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TITLE:
ISC DHCP DHCPv6 Dynamic DNS Lease Status Updating Denial of Service
Vulnerability

SECUNIA ADVISORY ID:
SA47555

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47555/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47555

RELEASE DATE:
2012-01-13

DISCUSS ADVISORY:
http://secunia.com/advisories/47555/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/47555/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=47555

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been reported in ISC DHCP, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a NULL pointer dereference error
within the handling of the DHCPv6 lease structure when updating
Dynamic DNS lease status, which can be exploited to cause a crash by
sending specially crafted DHCP packets.

Successful exploitation requires that DHCPv6 and Dynamic DNS are
used.

The vulnerability is reported in versions 4.2.2, 4.2.3, and 4.2.3-P1.

SOLUTION:
Update to version 4.2.3-P2.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
https://www.isc.org/software/dhcp/advisories/cve-2011-4868
https://deepthought.isc.org/article/AA-00595

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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