Executive Summary

Summary
Title denyhosts regression update
Informations
Name DSA-2826 First vendor Publication 2013-12-22
Vendor Debian Last vendor Modification 2014-01-23
Severity (Vendor) N/A Revision 2

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A regression has been found on the denyhosts packages fixing CVE-2013-6890. This regression could cause an attempted breakin attempt to be missed by denyhosts, which would then fail to enforce a ban.

For the oldstable distribution (squeeze), this problem has been fixed in version 2.6-7+deb6u3.

For the stable distribution (wheezy), this problem has been fixed in version 2.6-10+deb7u3.

For the testing (jessie) and unstable (sid) distribution, the package denyhosts has been removed, and its users are encouraged to switch to an alternative like fail2ban.

We recommend that you upgrade your denyhosts packages.

Original Source

Url : http://www.debian.org/security/2014/dsa-2826

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-287 Improper Authentication

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:21063
 
Oval ID: oval:org.mitre.oval:def:21063
Title: DSA-2826-1 deny hosts - Remote denial of ssh service
Description: Helmut Grohne discovered that deny hosts, a tool preventing SSH brute-force attacks, could be used to perform remote denial of service against the SSH daemon. Incorrectly specified regular expressions used to detect brute force attacks in authentication logs could be exploited by a malicious user to forge crafted login names in order to make deny hosts ban arbitrary IP addresses.
Family: unix Class: patch
Reference(s): DSA-2826-1
CVE-2013-6890
 Version: 5
Platform(s): Debian GNU/Linux 6.0
Debian GNU/Linux 7
Debian GNU/kFreeBSD 6.0
Debian GNU/kFreeBSD 7
 Product(s): denyhosts
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:28977
 
Oval ID: oval:org.mitre.oval:def:28977
Title: DSA-2826-2 -- denyhosts -- remote denial of ssh service
Description: Helmut Grohne discovered that denyhosts, a tool preventing SSH brute-force attacks, could be used to perform remote denial of service against the SSH daemon. Incorrectly specified regular expressions used to detect brute force attacks in authentication logs could be exploited by a malicious user to forge crafted login names in order to make denyhosts ban arbitrary IP addresses.
Family: unix Class: patch
Reference(s): DSA-2826-2
CVE-2013-6890
 Version: 3
Platform(s): Debian GNU/Linux 6.0
Debian GNU/kFreeBSD 6.0
Debian GNU/Linux 7.0
Debian GNU/kFreeBSD 7.0
 Product(s): denyhosts
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 3
Os 1

Nessus® Vulnerability Scanner

Date Description
2015-01-06 Name : The remote Fedora host is missing a security update.
File : fedora_2014-17067.nasl - Type : ACT_GATHER_INFO
2015-01-06 Name : The remote Fedora host is missing a security update.
File : fedora_2014-17081.nasl - Type : ACT_GATHER_INFO
2014-06-26 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201406-23.nasl - Type : ACT_GATHER_INFO
2013-12-23 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-2826.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 11:32:26
  • Multiple Updates
2014-01-24 00:18:16
  • Multiple Updates
2013-12-24 21:23:34
  • Multiple Updates
2013-12-24 13:22:15
  • Multiple Updates
2013-12-22 21:19:08
  • First insertion