CVE-2020-7247
OpenBSD OpenSMTPD: Remote Code Execution
As of , CVE-2020-7247 in OpenBSD OpenSMTPD is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.
- Exploited
- Yes: CISA listed it on 25 March 2022
- US federal deadline
- 15 April 202221 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- 0.94 on 25 March 2022EPSS on the day CISA listed it.
- Public exploit
- 1 Metasploit module and 3 Exploit-DB entries (3 verified)
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
smtp_mailaddr in smtp_session.c in OpenSMTPD, as used in OpenBSD and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session.
CISA's description
smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value upon failure of input validation.
The CVE record's description, from mitre
- CVE published
- 29 January 2020
- Assigned by
- mitre
- CVSS
- 9.8 Critical (CVSS 3.1, from CISA-ADP)
- CWE-755
- Improper Handling of Exceptional Conditions
- CWE-78
- Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- Exploit-DB published an exploit (EDB-ID 47984).
- Exploit-DB published an exploit (EDB-ID 48038).
- Exploit-DB published an exploit (EDB-ID 48051).
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Public exploits
Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.
- Metasploit: OpenSMTPD MAIL FROM Remote Code Executionexploit module, rank excellent
- Exploit-DB: OpenSMTPD 6.4.0 < 6.6.1 - Local Privilege Escalation + Remote Code ExecutionEDB-ID 48051, verified by Exploit-DB, 11 February 2020
- Exploit-DB: OpenSMTPD - MAIL FROM Remote Code Execution (Metasploit)EDB-ID 48038, verified by Exploit-DB, 10 February 2020
- Exploit-DB: OpenSMTPD 6.6.1 - Remote Code ExecutionEDB-ID 47984, verified by Exploit-DB, 30 January 2020
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org