#VU18307 Input validation error in Dovecot - CVE-2019-10691
Published: April 18, 2019
Vulnerability identifier: #VU18307
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-10691
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Dovecot
Dovecot
Software vendor:
Dovecot
Dovecot
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.