news 28 Posted April 12, 2016 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: samba security update Advisory ID: RHSA-2016:0623-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0623.html Issue date: 2016-04-12 CVE Names: CVE-2015-5370 CVE-2016-2110 CVE-2016-2111 CVE-2016-2112 CVE-2016-2115 CVE-2016-2118 ===================================================================== 1. Summary: An update for samba is now available for Red Hat Enterprise Linux 5.6 Long Life and Red Hat Enterprise Linux 5.9 Long Life. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Long Life (v. 5.6 server) - i386, ia64, x86_64 Red Hat Enterprise Linux Long Life (v. 5.9 server) - i386, ia64, ppc, s390x, x86_64 3. Description: Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information. Security Fix(es): * Multiple flaws were found in Samba's DCE/RPC protocol implementation. A remote, authenticated attacker could use these flaws to cause a denial of service against the Samba server (high CPU load or a crash) or, possibly, execute arbitrary code with the permissions of the user running Samba (root). This flaw could also be used to downgrade a secure DCE/RPC connection by a man-in-the-middle attacker taking control of an Active Directory (AD) object and compromising the security of a Samba Active Directory Domain Controller (DC). (CVE-2015-5370) Note: While Samba packages as shipped in Red Hat Enterprise Linux do not support running Samba as an AD DC, this flaw applies to all roles Samba implements. * A protocol flaw, publicly referred to as Badlock, was found in the Security Account Manager Remote Protocol (MS-SAMR) and the Local Security Authority (Domain Policy) Remote Protocol (MS-LSAD). Any authenticated DCE/RPC connection that a client initiates against a server could be used by a man-in-the-middle attacker to impersonate the authenticated user against the SAMR or LSA service on the server. As a result, the attacker would be able to get read/write access to the Security Account Manager database, and use this to reveal all passwords or any other potentially sensitive information in that database. (CVE-2016-2118) * Several flaws were found in Samba's implementation of NTLMSSP authentication. An unauthenticated, man-in-the-middle attacker could use this flaw to clear the encryption and integrity flags of a connection, causing data to be transmitted in plain text. The attacker could also force the client or server into sending data in plain text even if encryption was explicitly requested for that connection. (CVE-2016-2110) * It was discovered that Samba configured as a Domain Controller would establish a secure communication channel with a machine using a spoofed computer name. A remote attacker able to observe network traffic could use this flaw to obtain session-related information about the spoofed machine. (CVE-2016-2111) * It was found that Samba's LDAP implementation did not enforce integrity protection for LDAP connections. A man-in-the-middle attacker could use this flaw to downgrade LDAP connections to use no integrity protection, allowing them to hijack such connections. (CVE-2016-2112) * It was found that Samba did not enable integrity protection for IPC traffic by default. A man-in-the-middle attacker could use this flaw to view and modify the data sent between a Samba server and a client. (CVE-2016-2115) Red Hat would like to thank the Samba project for reporting these issues. Upstream acknowledges Jouni Knuutinen (Synopsis) as the original reporter of CVE-2015-5370; and Stefan Metzmacher (SerNet) as the original reporter of CVE-2016-2118, CVE-2016-2110, CVE-2016-2112, and CVE-2016-2115. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the smb service will be restarted automatically. 5. Bugs fixed (https://bugzilla.redhat.com/): 1309987 - CVE-2015-5370 samba: crash in dcesrv_auth_bind_ack due to missing error check 1311893 - CVE-2016-2110 samba: Man-in-the-middle attacks possible with NTLMSSP authentication 1311902 - CVE-2016-2111 samba: Spoofing vulnerability when domain controller is configured 1311903 - CVE-2016-2112 samba: Missing downgrade detection 1312084 - CVE-2016-2115 samba: Smb signing not required by default when smb client connection is used for ipc usage 1317990 - CVE-2016-2118 samba: SAMR and LSA man in the middle attacks 6. Package List: Red Hat Enterprise Linux Long Life (v. 5.6 server): Source: samba-3.0.33-3.30.el5_6.src.rpm i386: libsmbclient-3.0.33-3.30.el5_6.i386.rpm libsmbclient-devel-3.0.33-3.30.el5_6.i386.rpm samba-3.0.33-3.30.el5_6.i386.rpm samba-client-3.0.33-3.30.el5_6.i386.rpm samba-common-3.0.33-3.30.el5_6.i386.rpm samba-debuginfo-3.0.33-3.30.el5_6.i386.rpm samba-swat-3.0.33-3.30.el5_6.i386.rpm ia64: libsmbclient-3.0.33-3.30.el5_6.ia64.rpm libsmbclient-devel-3.0.33-3.30.el5_6.ia64.rpm samba-3.0.33-3.30.el5_6.ia64.rpm samba-client-3.0.33-3.30.el5_6.ia64.rpm samba-common-3.0.33-3.30.el5_6.ia64.rpm samba-debuginfo-3.0.33-3.30.el5_6.ia64.rpm samba-swat-3.0.33-3.30.el5_6.ia64.rpm x86_64: libsmbclient-3.0.33-3.30.el5_6.i386.rpm libsmbclient-3.0.33-3.30.el5_6.x86_64.rpm libsmbclient-devel-3.0.33-3.30.el5_6.i386.rpm libsmbclient-devel-3.0.33-3.30.el5_6.x86_64.rpm samba-3.0.33-3.30.el5_6.x86_64.rpm samba-client-3.0.33-3.30.el5_6.x86_64.rpm samba-common-3.0.33-3.30.el5_6.i386.rpm samba-common-3.0.33-3.30.el5_6.x86_64.rpm samba-debuginfo-3.0.33-3.30.el5_6.i386.rpm samba-debuginfo-3.0.33-3.30.el5_6.x86_64.rpm samba-swat-3.0.33-3.30.el5_6.x86_64.rpm Red Hat Enterprise Linux Long Life (v. 5.9 server): Source: samba-3.0.33-3.40.el5_9.src.rpm i386: libsmbclient-3.0.33-3.40.el5_9.i386.rpm libsmbclient-devel-3.0.33-3.40.el5_9.i386.rpm samba-3.0.33-3.40.el5_9.i386.rpm samba-client-3.0.33-3.40.el5_9.i386.rpm samba-common-3.0.33-3.40.el5_9.i386.rpm samba-debuginfo-3.0.33-3.40.el5_9.i386.rpm samba-swat-3.0.33-3.40.el5_9.i386.rpm ia64: libsmbclient-3.0.33-3.40.el5_9.ia64.rpm libsmbclient-devel-3.0.33-3.40.el5_9.ia64.rpm samba-3.0.33-3.40.el5_9.ia64.rpm samba-client-3.0.33-3.40.el5_9.ia64.rpm samba-common-3.0.33-3.40.el5_9.ia64.rpm samba-debuginfo-3.0.33-3.40.el5_9.ia64.rpm samba-swat-3.0.33-3.40.el5_9.ia64.rpm ppc: libsmbclient-3.0.33-3.40.el5_9.ppc.rpm libsmbclient-3.0.33-3.40.el5_9.ppc64.rpm libsmbclient-devel-3.0.33-3.40.el5_9.ppc.rpm libsmbclient-devel-3.0.33-3.40.el5_9.ppc64.rpm samba-3.0.33-3.40.el5_9.ppc.rpm samba-client-3.0.33-3.40.el5_9.ppc.rpm samba-common-3.0.33-3.40.el5_9.ppc.rpm samba-common-3.0.33-3.40.el5_9.ppc64.rpm samba-debuginfo-3.0.33-3.40.el5_9.ppc.rpm samba-debuginfo-3.0.33-3.40.el5_9.ppc64.rpm samba-swat-3.0.33-3.40.el5_9.ppc.rpm s390x: libsmbclient-3.0.33-3.40.el5_9.s390.rpm libsmbclient-3.0.33-3.40.el5_9.s390x.rpm libsmbclient-devel-3.0.33-3.40.el5_9.s390.rpm libsmbclient-devel-3.0.33-3.40.el5_9.s390x.rpm samba-3.0.33-3.40.el5_9.s390x.rpm samba-client-3.0.33-3.40.el5_9.s390x.rpm samba-common-3.0.33-3.40.el5_9.s390.rpm samba-common-3.0.33-3.40.el5_9.s390x.rpm samba-debuginfo-3.0.33-3.40.el5_9.s390.rpm samba-debuginfo-3.0.33-3.40.el5_9.s390x.rpm samba-swat-3.0.33-3.40.el5_9.s390x.rpm x86_64: libsmbclient-3.0.33-3.40.el5_9.i386.rpm libsmbclient-3.0.33-3.40.el5_9.x86_64.rpm libsmbclient-devel-3.0.33-3.40.el5_9.i386.rpm libsmbclient-devel-3.0.33-3.40.el5_9.x86_64.rpm samba-3.0.33-3.40.el5_9.x86_64.rpm samba-client-3.0.33-3.40.el5_9.x86_64.rpm samba-common-3.0.33-3.40.el5_9.i386.rpm samba-common-3.0.33-3.40.el5_9.x86_64.rpm samba-debuginfo-3.0.33-3.40.el5_9.i386.rpm samba-debuginfo-3.0.33-3.40.el5_9.x86_64.rpm samba-swat-3.0.33-3.40.el5_9.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2015-5370 https://access.redhat.com/security/cve/CVE-2016-2110 https://access.redhat.com/security/cve/CVE-2016-2111 https://access.redhat.com/security/cve/CVE-2016-2112 https://access.redhat.com/security/cve/CVE-2016-2115 https://access.redhat.com/security/cve/CVE-2016-2118 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/badlock https://access.redhat.com/articles/2253041 http://badlock.org/ https://access.redhat.com/articles/2243351 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFXDV3kXlSAg2UNWIIRAvq4AJ4zNBRqyDWkZ89tunD2xV4qyKFc7QCeOfv4 hNq0ySm45U6MYz0Z3JKZRIM= =d6LY -----END PGP SIGNATURE----- -- Share this post Link to post
