Dnsmasq DHCP lease denial of service

dnsmasq-dhcplease-dos (43957)

Low Risk

Description:

Dnsmasq is vulnerable to a denial of service, caused by an unspecified error during the attempted renewal of a DHCP lease by an unknown client. A remote attacker could exploit this vulnerability to cause the service to crash.

*CVSS:

Base Score:	5
Access Vector:	Network
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Partial
Temporal Score:	3.7
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of Dnsmasq (2.45 or later), available from the Dnsmasq Web page. See References.

References:

• Dnsmasq Web page: Dnsmasq.
• gmane Mailing List, 2008-07-20 14:20:09 GMT: dnsmasq 2.44 available.
• CVE-2008-3350: dnsmasq 2.43 allows remote attackers to cause a denial of service (daemon crash) by (1) sending a DHCPINFORM while lacking a DHCP lease, or (2) attempting to renew a nonexistent DHCP lease for an invalid subnet as an unknown client
• GLSA-200809-02: dnsmasq: Denial of Service and DNS spoofing
• SA31197: dnsmasq Denial of Service and DNS Cache Poisoning
• VUPEN/ADV-2008-2166: Dnsmasq Transaction ID Remote Cache Poisoning Vulnerability

Platforms Affected:

• Gentoo Linux
• Thekelleys Dnsmasq 2.43

Reported:

Jul 20, 2008

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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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