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AUSCERT External Security Bulletin Redistribution
ESB-2011.0090
DHCP May Crash After Processing a DHCPv6 Decline Message
28 January 2011
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AusCERT Security Bulletin Summary
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Product: ISC DHCP 4.0.x through 4.2.x
Publisher: Internet Systems Consortium
Operating System: Linux variants
BSD variants
Solaris
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2011-0413
Original Bulletin:
http://www.isc.org/software/dhcp/advisories/cve-2011-0413
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Internet Systems Consortium Security Advisory
This ISC Security Advisory is provided as part of our Phased Disclosure
Process.
Title: DHCP May Crash After Processing a DHCPv6 Decline Message
CVE# 2011-0413
VU# 686084
CVSS: 6.2
Posting date: 2011-01-21 (Advanced notice)
Program Impacted: DHCP
Versions affected: 4.0.x-4.2.x
Severity: moderate
Exploitable: remotely
Description and Impact:
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.
Workarounds: 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.
Solution: Upgrade to 4.1.2-P1, 4.1-ESV-R1, or 4.2.1b1.
Questions regarding this advisory or ISC's Support services should be
sent to dhcp-bugs@isc.org
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
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