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 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.03374.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a n/a affected
Version Status Constraints
n/a affected
—

Configuration 1 [-]

OR cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

Configuration 3 [-]

OR cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 6
samba4-0:4.0.0-67.el6_7.rc4 cpe:/o:redhat:enterprise_linux:6 RHSA-2016:0010 2016-01-07T00:00:00Z
samba-0:3.6.23-24.el6_7 cpe:/o:redhat:enterprise_linux:6 RHSA-2016:0011 2016-01-07T00:00:00Z
Red Hat Enterprise Linux 7
samba-0:4.2.3-11.el7_2 cpe:/o:redhat:enterprise_linux:7 RHSA-2016:0006 2016-01-08T00:00:00Z
Red Hat Gluster Storage 3.1 for RHEL 6
samba-0:4.1.17-16.el6rhs cpe:/a:redhat:storage:3.1:samba:el6 RHSA-2016:0015 2016-01-08T00:00:00Z
Red Hat Gluster Storage 3.1 for RHEL 7
samba-0:4.2.4-9.1.el7rhgs cpe:/a:redhat:storage:3.1:samba:el7 RHSA-2016:0016 2016-01-08T00:00:00Z

No data.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-379-1 samba security update
Debian DSA Debian DSA DSA-3433-1 samba security update
EUVD EUVD EUVD-2015-5273 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 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.
Ubuntu USN Ubuntu USN USN-2855-1 Samba vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html cve-icon cve-icon
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html cve-icon cve-icon
http://www.debian.org/security/2016/dsa-3433 cve-icon cve-icon
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html cve-icon cve-icon
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html cve-icon cve-icon
http://www.securityfocus.com/bid/79732 cve-icon cve-icon
http://www.securitytracker.com/id/1034493 cve-icon cve-icon
http://www.ubuntu.com/usn/USN-2855-1 cve-icon cve-icon
http://www.ubuntu.com/usn/USN-2855-2 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=1290292 cve-icon cve-icon
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=1ba49b8f389eda3414b14410c7fbcb4041ca06b1 cve-icon cve-icon
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=a819d2b440aafa3138d95ff6e8b824da885a70e9 cve-icon cve-icon
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=d724f835acb9f4886c0001af32cd325dbbf1f895 cve-icon cve-icon
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2015-5296 cve-icon
https://security.gentoo.org/glsa/201612-47 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2015-5296 cve-icon
https://www.samba.org/samba/security/CVE-2015-5296.html cve-icon cve-icon cve-icon
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-06T06:41:09.517Z

Reserved: 2015-07-01T00:00:00.000Z

Link: CVE-2015-5296

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2015-12-29T22:59:02.247

Modified: 2025-04-12T10:46:40.837

Link: CVE-2015-5296

cve-icon Redhat

Severity : Moderate

Publid Date: 2015-12-16T00:00:00Z

Links: CVE-2015-5296 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses