Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.868
EPSS Ranking 99.4%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 10.0
References
- 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/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
- 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/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
Products affected by CVE-2020-8794
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cpe:2.3:a:opensmtpd:opensmtpd:5.0
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cpe:2.3:a:opensmtpd:opensmtpd:5.2.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.3.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.4
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.4
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.5
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.6
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cpe:2.3:a:opensmtpd:opensmtpd:5.4.6-2
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.2
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cpe:2.3:a:opensmtpd:opensmtpd:5.7.3
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cpe:2.3:a:opensmtpd:opensmtpd:5.9.1
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cpe:2.3:a:opensmtpd:opensmtpd:5.9.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.0.3
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.1
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cpe:2.3:a:opensmtpd:opensmtpd:6.4.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.0
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.1
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.2
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cpe:2.3:a:opensmtpd:opensmtpd:6.6.3
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cpe:2.3:o:canonical:ubuntu_linux:18.04
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cpe:2.3:o:canonical:ubuntu_linux:19.10
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cpe:2.3:o:debian:debian_linux:10.0
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cpe:2.3:o:debian:debian_linux:9.0
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cpe:2.3:o:fedoraproject:fedora:31
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cpe:2.3:o:fedoraproject:fedora:32