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TITLE:
ISC BIND Negative Caching RRSIG RRsets Denial of Service
Vulnerability

SECUNIA ADVISORY ID:
SA44719

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44719/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44719

RELEASE DATE:
2011-05-27

DISCUSS ADVISORY:
http://secunia.com/advisories/44719/#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/44719/

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=44719

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 BIND, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an assertion error within the
processing of negative responses containing large RRSIG RRsets, which
can be exploited to crash named.

Successful exploitation requires that the attacker can e.g. directly
query or trick an authorised client into querying the targeted
caching resolvers.

The vulnerability is reported in versions 9.4-ESV-R3 and later,
9.6-ESV-R2 and later, 9.6.3, 9.7.1 and later, and 9.8.0 and later.

SOLUTION:
Update to version 9.4-ESV-R4-P1 as soon as available or versions
9.6-ESV-R4-P1, 9.7.3-P1, and 9.8.0-P2.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Frank Kloeker and Michael Sinatra.

ORIGINAL ADVISORY:
https://www.isc.org/software/bind/advisories/cve-2011-1910

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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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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use those supplied by the vendor.

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