Knowledge Base ISC Main Website Ask a Question/Contact ISC
CVE-2011-0413: DHCP May Crash After Processing a DHCPv6 Decline Message
Author: Michael McNally Reference Number: AA-00456 Views: 1458 Created: 2011-09-09 23:16 Last Updated: 2012-06-08 14:07 0 Rating/ Voters

DHCP May Crash After Processing a DHCPv6 Decline Message

Processing an address previously declined and tagged as abandoned can crash the server.
CERT
VU#686084
Document version: 
1.1
Posting date: 
26 Jan 2011
Program Impacted: 
DHCP
Versions affected: 
4.0.x-4.2.x
Severity: 
Medium
Exploitable: 
remotely
Description: 

When the DHCPv6 server code processes a message for an address that was previously declined and internally tagged as abandoned it can trigger an assert failure resulting in the server crashing. This could be used to crash DHCPv6 servers remotely. This issue only affects DHCPv6 servers. DHCPv4 servers are unaffected.

CVSS Score: 6.1 (AV:A/AC:L/Au:N/C:N/I:N/A:C)

For more information on CVSS scores, visit http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2

Workarounds: 

There is no direct workaround.

Exposure to the vulnerability can be limited by a review of the filters and access to the DHCP server. It is highly recommended to limit access to those devices which require DHCP server, management access, and systems monitoring.

Active exploits: 
None known at this time.
Solution: 

Upgrade to 4.1.2-P1, 4.1-ESV-R1, or 4.2.1b1

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-2011-0413

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

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

© 2001-2014 Internet Systems Consortium

Feedback
  • Please help us to improve the content of our knowledge base by letting us know how we can improve this article or by submitting suggestions for other articles you'd like to see created. Information on how to obtain further help on our products or services can be found on our main website.' If you have a technical question or problem on which you'd like help, 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.
Info Submit Feedback on this Article
Nickname: Your Email: Subject: Comment:
Enter the code below:
Quick Jump Menu