ESB-2018.0605.2 - UPDATE [Ubuntu] isc-dhcp-client: Multiple vulnerabilities 2018-05-29

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.0605.2
                           DHCP vulnerabilities
                                29 May 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           isc-dhcp-client
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5733 CVE-2018-5732 CVE-2017-3144
                   CVE-2016-2774  

Reference:         ASB-2017.0219
                   ESB-2018.0271
                   ESB-2016.2614
                   ESB-2016.0798
                   ESB-2016.0610

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3586-1
   http://www.ubuntu.com/usn/usn-3586-2

Comment: This bulletin contains two (2) Ubuntu security advisories.

Revision History:  May   29 2018: Updated for Ubuntu 12.04 ESM
                   March  2 2018: Initial Release

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==========================================================================
Ubuntu Security Notice USN-3586-1
March 01, 2018

isc-dhcp vulnerabilities
==========================================================================

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

- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in DHCP.

Software Description:
- - isc-dhcp: DHCP server and client

Details:

Konstantin Orekhov discovered that the DHCP server incorrectly handled a
large number of concurrent TCP sessions. A remote attacker could possibly
use this issue to cause a denial of service. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2774)

It was discovered that the DHCP server incorrectly handled socket
descriptors. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2017-3144)

Felix Wilhelm discovered that the DHCP client incorrectly handled certain
malformed responses. A remote attacker could use this issue to cause the
DHCP client to crash, resulting in a denial of service, or possibly execute
arbitrary code. In the default installation, attackers would be isolated by
the dhclient AppArmor profile. (CVE-2018-5732)

Felix Wilhelm discovered that the DHCP server incorrectly handled reference
counting. A remote attacker could possibly use this issue to cause the DHCP
server to crash, resulting in a denial of service. (CVE-2018-5733)

Update instructions:

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

Ubuntu 17.10:
  isc-dhcp-client                 4.3.5-3ubuntu2.2
  isc-dhcp-relay                  4.3.5-3ubuntu2.2
  isc-dhcp-server                 4.3.5-3ubuntu2.2
  isc-dhcp-server-ldap            4.3.5-3ubuntu2.2

Ubuntu 16.04 LTS:
  isc-dhcp-client                 4.3.3-5ubuntu12.9
  isc-dhcp-relay                  4.3.3-5ubuntu12.9
  isc-dhcp-server                 4.3.3-5ubuntu12.9
  isc-dhcp-server-ldap            4.3.3-5ubuntu12.9

Ubuntu 14.04 LTS:
  isc-dhcp-client                 4.2.4-7ubuntu12.12
  isc-dhcp-relay                  4.2.4-7ubuntu12.12
  isc-dhcp-server                 4.2.4-7ubuntu12.12
  isc-dhcp-server-ldap            4.2.4-7ubuntu12.12

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

References:
  https://usn.ubuntu.com/usn/usn-3586-1
  CVE-2016-2774, CVE-2017-3144, CVE-2018-5732, CVE-2018-5733

Package Information:
  https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu2.2
  https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.3-5ubuntu12.9
  https://launchpad.net/ubuntu/+source/isc-dhcp/4.2.4-7ubuntu12.12


===============================================================================

==========================================================================
Ubuntu Security Notice USN-3586-2
May 28, 2018

isc-dhcp vulnerabilities
==========================================================================

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

- - Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in DHCP.

Software Description:
- - isc-dhcp: DHCP server and client

Details:

USN-3586-1 fixed a vulnerability in DHCP. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

Felix Wilhelm discovered that the DHCP client incorrectly handled
certain malformed responses. A remote attacker could use this issue to
cause the DHCP client to crash, resulting in a denial of service, or
possibly execute arbitrary code. In the default installation,
attackers would be isolated by the dhclient AppArmor profile.
(CVE-2018-5732)

Felix Wilhelm discovered that the DHCP server incorrectly handled
reference counting. A remote attacker could possibly use this issue to
cause the DHCP server to crash, resulting in a denial of service.
(CVE-2018-5733)

Update instructions:

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

Ubuntu 12.04 ESM:
 isc-dhcp-client4.1.ESV-R4-0ubuntu5.13
 isc-dhcp-relay4.1.ESV-R4-0ubuntu5.13
 isc-dhcp-server4.1.ESV-R4-0ubuntu5.13
 isc-dhcp-server-ldap4.1.ESV-R4-0ubuntu5.13

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

References:
 https://usn.ubuntu.com/usn/usn-3586-2
 https://usn.ubuntu.com/usn/usn-3586-1
 CVE-2018-5732, CVE-2018-5733

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