CVE-2015-5296: Input Validation
First published: Thu Dec 10 2015(Updated: )
As per upstream samba advisory: Versions of Samba from 3.2.0 to 4.3.2 inclusive do not ensure that signing is negotiated when creating an encrypted client connection to a server. Without this a man-in-the-middle attack could downgrade the connection and connect using the supplied credentials as an unsigned, unencrypted connection. The following mitigation was suggested by upstream: When using the smbclient command, always add the argument "--signing=required" when using the "-e" or "--encrypt" argument. Alternatively, set the variable "client signing = mandatory" in the [global] section of the smb.conf file on any client using encrypted connections. To protect a Samba server exporting encrypted shares against a downgrade attack set the variable "smb encrypt = mandatory" in the smb.conf definition of the encrypted shares.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Samba Samba | >=3.2.0<4.1.22 | |
| Samba Samba | >=4.2.0<4.2.7 | |
| Samba Samba | >=4.3.0<4.3.3 | |
| Debian Debian Linux | =7.0 | |
| Debian Debian Linux | =8.0 | |
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =15.04 | |
| Canonical Ubuntu Linux | =15.10 | |
| redhat/samba | <4.1.22 | 4.1.22 |
| redhat/samba | <4.2.7 | 4.2.7 |
| redhat/samba | <4.3.3 | 4.3.3 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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/msg00047.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
- http://www.debian.org/security/2016/dsa-3433
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.securityfocus.com/bid/79732
- http://www.securitytracker.com/id/1034493
- http://www.ubuntu.com/usn/USN-2855-1
- http://www.ubuntu.com/usn/USN-2855-2
- https://bugzilla.redhat.com/show_bug.cgi?id=1290292
- https://git.samba.org/?p=samba.git;a=commit;h=1ba49b8f389eda3414b14410c7fbcb4041ca06b1
- https://git.samba.org/?p=samba.git;a=commit;h=a819d2b440aafa3138d95ff6e8b824da885a70e9
- https://git.samba.org/?p=samba.git;a=commit;h=d724f835acb9f4886c0001af32cd325dbbf1f895
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993
- https://security.gentoo.org/glsa/201612-47
- https://www.samba.org/samba/security/CVE-2015-5296.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1292069
- https://git.samba.org/?p=samba.git;a=commitdiff;h=d724f835acb9f4886c0001af32cd325dbbf1f895
- https://git.samba.org/?p=samba.git;a=commitdiff;h=1ba49b8f389eda3414b14410c7fbcb4041ca06b1
- https://git.samba.org/?p=samba.git;a=commitdiff;h=a819d2b440aafa3138d95ff6e8b824da885a70e9
- https://rhn.redhat.com/errata/RHSA-2016-0010.html
- https://rhn.redhat.com/errata/RHSA-2016-0011.html
- https://rhn.redhat.com/errata/RHSA-2016-0006.html
- https://rhn.redhat.com/errata/RHSA-2016-0016.html
- https://rhn.redhat.com/errata/RHSA-2016-0015.html
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=a819d2b440aafa3138d95ff6e8b824da885a70e9
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=1ba49b8f389eda3414b14410c7fbcb4041ca06b1
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=d724f835acb9f4886c0001af32cd325dbbf1f895
- collector/nvd-index
- agent/type
- agent/first-publish-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/author
- agent/remedy
- agent/last-modified-date
- agent/weakness
- agent/references
- agent/event
- agent/description
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2015-5296
- agent/software-canonical-lookup
- agent/tags
- agent/trending
- vendor/samba
- canonical/samba samba
- version/samba samba/3.2.0
- version/samba samba/4.2.0
- version/samba samba/4.3.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/7.0
- version/debian debian linux/8.0
- vendor/canonical
- canonical/canonical ubuntu linux
- version/canonical ubuntu linux/12.04
- version/canonical ubuntu linux/14.04
- version/canonical ubuntu linux/15.04
- version/canonical ubuntu linux/15.10
- package-manager/redhat