Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Opensmtpd | Opensmtpd | < 6.6.4 |
| Canonical | Ubuntu Linux | 18.04 |
| Fedoraproject | Fedora | 31 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-PExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2020/Feb/32Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/26/1ExploitMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/1Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7ExploitMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://usn.ubuntu.com/4294-1/PatchThird Party Advisory
- https://www.debian.org/security/2020/dsa-4634Third Party Advisory
- https://www.openbsd.org/security.htmlThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/5ExploitMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-PExploitThird Party AdvisoryVDB Entry
- http://seclists.org/fulldisclosure/2020/Feb/32Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/26/1ExploitMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/1Mailing ListThird Party Advisory
FAQ
What is CVE-2020-8794?
CVE-2020-8794 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2020-8794?
CVE-2020-8794 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2020-8794?
Check the references section above for vendor advisories and patch information. Affected products include: Opensmtpd Opensmtpd, Canonical Ubuntu Linux, Fedoraproject Fedora, Debian Debian Linux.