ESB-2019.1218 - [Debian] samba: Multiple vulnerabilities 2019-04-10

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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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