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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
* Extended description
* Extended solution
* Exploit code or links to exploit code
* Deep links

Read the full description:
http://corporate.secunia.com/products/48/?r=l

Contact Secunia Sales for more information:
http://corporate.secunia.com/how_to_buy/15/?r=l

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TITLE:
DenyHosts "hosts.deny" Denial of Service

SECUNIA ADVISORY ID:
SA23236

VERIFY ADVISORY:
http://secunia.com/advisories/23236/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
DenyHosts 2.x
http://secunia.com/product/12830/

DESCRIPTION:
Tavis Ormandy has discovered a vulnerability in DenyHosts, which can
be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the parsing of log
files before adding an entry in /etc/hosts.deny. This can be
exploited to add arbitrary IP addresses to /etc/hosts.deny resulting
in a DoS for that IP.

The vulnerability is confirmed in version 2.5. Other versions may
also be affected.

SOLUTION:
Use another product.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy

ORIGINAL ADVISORY:
http://bugs.gentoo.org/show_bug.cgi?id=157163

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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