Debian: DSA-3433-1: samba security update

    Date02 Jan 2016
    CategoryDebian
    61
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix. The Common Vulnerabilities and Exposures project identifies the following issues:
    
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    Debian Security Advisory DSA-3433-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    January 02, 2016                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : samba
    CVE ID         : CVE-2015-3223 CVE-2015-5252 CVE-2015-5296 CVE-2015-5299 
                     CVE-2015-5330 CVE-2015-7540 CVE-2015-8467
    
    Several vulnerabilities have been discovered in Samba, a SMB/CIFS file,
    print, and login server for Unix. The Common Vulnerabilities and
    Exposures project identifies the following issues:
    
    CVE-2015-3223
    
        Thilo Uttendorfer of Linux Information Systems AG discovered that a
        malicious request can cause the Samba LDAP server to hang, spinning
        using CPU. A remote attacker can take advantage of this flaw to
        mount a denial of service.
    
    CVE-2015-5252
    
        Jan "Yenya" Kasprzak and the Computer Systems Unit team at Faculty
        of Informatics, Masaryk University discovered that insufficient
        symlink verification could allow data access outside an exported
        share path.
    
    CVE-2015-5296
    
        Stefan Metzmacher of SerNet discovered that Samba does not ensure
        that signing is negotiated when creating an encrypted client
        connection to a server. This allows a man-in-the-middle attacker to
        downgrade the connection and connect using the supplied credentials
        as an unsigned, unencrypted connection.
    
    CVE-2015-5299
    
        It was discovered that a missing access control check in the VFS
        shadow_copy2 module could allow unauthorized users to access
        snapshots.
    
    CVE-2015-5330
    
        Douglas Bagnall of Catalyst discovered that the Samba LDAP server
        is vulnerable to a remote memory read attack. A remote attacker can
        obtain sensitive information from daemon heap memory by sending
        crafted packets and then either read an error message, or a
        database value.
    
    CVE-2015-7540
    
        It was discovered that a malicious client can send packets that
        cause the LDAP server provided by the AD DC in the samba daemon
        process to consume unlimited memory and be terminated.
    
    CVE-2015-8467
    
        Andrew Bartlett of the Samba Team and Catalyst discovered that a
        Samba server deployed as an AD DC can expose Windows DCs in the same
        domain to a denial of service via the creation of multiple machine
        accounts. This issue is related to the MS15-096 / CVE-2015-2535
        security issue in Windows.
    
    For the oldstable distribution (wheezy), these problems have been fixed
    in version 2:3.6.6-6+deb7u6. The oldstable distribution (wheezy) is only
    affected by CVE-2015-5252, CVE-2015-5296 and CVE-2015-5299.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 2:4.1.17+dfsg-2+deb8u1. The fixes for CVE-2015-3223 and
    CVE-2015-5330 required an update to ldb 2:1.1.17-2+deb8u1 to correct the
    defects.
    
    For the unstable distribution (sid), these problems have been fixed in
    version 2:4.1.22+dfsg-1. The fixes for CVE-2015-3223 and CVE-2015-5330
    required an update to ldb 2:1.1.24-1 to correct the defects.
    
    We recommend that you upgrade your samba packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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