Synopsis

Important: samba security update

Type/Severity

Security Advisory: Important

Topic

An update for samba is now available for Red Hat Enterprise Linux 4 Extended
Lifecycle Support.

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.

[Updated 14 April 2016]
This advisory previously incorrectly listed the CVE-2016-2112 issue as addressed
by this update. However, this issue did not affect the samba packages on Red Hat
Enterprise Linux 4 Extended Lifecycle Support. The CVE-2016-2115 was also
incorrectly listed as addressed by this update. This issue does affect the samba
packages on Red Hat Enterprise Linux 4 Extended Lifecycle Support. Customers are
advised to use the "client signing = required" configuration option in the
smb.conf file to mitigate CVE-2016-2115. No changes have been made to the
packages.

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):

• 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)
  

Red Hat would like to thank the Samba project for reporting these issues.
Upstream acknowledges Stefan Metzmacher (SerNet) as the original reporter of
CVE-2016-2118 and CVE-2016-2110.

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.

Affected Products

• Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 ia64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 4 i386

Fixes

• BZ - 1311893 - CVE-2016-2110 samba: Man-in-the-middle attacks possible with NTLMSSP authentication
• BZ - 1311902 - CVE-2016-2111 samba: Spoofing vulnerability when domain controller is configured
• BZ - 1317990 - CVE-2016-2118 samba: SAMR and LSA man in the middle attacks

CVEs

• CVE-2016-2118
• CVE-2016-2111
• CVE-2016-2110

References

• 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

Red Hat Enterprise Linux Server - Extended Life Cycle Support 4

SRPM
samba-3.0.33-3.37.el4.src.rpm	SHA-256: 4a4c6d1ffc9a2f828e7c1db20f455d74699e241a6ad9bffb456f0d4deed151ae
x86_64
samba-3.0.33-3.37.el4.x86_64.rpm	SHA-256: ad893cef9e86b611de9a048077bd3aadd296a91f8f89368b8bcba7342fb72e79
samba-3.0.33-3.37.el4.x86_64.rpm	SHA-256: ad893cef9e86b611de9a048077bd3aadd296a91f8f89368b8bcba7342fb72e79
samba-client-3.0.33-3.37.el4.x86_64.rpm	SHA-256: 42aca05174df47e01e7eb2878aefcaf0f215b8e7504ded797a39de7d72e542ab
samba-client-3.0.33-3.37.el4.x86_64.rpm	SHA-256: 42aca05174df47e01e7eb2878aefcaf0f215b8e7504ded797a39de7d72e542ab
samba-common-3.0.33-3.37.el4.i386.rpm	SHA-256: 6d4c9fbd902b25f434a915b1020461f59420ea1ba4320cf65117119650b6cdb3
samba-common-3.0.33-3.37.el4.i386.rpm	SHA-256: 6d4c9fbd902b25f434a915b1020461f59420ea1ba4320cf65117119650b6cdb3
samba-common-3.0.33-3.37.el4.x86_64.rpm	SHA-256: 1442be918750ed328c2b1ac87f5d40b236f5d74dca472fd0dd8b6db9dd8b4c70
samba-common-3.0.33-3.37.el4.x86_64.rpm	SHA-256: 1442be918750ed328c2b1ac87f5d40b236f5d74dca472fd0dd8b6db9dd8b4c70
samba-swat-3.0.33-3.37.el4.x86_64.rpm	SHA-256: c9302ff1179a1d6f1147437f142480c94b49e1099544c8ed8e8eb76baef5a5c2
samba-swat-3.0.33-3.37.el4.x86_64.rpm	SHA-256: c9302ff1179a1d6f1147437f142480c94b49e1099544c8ed8e8eb76baef5a5c2
ia64
samba-3.0.33-3.37.el4.ia64.rpm	SHA-256: 24255d02e865f8e3e1a8e12764bf1d998901d8ed29661561f05cec99cc61a181
samba-client-3.0.33-3.37.el4.ia64.rpm	SHA-256: 88acf1fab764cf53b8c4d2f2ea059796a1dc931cd137f395a0078ebc11aea9ae
samba-common-3.0.33-3.37.el4.i386.rpm	SHA-256: 6d4c9fbd902b25f434a915b1020461f59420ea1ba4320cf65117119650b6cdb3
samba-common-3.0.33-3.37.el4.ia64.rpm	SHA-256: c2cc955a26467b24499c624d835770f8b92c9ffe2de69dcfbd9df485d7665f8b
samba-swat-3.0.33-3.37.el4.ia64.rpm	SHA-256: 5ce766db9008769e3c74f38d743901d695b2e7acdeee4b029e1a86cebc6fa286
i386
samba-common-3.0.33-3.37.el4.i386.rpm	SHA-256: 6d4c9fbd902b25f434a915b1020461f59420ea1ba4320cf65117119650b6cdb3
samba-common-3.0.33-3.37.el4.i386.rpm	SHA-256: 6d4c9fbd902b25f434a915b1020461f59420ea1ba4320cf65117119650b6cdb3