[UNIX] MaraDNS Denial of Service Vulnerabilities

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MaraDNS Denial of Service Vulnerabilities
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SUMMARY

<http://www.maradns.org> MaraDNS is "a package that implements the Domain
Name Service (DNS), an essential internet service". Two denial of service
vulnerabilities have been found in MaraDNS, one is related to recursive
requests, while the other is related to the use of non-Internet class
records.

DETAILS

Vulnerable Systems:
* MaraDNS version 1.2.12.05
* MaraDNS version 1.3.04

Immune Systems:
* MaraDNS version 1.2.12.06
* MaraDNS version 1.3.05

MaraDNS are prone to local resource exhaustion vulnerabilities susceptible
of causing a denial of service. DNS requests for reverse lookups (opcode
!= 0) or non-Internet class records (qclass != 1) queries will cause the
server to leak approximately 550 bytes of memory. This can be exploited by
a remote attacker to cause MaraDNS to allocate an arbitrary large amount
of memory, thus provoking a remote denial of service when exhausting all
the available memory.


ADDITIONAL INFORMATION

The information has been provided by <mailto:jantunes@xxxxxxxxxxx> Joao
Antunes.



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