CVE-2008-4309

El código getbulk en net-snmp 5.4 antes de v5.4.2.1, 5.3 antes de v5.3.2.3, y 5.2 antes de v5.2.5.1 permite a atacantes remotos provocar una denegación de servicio (caída) mediante vectores relacionados con el número de respuestas o repeticiones.

Wes Hardaker discovered that the SNMP service did not correctly validate HMAC authentication requests. An unauthenticated remote attacker could send specially crafted SNMPv3 traffic with a valid username and gain access to the user's views without a valid authentication passphrase. John Kortink discovered that the Net-SNMP Perl module did not correctly check the size of returned values. If a user or automated system were tricked into querying a malicious SNMP server, the application using the Perl module could be made to crash, leading to a denial of service. This did not affect Ubuntu 8.10. It was discovered that the SNMP service did not correctly handle large GETBULK requests. If an unauthenticated remote attacker sent a specially crafted request, the SNMP service could be made to crash, leading to a denial of service.