Known exploited vulnerability
CVE-2020-7247
The short answer
CVE-2020-7247 affects n/a n/a and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-25: attackers are using it, so patch it first. The vendor has linked a patch.
What it is
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.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Mar 25, 2022
Federal due date Apr 15, 2022
EPSS, next 30 days
99%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected products
n/a. NVD's record lists the exact affected versions.
References
- github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 Patch
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ Mailing ListThird Party Advisory
- seclists.org/bugtraq/2020/Jan/51 Mailing ListThird Party Advisory
- usn.ubuntu.com/4268-1/ Third Party Advisory
- www.debian.org/security/2020/dsa-4611 Mailing ListThird Party Advisory
- www.kb.cert.org/vuls/id/390745 Third Party AdvisoryUS Government Resource
- www.openbsd.org/security.html PatchVendor Advisory
- github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 Patch
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ Mailing ListThird Party Advisory
- seclists.org/bugtraq/2020/Jan/51 Mailing ListThird Party Advisory
- usn.ubuntu.com/4268-1/ Third Party Advisory
- www.debian.org/security/2020/dsa-4611 Mailing ListThird Party Advisory
Questions
Is CVE-2020-7247 being exploited?
Yes. CISA added CVE-2020-7247 to its Known Exploited Vulnerabilities catalog on 2022-03-25, with a federal remediation due date of 2022-04-15.
How do I fix CVE-2020-7247?
CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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