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Critical severity · published Feb 25, 2020
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
9.8
CVSS
88.9%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)88.9% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
FE
Fedora · Fedoraproject
31; 32 · source: NVD
OP
Opensmtpd · Opensmtpd
before 6.6.4 · source: NVD
UL
Ubuntu Linux · Canonical
18.04; 19.10 · source: NVD
Affected product
UL
Ubuntu Linux
Canonical
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8794
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-8794
Exploit
http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html
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
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