CVE-2020-8794
CRITICAL severity · CVSS 9.8 · Out-of-bounds read
9.8CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)89%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://usn.ubuntu.com/4294-1/ ↗
Additional information
- NVD record
- https://usn.ubuntu.com/4294-1/Patch
- http://seclists.org/fulldisclosure/2020/Feb/32Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/1Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/2Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
- http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlAdvisory
- http://www.openwall.com/lists/oss-security/2020/02/26/1Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7Advisory