Description
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.
References (25)
Core 25
Core References
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2855-2
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html
Third Party Advisory x_refsource_confirm
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/79732
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
Third Party Advisory x_refsource_confirm
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993
Third Party Advisory, VDB Entry vdb-entry
x_refsource_sectrack
http://www.securitytracker.com/id/1034493
Third Party Advisory vendor-advisory
x_refsource_debian
http://www.debian.org/security/2016/dsa-3433
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
Third Party Advisory x_refsource_confirm
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/201612-47
Issue Tracking, Third Party Advisory x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1290292
Vendor Advisory x_refsource_confirm
https://www.samba.org/samba/security/CVE-2015-5296.html
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2855-1
Mailing List, Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html
Various Sources x_refsource_confirm
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=1ba49b8f389eda3414b14410c7fbcb4041ca06b1
Various Sources x_refsource_confirm
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=a819d2b440aafa3138d95ff6e8b824da885a70e9
Various Sources x_refsource_confirm
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=d724f835acb9f4886c0001af32cd325dbbf1f895
Scores
CVSS v3
5.4
EPSS
0.0365
EPSS Percentile
88.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Details
CWE
CWE-20
Status
published
Products (7)
canonical/ubuntu_linux
12.04
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
15.04
canonical/ubuntu_linux
15.10
debian/debian_linux
7.0
debian/debian_linux
8.0
samba/samba
3.2.0 - 4.1.22
Published
Dec 29, 2015
Tracked Since
Feb 18, 2026