Dnsmasq DHCP lease file off-by-one buffer overflow
| dnsmasq-dhcp-offbyone-bo (19825) |  Low Risk |
Description:
Dnsmasq is vulnerable to a denial of service attack caused by an off-by-one buffer overflow when reading the DHCP lease file. By sending a long hostname and client-id, a remote attacker could overflow a buffer and cause the system to crash.
Platforms Affected:
- Gentoo, Linux
- Simon Kelley, Dnsmasq prior to 2.21
Remedy:
Upgrade to the latest version of Dnsmasq (2.21 or later), available from the Dnsmasq Index Web page. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2005-04-03 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- Dnsmasq Index Web page, Index of /dnsmasq at http://www.thekelleys.org.uk/dnsmasq/.
- Dnsmasq Web page, Dnsmasq at http://www.thekelleys.org.uk/dnsmasq/doc.html.
- BID-12897: Dnsmasq Multiple Remote Vulnerabilities
- CVE-2005-0876: Off-by-one buffer overflow in Dnsmasq before 2.21 may allow attackers to execute arbitrary code via the DHCP lease file.
- SA14691: Dnsmasq DHCP Lease File Denial of Service and DNS Cache Poisoning
- SUSE-SR:2005:011: SUSE Security Summary Report
Reported:
Mar 25, 2005
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