Bug 588262 – <net-fs/samba-{4.2.14,4.3.11,4.4.5}: man in the middle attack (CVE-2016-2119)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Frank Krömmelbein 2016-07-07 21:03:15 UTC]

https://www.samba.org/samba/security/CVE-2016-2119.html

Subject: Client side SMB2/3 required signing can be downgraded
CVE ID#: CVE-2016-2119
Summary: A man in the middle attack can disable client signing
         over SMB2/3, even if enforced by configuration
         parameters.

[Comment 1 GLSAMaker/CVETool Bot 2016-07-18 09:50:42 UTC]

CVE-2016-2119 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-2119):
  libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11,
  and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a
  client-signing protection mechanism, and consequently spoof SMB2 and SMB3
  servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2)
  SMB2_SESSION_FLAG_IS_NULL flag.

[Comment 2 Thomas Deutschmann (RETIRED) 2016-11-18 23:51:39 UTC]

This was addressed via https://gitweb.gentoo.org/repo/gentoo.git/commit/net-fs/samba?id=6c03f222f6a2f2551d50af0353a789fa4f6b104c


@ Maintainer(s): Please tell us how to proceed. Can we stabilize =net-fs/samba-4.3.11 and =net-fs/samba-4.5.1? 4.2.x is EOL and we shouldn't overload ARCH teams.

[Comment 3 Lars Wendler (Polynomial-C) (RETIRED) 2016-12-13 10:29:48 UTC]

We still have the heimdal issue with >=net-fs/samba-4.3

we cannot build samba's AD component without heimdal.
Last I checked we did not even have a recent enough heimdal version in the tree that samba can compile against.
Furthermore we still need heimdal and mit-krb5 being installable in parallel...

To be honest when it comes to heimdal I don't want to be involved anymore. This is a package with high frustration factor which I'm not willing to take.

[Comment 4 Thomas Deutschmann (RETIRED) 2016-12-22 02:11:10 UTC]

@ Arches,

please test and mark stable: =net-fs/samba-4.2.14

[Comment 5 Stabilization helper bot 2017-01-04 08:29:02 UTC]

An automated check of this bug failed - repoman reported dependency errors (11 lines truncated): 

> dependency.bad net-fs/samba/samba-4.2.14.ebuild: DEPEND: alpha(default/linux/alpha/13.0) ['>=sys-libs/tevent-0.9.28[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?]']
> dependency.bad net-fs/samba/samba-4.2.14.ebuild: RDEPEND: alpha(default/linux/alpha/13.0) ['>=sys-libs/tevent-0.9.28[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?]']
> dependency.bad net-fs/samba/samba-4.2.14.ebuild: DEPEND: alpha(default/linux/alpha/13.0/desktop) ['>=sys-libs/tevent-0.9.28[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?]']

[Comment 6 Tobias Klausmann (RETIRED) 2017-01-05 16:06:07 UTC]

Stable on alpha.

[Comment 7 Aaron Bauman (RETIRED) 2017-01-07 03:44:05 UTC]

amd64 stable

[Comment 8 Markus Meier 2017-01-08 18:31:55 UTC]

arm stable

[Comment 9 Jeroen Roovers (RETIRED) 2017-01-14 23:26:00 UTC]

Stable for HPPA.

[Comment 10 Michael Weber (RETIRED) 2017-02-22 21:55:26 UTC]

ppc ppc64 stable.

[Comment 11 Thomas Deutschmann (RETIRED) 2017-06-05 14:33:56 UTC]

Superseded by bug 619516.

[Comment 12 GLSAMaker/CVETool Bot 2018-05-22 22:30:36 UTC]

This issue was resolved and addressed in
 GLSA 201805-07 at https://security.gentoo.org/glsa/201805-07
by GLSA coordinator Aaron Bauman (b-man).