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Bug 821688 (CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3738)

Summary: <net-fs/samba-{4.14.10,4.15.2}: multiple vulnerabilities
Product: Gentoo Security Reporter: John Helmert III <ajak>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: CONFIRMED ---    
Severity: minor CC: hydrapolic, samba
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: B3 [glsa?]
Package list:
Runtime testing required: ---
Bug Depends on: 827915    
Bug Blocks:    

Description John Helmert III gentoo-dev Security 2021-11-04 16:05:56 UTC

this is a heads-up that there will be Samba security updates
on Tuesday, November 9. Please make sure that your Samba servers
will be updated immediately after the release!

Impacted components:

* AD DC (CVSS 8.8, high)
* AD Domain member (CVSS 8.1, high)
* File server (CVSS 4.8 medium)"
Comment 1 John Helmert III gentoo-dev Security 2021-11-09 19:45:00 UTC
"o CVE-2016-2124:  SMB1 client connections can be downgraded to plaintext

o CVE-2020-25717: A user on the domain can become root on domain members.
                  (PLEASE READ! There are important behaviour changes described)

o CVE-2020-25718: Samba AD DC did not correctly sandbox Kerberos tickets issued
                  by an RODC.

o CVE-2020-25719: Samba AD DC did not always rely on the SID and PAC in Kerberos

o CVE-2020-25721: Kerberos acceptors need easy access to stable AD identifiers
                  (eg objectSid).

o CVE-2020-25722: Samba AD DC did not do suffienct access and conformance
                  checking of data stored.

o CVE-2021-3738:  Use after free in Samba AD DC RPC server.

o CVE-2021-23192: Subsequent DCE/RPC fragment injection vulnerability.

There's sadly a regression that "allow trusted domains = no" prevents winbindd
from starting, we'll try to provide a follow up fix as soon as possible."
Comment 2 Larry the Git Cow gentoo-dev 2021-11-10 07:43:57 UTC
The bug has been referenced in the following commit(s):

commit 88a4dc9b78154f039478d1cf25c6beef74c56588
Author:     Lars Wendler <>
AuthorDate: 2021-11-10 06:49:22 +0000
Commit:     Lars Wendler <>
CommitDate: 2021-11-10 07:43:43 +0000

    net-fs/samba: Security bump to versions 4.14.10 and 4.15.2
    Signed-off-by: Lars Wendler <>

 net-fs/samba/Manifest             |   2 +
 net-fs/samba/samba-4.14.10.ebuild | 343 ++++++++++++++++++++++++++++++++++++++
 net-fs/samba/samba-4.15.2.ebuild  | 340 +++++++++++++++++++++++++++++++++++++
 3 files changed, 685 insertions(+)
Comment 3 Matt Turner gentoo-dev 2021-11-30 18:16:21 UTC
Poly, are we ready for stabilization here?
Comment 4 Larry the Git Cow gentoo-dev 2021-12-03 15:39:20 UTC
The bug has been referenced in the following commit(s):

commit 96c00c4dd1a84dd1b7d4bb24b1c32da67d53d353
Author:     Lars Wendler <>
AuthorDate: 2021-12-03 15:38:37 +0000
Commit:     Lars Wendler <>
CommitDate: 2021-12-03 15:39:06 +0000

    net-fs/samba: Security cleanup
    Signed-off-by: Lars Wendler <>

 net-fs/samba/Manifest            |   1 -
 net-fs/samba/samba-4.14.9.ebuild | 339 ---------------------------------------
 2 files changed, 340 deletions(-)