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.

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

10.0 HIGHAV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS

88.90% chance of exploitation in the next 30 days, 100th percentile

Published

2020-02-25

Updated

2024-08-04

Proof-of-concept exploits (2)

• http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-…
• http://www.openwall.com/lists/oss-security/2021/05/04/7

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/unix/local/opensmtpd_oob_read_lp…

ExploitDB entries (2)

• https://www.exploit-db.com/exploits/48185
• https://www.exploit-db.com/exploits/48140

Security advisories

• 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
• 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

References

• CVE Record
• NVD entry