Out-of-bounds read in Dovecot - CVE-2020-12673

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Main Vulnerability Database Vulnerabilities #VU45672

Out-of-bounds read in Dovecot - CVE-2020-12673

Published: August 13, 2020


Vulnerability identifier: #VU45672
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-12673
CWE-ID: CWE-125
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 a boundary condition when processing NTLM requests. A remote attacker can send a specially formatted NTLM reques, trigger out-of-bounds read error and crash the auth service.


Affected software

Dovecot
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux for Power, little endian
CentOS
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Ubuntu
Opensuse
openEuler
Fedora
dovecot (Alpine package)
dovecot (Debian package)
dovecot-core (Ubuntu package)
dovecot (Red Hat package)
dovecot-devel
dovecot-help
dovecot-debugsource
dovecot-debuginfo
dovecot

How to mitigate CVE-2020-12673

Install updates from vendor's website.

Dovecot - update to 2.3.11.3
dovecot (Debian package) - update to 2.3.4.1-5+deb10u3
dovecot (Alpine package) - update to 0.21-1
dovecot-core (Ubuntu package) - addressed in versions 1:2.2.9-1ubuntu2.6+esm3, 1:2.2.22-1ubuntu2.13, 1:2.2.33.2-1ubuntu4.6, 1:2.3.7.2-1ubuntu3.2
dovecot (Red Hat package) - addressed in versions 2.2.36-5.el8_0.3, 2.2.36-6.el7_8.1, 2.2.36-10.el8_1.2, 2.3.8-2.el8_2.2
dovecot-devel - update to 2.3.10.1-3
dovecot-help - update to 2.3.10.1-3
dovecot-debugsource - update to 2.3.10.1-3
dovecot-debuginfo - update to 2.3.10.1-3
dovecot - update to 2.3.10.1-3
dovecot - addressed in versions 2.3.11.3-4.fc31, 2.3.11.3-5.fc32, 2.3.11.3-5.fc33

External References

Related Security Bulletins