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.
10 Aug 2011
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.
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)
Limiting DHCP and Bootp packets to only within your administrative domain will limit exposure.
ISC received a report for one of the flaws and discovered the other during testing. No public exploits using these bugs are known.
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
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