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AUSCERT External Security Bulletin Redistribution
ESB-2019.1218
samba security update
10 April 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: samba
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Administrator Compromise -- Existing Account
Create Arbitrary Files -- Existing Account
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3880 CVE-2018-1057 CVE-2018-1050
CVE-2017-9461
Reference: ESB-2019.1178
ESB-2019.1176
ESB-2017.1682
ESB-2017.1440.2
Original Bulletin:
https://www.debian.org/lts/security/2019/dla-1754
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Package : samba
Version : 2:4.2.14+dfsg-0+deb8u12
CVE ID : CVE-2017-9461 CVE-2018-1050 CVE-2018-1057 CVE-2019-3880
Various vulnerabilities were discovered in Samba, SMB/CIFS file, print,
and login server/client for Unix
CVE-2017-9461
smbd in Samba had a denial of service vulnerability (fd_open_atomic
infinite loop with high CPU usage and memory consumption) due to
wrongly handling dangling symlinks.
CVE-2018-1050
Samba was vulnerable to a denial of service attack when the RPC
spoolss service was configured to be run as an external daemon.
Missing input sanitization checks on some of the input parameters to
spoolss RPC calls could have caused the print spooler service to
crash.
CVE-2018-1057
On a Samba 4 AD DC the LDAP server of Samba incorrectly validated
permissions to modify passwords over LDAP allowing authenticated
users to change any other users' passwords, including administrative
users and privileged service accounts (eg Domain Controllers).
Thanks to the Ubuntu security team for having backported the rather
invasive changeset to Samba in Ubuntu 14.04 (which we could use to
patch Samba in Debian jessie LTS).
CVE-2019-3880
A flaw was found in the way Samba implemented an RPC endpoint
emulating the Windows registry service API. An unprivileged attacker
could have used this flaw to create a new registry hive file anywhere
they had unix permissions which could have lead to creation of a new
file in the Samba share.
For Debian 8 "Jessie", these problems have been fixed in version
2:4.2.14+dfsg-0+deb8u12.
We recommend that you upgrade your samba packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148
GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net
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