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Ubuntu 12.04 ESM USN-3586-2 Critical: isc-dhcp Denial of Service

ubuntu
Calendar Grey May 28, 2018
Scroller Ubuntu
Ubuntu 20.04 LTS addressed OpenSSL flaws, highlighting two major security concerns that could cause data leaks.
Several security issues were fixed in DHCP.

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)

Topics%20covered

Topics Covered

security advisory denial of service critical issue remote attack ubuntu isc-dhcp

Update Instructions

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

Ubuntu 12.04 ESM:
  isc-dhcp-client                 4.1.ESV-R4-0ubuntu5.13
  isc-dhcp-relay                  4.1.ESV-R4-0ubuntu5.13
  isc-dhcp-server                 4.1.ESV-R4-0ubuntu5.13
  isc-dhcp-server-ldap            4.1.ESV-R4-0ubuntu5.13

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

References

  https://ubuntu.com/security/notices/USN-3586-2

  https://ubuntu.com/security/notices/USN-3586-1

  CVE-2018-5732, CVE-2018-5733

Severity
critical
Lowest
Low
Medium
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Critical

May 28, 2018

Topics%20covered

Topics Covered

security advisory denial of service critical issue remote attack ubuntu isc-dhcp

Package Information

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