CVE-2021-44141

Description

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.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
• v2.0•LOW•Score: 3.5AV:N/AC:M/Au:S/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 1.09%• Percentile: 64%

Techniques & Countermeasures

• CWE-200•Exposure of Sensitive Information to an Unauthorized Actor

  The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

• CWE-59•Improper Link Resolution Before File Access ('Link Following')

  The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Systems

• alpine•samba

  < 4.15.5-r0 | < 4.15.5-r0

• debian•samba

  all | < 2:4.16.0+dfsg-2 | < 2:4.16.0+dfsg-2 | < 2:4.16.0+dfsg-2

• ubuntu•samba

  all | all

• fedoraproject•fedora

  34 | 35

• redhat•storage

  3.0

• samba•samba

  < 4.15.5

References (6)

• https://www.samba.org/samba/security/CVE-2021-44141.html
• https://security.gentoo.org/glsa/202309-06
• https://ubuntu.com/security/CVE-2021-44141
• https://www.cve.org/CVERecord?id=CVE-2021-44141
• https://security-tracker.debian.org/tracker/CVE-2021-44141
• https://security.alpinelinux.org/vuln/CVE-2021-44141