USN-2950-4: Samba regressions

Ubuntu Security Notice USN-2950-4

18th May, 2016

samba regressions

A security issue affects these releases of Ubuntu and its
derivatives:

  • Ubuntu 12.04 LTS

Summary

USN-2950-1 introduced regressions in Samba.

Software description

  • samba
    – SMB/CIFS file, print, and login server for Unix

Details

USN-2950-1 fixed vulnerabilities in Samba. The backported fixes introduced
in Ubuntu 12.04 LTS caused interoperability issues. This update fixes
compatibility with certain NAS devices, and allows connecting to Samba 3.6
servers by relaxing the “client ipc signing” parameter to “auto”.

We apologize for the inconvenience.

Original advisory details:

Jouni Knuutinen discovered that Samba contained multiple flaws in the
DCE/RPC implementation. A remote attacker could use this issue to perform
a denial of service, downgrade secure connections by performing a man in
the middle attack, or possibly execute arbitrary code. (CVE-2015-5370)

Stefan Metzmacher discovered that Samba contained multiple flaws in the
NTLMSSP authentication implementation. A remote attacker could use this
issue to downgrade connections to plain text by performing a man in the
middle attack. (CVE-2016-2110)

Alberto Solino discovered that a Samba domain controller would establish a
secure connection to a server with a spoofed computer name. A remote
attacker could use this issue to obtain sensitive information.
(CVE-2016-2111)

Stefan Metzmacher discovered that the Samba LDAP implementation did not
enforce integrity protection. A remote attacker could use this issue to
hijack LDAP connections by performing a man in the middle attack.
(CVE-2016-2112)

Stefan Metzmacher discovered that Samba did not validate TLS certificates.
A remote attacker could use this issue to spoof a Samba server.
(CVE-2016-2113)

Stefan Metzmacher discovered that Samba did not enforce SMB signing even if
configured to. A remote attacker could use this issue to perform a man in
the middle attack. (CVE-2016-2114)

Stefan Metzmacher discovered that Samba did not enable integrity protection
for IPC traffic. A remote attacker could use this issue to perform a man in
the middle attack. (CVE-2016-2115)

Stefan Metzmacher discovered that Samba incorrectly handled the MS-SAMR and
MS-LSAD protocols. A remote attacker could use this flaw with a man in the
middle attack to impersonate users and obtain sensitive information from
the Security Account Manager database. This flaw is known as Badlock.
(CVE-2016-2118)

Samba has been updated to 4.3.8 in Ubuntu 14.04 LTS and Ubuntu 15.10.
Ubuntu 12.04 LTS has been updated to 3.6.25 with backported security fixes.

In addition to security fixes, the updated packages contain bug fixes,
new features, and possibly incompatible changes. Configuration changes may
be required in certain environments.

Update instructions

The problem can be corrected by updating your system to the following
package version:

Ubuntu 12.04 LTS:
samba

2:3.6.25-0ubuntu0.12.04.4

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

LP: 1574403,

LP: 1576109

Falco 0.1.0

Sysdig falco is a behavioral activity monitoring agent that is open source and comes with native support for containers. Falco lets you define highly granular rules to check for activities involving file and network activity, process execution, IPC, and much more, using a flexible syntax. Falco will notify you when these rules are violated. You can think about falco as a mix between snort, ossec and strace.

Cisco Security Advisory 20160518-wsa4

Cisco Security Advisory – A vulnerability in Cisco AsyncOS for the Cisco Web Security Appliance (WSA) when the software handles a specific HTTP response code could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an appliance because the appliance runs out of system memory. The vulnerability occurs because the software does not free client and server connection memory and system file descriptors when a certain HTTP response code is received in the HTTP request. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. An exploit could allow the attacker to cause a DoS condition because the appliance runs out of system memory. When this happens, the device can no longer accept new incoming connection requests. Cisco has released software updates that address this vulnerability. A workaround that addresses this vulnerability is also available.

HP Security Bulletin HPSBGN03602 1

HP Security Bulletin HPSBGN03602 1 – A potential security vulnerability has been identified in HPE RESTful Interface Tool application on Linux and Windows. The vulnerability could be exploited locally resulting in disclosure of information. Revision 1 of this advisory.

HP Security Bulletin HPSBHF03578 1

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HP Security Bulletin HPSBHF03579 1

HP Security Bulletin HPSBHF03579 1 – HPE ConvergedSystem for SAP HANA has addressed security vulnerabilities in OpenSSL. The Cross-protocol Attack on TLS using SSLv2, also known as “DROWN”, could be could be remotely exploited resulting in disclosure of privileged information, unauthorized access to data, and unauthorized access to sensitive information. Revision 1 of this advisory.

Cisco Security Advisory 20160518-wsa1

Cisco Security Advisory – A vulnerability that occurs when parsing an HTTP POST request with Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) vulnerability due to the proxy process becoming unresponsive. The vulnerability is due to a lack of proper input validation of the packets that make up the HTTP POST request. An attacker could exploit this vulnerability by sending a crafted HTTP POST request to the affected device. An exploit could allow the attacker to cause a DoS condition due to the proxy process becoming unresponsive and the WSA reloading. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Cisco Security Advisory 20160518-wsa2

Cisco Security Advisory – A vulnerability in the cached file-range request functionality of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an appliance due to the appliance running out of system memory. The vulnerability is due to a failure to free memory when a file range for cached content is requested through the WSA. An attacker could exploit this vulnerability by opening multiple connections that request file ranges through the affected device. A successful exploit could allow the attacker to cause the WSA to stop passing traffic when enough memory is used and not freed. Cisco has released software updates that address this vulnerability. A workaround that mitigates this vulnerability is also available.