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TITLE:
ISC DHCP Multiple Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA50018

VERIFY ADVISORY:
Secunia.com
https://secunia.com/advisories/50018/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=50018

RELEASE DATE:
2012-07-25

DISCUSS ADVISORY:
https://secunia.com/advisories/50018/#comments

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

https://secunia.com/advisories/50018/

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=50018

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

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

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

1) An error when handling client identifiers can be exploited to
trigger an endless loop and prevent the server from processing
further client requests via a specially crafted packet.

This vulnerability is versions 4.1-ESV through 4.1-ESV-R5, 4.1.2,
4.1.2-P1, and 4.2 (including 4.2.x-Px) through 4.2.4.

2) An error when handling client identifiers when running in DHCPv6
mode can be exploited to cause a buffer overflow and crash the server
via a specially crafted packet.

This vulnerability is reported in versions 4.2.0 through 4.2.4.

3) Two memory leak errors exist when processing messages and can be
exploited to consume all memory and prevent the server from
processing further requests by sending multiple requests to the
server.

This vulnerability is reported in versions 4.1.x and 4.2.x.

SOLUTION:
Update to version 4.1-ESV-R6 or 4.2.4-P1.

PROVIDED AND/OR DISCOVERED BY:
1, 2) Markus Hietava, Codenomicon CROSS via CERT-FI
3) Reported by the vendor

ORIGINAL ADVISORY:
ISC:
https://www.isc.org/software/dhcp/advisories/cve-2012-3571
https://www.isc.org/software/dhcp/advisories/cve-2012-3571
https://www.isc.org/software/dhcp/advisories/cve-2012-3954

CERT-FI:
https://www.cert.fi/en/reports/2012/vulnerability636698.html

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

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

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

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

EXPLOIT:
Further details available in Customer Area:
https://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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Definitions: (Criticality, Where etc.)
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Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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