CVE-2015-5252

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 13.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2015-12-29 · updated 2026-06-17
Weakness: CWE-264

Description

vfs.c in smbd in Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3, when share names with certain substring relationships exist, allows remote attackers to bypass intended file-access restrictions via a symlink that points outside of a share.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04, 15.04, 15.10
Debian Linux: 7.0, 8.0
Samba: from 3.0.0 before 4.1.22; from 4.2.0 before 4.2.7; from 4.3.0 before 4.3.3 — fixed in 4.1.22, 4.2.7, 4.3.3

How to fix

Upgrade to a fixed version: Samba 4.1.22, 4.2.7, 4.3.3. Check the vendor advisory for mitigations.

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00046.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html

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