Critical: samba

2016-04-13T11:45:00
ID ALAS-2016-686
Type amazon
Reporter Amazon
Modified 2016-04-13T11:45:00

Description

Issue Overview:

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 __)

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 validate SSL/TLS certificates in certain connections. A man-in-the-middle attacker could use this flaw to spoof a Samba server using a specially crafted SSL/TLS certificate. (CVE-2016-2113 __)

It was discovered that Samba did not enforce Server Message Block (SMB) signing for clients using the SMB1 protocol. A man-in-the-middle attacker could use this flaw to modify traffic between a client and a server. (CVE-2016-2114 __)

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 __)

Affected Packages:

samba

Issue Correction:
Run yum update samba to update your system.

New Packages:

i686:  
    ctdb-tests-4.2.10-6.33.amzn1.i686  
    libsmbclient-devel-4.2.10-6.33.amzn1.i686  
    samba-common-tools-4.2.10-6.33.amzn1.i686  
    samba-client-4.2.10-6.33.amzn1.i686  
    samba-winbind-4.2.10-6.33.amzn1.i686  
    ctdb-devel-4.2.10-6.33.amzn1.i686  
    samba-winbind-krb5-locator-4.2.10-6.33.amzn1.i686  
    libsmbclient-4.2.10-6.33.amzn1.i686  
    samba-4.2.10-6.33.amzn1.i686  
    samba-client-libs-4.2.10-6.33.amzn1.i686  
    samba-libs-4.2.10-6.33.amzn1.i686  
    samba-common-libs-4.2.10-6.33.amzn1.i686  
    samba-devel-4.2.10-6.33.amzn1.i686  
    samba-test-devel-4.2.10-6.33.amzn1.i686  
    samba-winbind-modules-4.2.10-6.33.amzn1.i686  
    samba-test-libs-4.2.10-6.33.amzn1.i686  
    samba-debuginfo-4.2.10-6.33.amzn1.i686  
    samba-python-4.2.10-6.33.amzn1.i686  
    ctdb-4.2.10-6.33.amzn1.i686  
    libwbclient-devel-4.2.10-6.33.amzn1.i686  
    samba-winbind-clients-4.2.10-6.33.amzn1.i686  
    libwbclient-4.2.10-6.33.amzn1.i686  
    samba-test-4.2.10-6.33.amzn1.i686

noarch:  
    samba-pidl-4.2.10-6.33.amzn1.noarch  
    samba-common-4.2.10-6.33.amzn1.noarch

src:  
    samba-4.2.10-6.33.amzn1.src

x86_64:  
    libwbclient-4.2.10-6.33.amzn1.x86_64  
    samba-test-devel-4.2.10-6.33.amzn1.x86_64  
    samba-client-4.2.10-6.33.amzn1.x86_64  
    samba-test-libs-4.2.10-6.33.amzn1.x86_64  
    libwbclient-devel-4.2.10-6.33.amzn1.x86_64  
    samba-4.2.10-6.33.amzn1.x86_64  
    ctdb-4.2.10-6.33.amzn1.x86_64  
    samba-winbind-krb5-locator-4.2.10-6.33.amzn1.x86_64  
    samba-common-libs-4.2.10-6.33.amzn1.x86_64  
    ctdb-devel-4.2.10-6.33.amzn1.x86_64  
    libsmbclient-devel-4.2.10-6.33.amzn1.x86_64  
    samba-python-4.2.10-6.33.amzn1.x86_64  
    samba-client-libs-4.2.10-6.33.amzn1.x86_64  
    samba-winbind-modules-4.2.10-6.33.amzn1.x86_64  
    samba-libs-4.2.10-6.33.amzn1.x86_64  
    samba-devel-4.2.10-6.33.amzn1.x86_64  
    samba-winbind-clients-4.2.10-6.33.amzn1.x86_64  
    libsmbclient-4.2.10-6.33.amzn1.x86_64  
    samba-winbind-4.2.10-6.33.amzn1.x86_64  
    samba-common-tools-4.2.10-6.33.amzn1.x86_64  
    samba-debuginfo-4.2.10-6.33.amzn1.x86_64  
    ctdb-tests-4.2.10-6.33.amzn1.x86_64  
    samba-test-4.2.10-6.33.amzn1.x86_64