CVE-2020-8794

OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

Published: Feb 25, 2020
Updated: Apr 14, 2023
CVE: CVE-2020-8794
Severity: Critical
Exploit:

CVSS v3:

Severity: Critical
Score: 9.8
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

Severity: High
Score: 10
AV:N/AC:L/Au:N/C:C/I:C/A:C

CWEs:

CWE-125

Affected Software
References

Software	From	Fixed in
opensmtpd / opensmtpd	-	6.6.4
canonical / ubuntu_linux	18.04	18.04.x
canonical / ubuntu_linux	19.10	19.10.x
fedoraproject / fedora	31	31.x
fedoraproject / fedora	32	32.x
debian / debian_linux	9.0	9.0.x
debian / debian_linux	10.0	10.0.x

http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html
http://seclists.org/fulldisclosure/2020/Feb/32
http://www.openwall.com/lists/oss-security/2020/02/26/1
http://www.openwall.com/lists/oss-security/2020/03/01/1
http://www.openwall.com/lists/oss-security/2020/03/01/2
http://www.openwall.com/lists/oss-security/2021/05/04/7
https://lists.fedoraproject.org/archives/list/[email protected]/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
https://usn.ubuntu.com/4294-1/
https://www.debian.org/security/2020/dsa-4634
https://www.openbsd.org/security.html
https://www.openwall.com/lists/oss-security/2020/02/24/5

Vulnerability Database

289,599

CVE-2020-8794