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TITLE:
MyDNS DNS Update Denial of Service

SECUNIA ADVISORY ID:
SA25007

VERIFY ADVISORY:
http://secunia.com/advisories/25007/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
MyDNS 1.x
http://secunia.com/product/14066/

DESCRIPTION:
mu-b has reported a vulnerability in MyDNS, which can be exploited by
malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an input validation error within
the "update_gobble_rr" function in src/mydns/update.c. This can be
exploited to cause heap based buffer overflow and to crash the
application.

Successful exploitation requires update privileges and that
"allow-update" is set to "yes" in mydns.conf.

The vulnerability is reported in version 1.1.0. Other versions may
also be affected.

SOLUTION:
Set "allow-update" to "no".

PROVIDED AND/OR DISCOVERED BY:
mu-b

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/054024.html

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