CVE-2021-44141

Published: 31 January 2022

All versions of Samba prior to 4.15.5 are vulnerable to a malicious client using a server symlink to determine if a file or directory exists in an area of the server file system not exported under the share definition. SMB1 with unix extensions has to be enabled in order for this attack to succeed.

Mitigation

This issue can be mitigated by disabling SMB1, which is the default
configuration in Samba 4.11 and above. In environments where SMB1 cannot
be disabled, symlink support can be disabled with unix extensions = no.

Priority

Low

CVSS 3 base score: 4.3

Status

Notes

per upstream, fixing this required a whole rewrite of the VFS
layer and there is no reasonable way to fix this in versions
older than 4.15.x. Marking this CVE as ignored for older
releases.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44141
• https://www.samba.org/samba/security/CVE-2021-44141.html
• NVD
• Launchpad
• Debian