Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2020-8794 — Out-of-bounds Read in Opensmtpd

CWE-125 — Out-of-bounds Read22 documents10 sources
Severity
9.8CRITICALNVD
OSV4.7
EPSS
88.1%
top 0.51%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
4
OpensmtpdCanonical Ubuntu LinuxDebian Linux+1 more
Timeline
PublishedFeb 25
Latest updateMay 24

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages3 packages

▶NVDopensmtpd/opensmtpd< 6.6.4
▶Debianopensmtpd/opensmtpd< 6.6.4p1-1+3
▶Ubuntuopensmtpd/opensmtpd< 6.0.3p1-1ubuntu0.2+2

Also affects: Debian Linux 10.0, 9.0, Fedora 31, 32, Ubuntu Linux 18.04, 19.10

Patches

Patch: usn.ubuntu.com ↗Patch: usn.ubuntu.com ↗

🔴Vulnerability Details

5
GHSA
GHSA-hmw3-c3g9-px9f: OpenSMTPD before 6↗2022-05-24
▶
OSV
opensmtpd vulnerabilities↗2021-03-15
▶
OSV
OpenSMTPD vulnerabilities↗2020-03-02
▶
CVEList
CVE-2020-8794: OpenSMTPD before 6↗2020-02-25
▶
OSV
CVE-2020-8794: OpenSMTPD before 6↗2020-02-25
▶

💥Exploits & PoCs

3
Exploit-DB
OpenSMTPD - OOB Read Local Privilege Escalation (Metasploit)↗2020-03-09
▶
Exploit-DB
OpenSMTPD < 6.6.3p1 - Local Privilege Escalation + Remote Code Execution↗2020-02-26
▶
Metasploit
OpenSMTPD OOB Read Local Privilege Escalation↗
▶

📋Vendor Advisories

3
Ubuntu
OpenSMTPD vulnerabilities↗2021-03-15
▶
Ubuntu
OpenSMTPD vulnerabilities↗2020-03-02
▶
Debian
CVE-2020-8794: opensmtpd - OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds ...↗2020
▶

🕵️Threat Intelligence

7
Trendmicro
Operation Overtrap Targets Japanese Online Banking↗2020-03-13
▶
Trendmicro
CVE-2020-8794 Can Lead to Privilege Escalation and RCE↗2020-03-12
▶
Trendmicro
CVE-2020-8794 Can Lead to Privilege Escalation and RCE↗2020-03-12
▶
Trendmicro
CVE-2020-8794 Can Lead to Privilege Escalation and RCE↗2020-03-12
▶
Trendmicro
CVE-2020-8794 Can Lead to Privilege Escalation and RCE↗2020-03-12
▶

💬Community

3
Bugzilla
CVE-2020-8794 opensmtpd: An out-of-bounds read could lead to remote code execution [fedora-all]↗2020-03-02
▶
Bugzilla
CVE-2020-8794 opensmtpd: An out-of-bounds read could lead to remote code execution [epel-all]↗2020-03-02
▶
Bugzilla
CVE-2020-8794 opensmtpd: An out-of-bounds read could lead to remote code execution↗2020-02-25
▶