CVE-2011-2748: ISC DHCP Server Halt

ISC DHCP Server Halt

Two issues have been found in DHCP that could allow an attacker to cause the server to halt.

CVE: 

CVE-2011-2748

Document Version: 

 1.1

Posting date: 

10 Aug 2011

Program Impacted: 

DHCP

Versions affected: 

3.1.0 through 3.1-ESV-R1 (R2 never released) 4.0 all versions (EOL) 4.1.0 through 4.1.2rc1 4.1-ESV through 4.1-ESV-R3b1 4.2.0 through 4.2.2rc1 All End-of-Life versions of DHCP server are likely to be affected and ISC recommends upgrading to supported versions.

Severity: 

High

Exploitable: 

Remotely

Description: 

A pair of defects cause the server to halt upon processing certain packets. The patch is to properly discard or process those packets. 

Document ID:  CVE-2011-2748, CVE-2011-2749

CVSS Score:  7.8

CVSS Equation:  (AV:N/AC:L/Au:N/C:N/I:N/A:C)

For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: http://nvd.nist.gov/cvww.cfm?calculator&adv&version=vector=(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Workarounds: 

Limiting DHCP and Bootp packets to only within your administrative domain will limit exposure.

Active exploits: 

ISC received a report for one of the flaws and discovered the other during testing. No public exploits using these bugs are known.

Solution: 

Upgrade to: 3.1-ESV-R3, 4.1-ESV-R3 or 4.2.2 

Please note that this is the last update to 3.1-ESV as it will be End-of-Life after this release. 

Download these versions from https://www.isc.org/downloads/all

Acknowledgment:   Found by David Zych at University of Illinois

Document Revision History

1.0 27 July 2011 - Phase 1 disclosure

1.1 09 August 2011 - Phase 2 and 3 disclosures

Releated Document: 

References:  

• 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

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

This security advisory is a copy of the official document located on our website: https://www.isc.org/software/dhcp/advisories/cve-2011-2748

Do you need Software Support?  Questions on ISC's Support services or other offerings should be sent to sales@isc.org. More information on ISC's support and other offerings are available at: http://www.isc.org/community/blog/201102/BIND-support

Legal Disclaimer: 

Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time.

A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors.

© 2001-2018 Internet Systems Consortium For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted). The bind-users and the dhcp-users lists particularly have a long-standing and active membership. ISC relies on the financial support of the community to fund the development of its open source software products. If you would like to support future product evolution and maintenance as well having peace of mind knowing that our team of experts are poised to provide you with individual technical assistance whenever you call upon them, then please consider our Professional Subscription Support services - details can be found on our main website.