PowerDNS CNAME buffer overflow

powerdns-cname-bo (30257)

Low Risk

Description:

PowerDNS is vulnerable to a buffer overflow, caused by improper processing of CNAME records. By sending a malformed CNAME record, a remote attacker could overflow a buffer and cause the application to crash.

*CVSS:

Base Score:	5
Access Vector:	Remote
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Complete
Temporal Score:	3.7
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of PowerDNS (3.1.4 or later), available from the PowerDNS Web site. See References.

References:

• PowerDNS Security Advisory 2006-02: Zero second CNAME TTLs can make PowerDNS exhaust allocated stack space, and crash.
• PowerDNS Web site: Downloads.
• BID-21037: PowerDNS Remote Denial of Service and Buffer Overflow Vulnerabilities
• CVE-2006-4252: PowerDNS Recursor 3.1.3 and earlier allows remote attackers to cause a denial of service (resource exhaustion and application crash) via a CNAME record with a zero TTL, which triggers an infinite loop.
• SA22824: PowerDNS Recursor Two Vulnerabilities
• SUSE-SA:2006:070: pdns remote denial of service problem
• VUPEN/ADV-2006-4484: PowerDNS TCP DNS Queries and CNAME Records Code Execution Vulnerabilities

Platforms Affected:

• PowerDNS PowerDNS 3.1.3
• SUSE SuSE Linux 10.1

Reported:

Nov 13, 2006

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For corrections or additions please email xforce@iss.net

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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