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	dovecot	dovecot	≤ 2.2.28	Yes
Operating System	debian	debian_linux	8.0	Yes

References

http://www.openwall.com/lists/oss-security/2017/04/11/1 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/97536 Third Party Advisory, VDB Entry ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669 Issue Tracking, Third Party Advisory ([email protected])
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html Vendor Advisory ([email protected])
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch Third Party Advisory ([email protected])
https://www.debian.org/security/2017/dsa-3828 Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2017/04/11/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/97536 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2017/dsa-3828 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)