Out-of-bounds write in OpenDMARC - CVE-2020-12460
Published: July 28, 2020 / Updated: April 30, 2021
Vulnerability identifier: #VU34050
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-12460
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has improper null termination in the function opendmarc_xml_parse that can result in a one-byte heap overflow in opendmarc_xml when parsing a specially crafted DMARC aggregate report. This can cause remote memory corruption when a '�' byte overwrites the heap metadata of the next chunk and its PREV_INUSE flag.
Affected software
OpenDMARC
Arch Linux
Gentoo Linux
Fedora
Ubuntu
libopendmarc2 (Ubuntu package)
opendmarc (Ubuntu package)
opendmarc
Arch Linux
Gentoo Linux
Fedora
Ubuntu
libopendmarc2 (Ubuntu package)
opendmarc (Ubuntu package)
opendmarc
How to mitigate CVE-2020-12460
Install update from vendor's website.
OpenDMARC - update to 1.4.0
libopendmarc2 (Ubuntu package) - addressed in versions Ubuntu Pro, 1.3.2-3ubuntu0.2, 1.3.2-7ubuntu0.1
opendmarc (Ubuntu package) - addressed in versions Ubuntu Pro, 1.3.2-3ubuntu0.2, 1.3.2-7ubuntu0.1
opendmarc - addressed in versions 1.4.0-1.fc34, 1.4.1-1.el7, 1.4.1-1.el8, 1.4.1-1.fc33, 1.4.1-1.fc34
libopendmarc2 (Ubuntu package) - addressed in versions Ubuntu Pro, 1.3.2-3ubuntu0.2, 1.3.2-7ubuntu0.1
opendmarc (Ubuntu package) - addressed in versions Ubuntu Pro, 1.3.2-3ubuntu0.2, 1.3.2-7ubuntu0.1
opendmarc - addressed in versions 1.4.0-1.fc34, 1.4.1-1.el7, 1.4.1-1.el8, 1.4.1-1.fc33, 1.4.1-1.fc34