CVE-2020-8794

critical-risk
Published 2020-02-25

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.

Do I need to act?

!
88.1% chance of exploitation in next 30 days
EPSS score — higher than 12% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
2 public exploits available
48185, 48140
+
Fix available
Upgrade to: 555d2121736acdd70453b24b94c8c2996d9ab5f9
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (7)

Affected Vendors

Debian Canonical Fedoraproject Opensmtpd

References (22)

Exploit http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-P...
Mailing List http://seclists.org/fulldisclosure/2020/Feb/32
Exploit http://www.openwall.com/lists/oss-security/2020/02/26/1
Mailing List http://www.openwall.com/lists/oss-security/2020/03/01/1
Mailing List http://www.openwall.com/lists/oss-security/2020/03/01/2
Exploit http://www.openwall.com/lists/oss-security/2021/05/04/7
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Patch https://usn.ubuntu.com/4294-1/
Third Party Advisory https://www.debian.org/security/2020/dsa-4634
Third Party Advisory https://www.openbsd.org/security.html
Exploit https://www.openwall.com/lists/oss-security/2020/02/24/5
Exploit http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-P...
Mailing List http://seclists.org/fulldisclosure/2020/Feb/32
Exploit http://www.openwall.com/lists/oss-security/2020/02/26/1
Mailing List http://www.openwall.com/lists/oss-security/2020/03/01/1
Mailing List http://www.openwall.com/lists/oss-security/2020/03/01/2
Exploit http://www.openwall.com/lists/oss-security/2021/05/04/7
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Patch https://usn.ubuntu.com/4294-1/
Third Party Advisory https://www.debian.org/security/2020/dsa-4634
and 2 more references
73
/ 100
critical-risk
Severity 32/34 · Critical
Exploitability 27/34 · High
Exposure 14/34 · Moderate