Vulnerability CVE-2013-6890
Published: 2013-12-23   Modified: 2013-12-24

Description:
denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Phil schwartz -> Denyhosts 
Fedoraproject -> Fedora 
Debian -> Debian linux 

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=1045982
http://www.debian.org/security/2013/dsa-2826
http://secunia.com/advisories/56239
http://seclists.org/oss-sec/2013/q4/535
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