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pkgsrc-2021Q4 commitmail json YAML
Pullup ticket #6572 - requested by taca
net/samba4: security fix
Revisions pulled up:
- net/samba4/Makefile 1.135
- net/samba4/distinfo 1.71
---
Module Name: pkgsrc
Committed By: taca
Date: Mon Jan 10 14:11:16 UTC 2022
Modified Files:
pkgsrc/net/samba4: Makefile distinfo
Log Message:
net/samba4: update to 4.13.16
===============================
Release Notes for Samba 4.13.16
January 10, 2022
===============================
This is a security release in order to address the following defects:
o CVE-2021-43566: mkdir race condition allows share escape in Samba 4.x.
https://www.samba.org/samba/security/CVE-2021-43566.html
=======
Details
=======
o CVE-2021-43566:
All versions of Samba prior to 4.13.16 are vulnerable to a malicious
client using an SMB1 or NFS symlink race to allow a directory to be
created in an area of the server file system not exported under the
share definition. Note that SMB1 has to be enabled, or the share
also available via NFS in order for this attack to succeed.
Clients that have write access to the exported part of the file system
under a share via SMB1 unix extensions or NFS can create symlinks that
can race the server by renaming an existing path and then replacing it
with a symlink. If the client wins the race it can cause the server to
create a directory under the new symlink target after the exported
share path check has been done. This new symlink target can point to
anywhere on the server file system. The authenticated user must have
permissions to create a directory under the target directory of the
symlink.
This is a difficult race to win, but theoretically possible. Note that
the proof of concept code supplied wins the race only when the server
is slowed down and put under heavy load. Exploitation of this bug has
not been seen in the wild.
Changes since 4.13.15
---------------------
o Jeremy Allison <jra@samba.org>
* BUG 13979: CVE-2021-43566: mkdir race condition allows share escape in Samba 4.x
net/samba4: security fix
Revisions pulled up:
- net/samba4/Makefile 1.135
- net/samba4/distinfo 1.71
---
Module Name: pkgsrc
Committed By: taca
Date: Mon Jan 10 14:11:16 UTC 2022
Modified Files:
pkgsrc/net/samba4: Makefile distinfo
Log Message:
net/samba4: update to 4.13.16
===============================
Release Notes for Samba 4.13.16
January 10, 2022
===============================
This is a security release in order to address the following defects:
o CVE-2021-43566: mkdir race condition allows share escape in Samba 4.x.
https://www.samba.org/samba/security/CVE-2021-43566.html
=======
Details
=======
o CVE-2021-43566:
All versions of Samba prior to 4.13.16 are vulnerable to a malicious
client using an SMB1 or NFS symlink race to allow a directory to be
created in an area of the server file system not exported under the
share definition. Note that SMB1 has to be enabled, or the share
also available via NFS in order for this attack to succeed.
Clients that have write access to the exported part of the file system
under a share via SMB1 unix extensions or NFS can create symlinks that
can race the server by renaming an existing path and then replacing it
with a symlink. If the client wins the race it can cause the server to
create a directory under the new symlink target after the exported
share path check has been done. This new symlink target can point to
anywhere on the server file system. The authenticated user must have
permissions to create a directory under the target directory of the
symlink.
This is a difficult race to win, but theoretically possible. Note that
the proof of concept code supplied wins the race only when the server
is slowed down and put under heavy load. Exploitation of this bug has
not been seen in the wild.
Changes since 4.13.15
---------------------
o Jeremy Allison <jra@samba.org>
* BUG 13979: CVE-2021-43566: mkdir race condition allows share escape in Samba 4.x