CVE-2021-20316: A flaw was found in the way Samba handled file/directory metadata

Medium severity · published Aug 23, 2022

CVE-2021-20316

A flaw was found in the way Samba handled file/directory metadata

6.8

CVSS

EPSS

On KEV

Description

A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.

CVSS vector

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

Attack vector

Network

Complexity

High

Privileges

Low

User interaction

None

Confidentiality

High

Integrity

High

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)1.0% · higher than 64% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Debian Linux · Debian

10.0; 11.0 · source: NVD

Enterprise Linux · Redhat

8.0 · source: NVD

Enterprise Linux Aus · Redhat

8.6 · source: NVD

Enterprise Linux Eus · Redhat

8.6 · source: NVD

Enterprise Linux Tus · Redhat

8.6 · source: NVD

Samba · Samba

before 4.15.0 · source: NVD

Virtualization Host · Redhat

4.0 · source: NVD

Affected product

Debian Linux

Debian

All Debian Linux CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-20316

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-20316

Third Party Advisory

https://access.redhat.com/security/cve/CVE-2021-20316

Issue Tracking

https://bugzilla.redhat.com/show_bug.cgi?id=2009673

Issue Tracking

https://bugzilla.samba.org/show_bug.cgi?id=14842

Mitigation

https://security-tracker.debian.org/tracker/CVE-2021-20316

security.gentoo.org

https://security.gentoo.org/glsa/202309-06

Vendor Advisory

https://www.samba.org/samba/security/CVE-2021-20316.html