Denial of service in Dovecot

Published: 2019-04-18 12:40:58 | Updated: 2019-04-18
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-10691
CVSSv3 6.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CWE ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software Dovecot
Vulnerable software versions Dovecot 2.3.5.1
Dovecot 2.3.5
Dovecot 2.3.4.1

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Vendor URL Dovecot

Security Advisory

1) Input validation error

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to improper input validation of user-supplied characters in UTF-8 encoding within the JSON encoder. A remote unauthenticated attacker can supply a specially crafted string that contains invalid UTF-8 characters via a username during authentication process or via “From” or “Subject” headers in an email (if OX push notification driver is enabled) and crash the affected server.

Successful exploitation of the vulnerability will result in denial of service (DoS) attack.


Remediation

Install updates from vendor's website.

External links

https://www.dovecot.org/list/dovecot-news/2019-April/000406.html

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