Home/CVE/OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for mult
CVE

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 mult

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.

CRITICAL · CVSS 9.8 EPSS 0.88136
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
▤

Affected Products & Versions

4
opensmtpd< 6.6.4
canonical ubuntu linuxall versions
fedoraproject fedoraall versions
debian linuxall versions
⚠

Public Exploits & PoCs

3
localOpenSMTPD - OOB Read Local Privilege Escalation (Metasploit)verified
remoteOpenSMTPD < 6.6.3p1 - Local Privilege Escalation + Remote Code Execution2020-02-26
pocpacketstormsecurity.com · OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlpacketstormsecurity.com
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Feb 2020 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

2
usnUSN-4875-1
usnUSN-4294-1
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
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