Infinite loop in Dovecot - CVE-2020-7046
Published: February 13, 2020
Vulnerability identifier: #VU25339
CSH Severity: High
CVSS v4: 8.7 [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]
CVE-ID: CVE-2020-7046
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop in lib-smtp in submission-login and lmtp and processing truncated UTF-8 data in command parameters. A remote non-authenticated attacker can send specially crafted command to the dovecot server and consume all available system resources and perform a denial of service attack.
Affected software
Dovecot
Arch Linux
Fedora
dovecot (Alpine package)
dovecot
Arch Linux
Fedora
dovecot (Alpine package)
dovecot
How to mitigate CVE-2020-7046
Install updates from vendor's website.
Dovecot - update to 2.3.9.3
dovecot (Alpine package) - addressed in versions 2.3.9.3-r0, 2.3.10.1-r0
dovecot - addressed in versions 2.3.9.3-1.fc30, 2.3.9.3-1.fc31
dovecot (Alpine package) - addressed in versions 2.3.9.3-r0, 2.3.10.1-r0
dovecot - addressed in versions 2.3.9.3-1.fc30, 2.3.9.3-1.fc31