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TITLE:
ISC DHCP Regular Expressions Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA47153

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47153/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47153

RELEASE DATE:
2011-12-08

DISCUSS ADVISORY:
http://secunia.com/advisories/47153/#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/47153/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
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https://ca.secunia.com/?page=viewadvisory&vuln_id=47153

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 an error related to regular
expressions, which can be exploited to cause the daemon to crash by
sending specially crafted DHCP packets.

Successful exploitation requires that the server is configured to
evaluate expressions using regular expressions  (e.g. uses the "~~"
or "~=" comparison operators).

The vulnerability is reported in versions 4.x prior to versions
4.1-ESV-R4 and 4.2.3-P1.

SOLUTION:
Update to versions 4.1-ESV-R4 or 4.2.3-P1.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits BlueCat Networks.

ORIGINAL ADVISORY:
https://www.isc.org/software/dhcp/advisories/cve-2011-4539

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:
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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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