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CVE-2010-2156: DHCP: Fencepost error on zero-length client identifier
Author: Cathy Almond Reference Number: AA-00964 Views: 3626 Created: 2013-05-29 14:36 Last Updated: 2013-05-30 12:13 0 Rating/ Voters

A request from a client containing a zero length client id will cause the server to exit.

Posting date: 
01 Jun 2010
Program Impacted: 
DHCP
Versions affected: 
4.0.x, 4.1.x, 4.2.x
Severity: 
High
Exploitable: 
Remotely

Description:

A request from a client containing a zero length client id will cause the server to exit.

Impact:

The DHCP server will exit upon receipt of a request containing a zero length client ID, necessitating a restart.

Workarounds:

Some defense against this may be achieved by restricting packets to servers, but only an upgrade provides a complete solution.

Active exploits:

None known at this time.

Solution: 

Upgrade DHCP to one of the following: 4.1.1-P1 or 4.0.2-P1.

There are no plans for fixes for affected versions of DHCP previous to 4.1.1 and 4.0.2 of the 4.x branches, and please note that version 3.1.x is not affected.

The patch will be included in the next beta release for 4.2.0.

Related Documents:

If you'd like more information on our Forum or product support please visit www.isc.org/support.

Do you still have questions?  Questions regarding this advisory should go to security-officer@isc.org

Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.

ISC Security Vulnerability Disclosure Policy:  Details of our current security advisory policy and practice can be found here: https://www.isc.org/security-vulnerability-disclosure-policy

This Knowledge Base article https://kb.isc.org/article/AA-00964 is the complete and official security advisory document.

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