Executive Summary

Summary
Title Fail2ban: Denial of Service
Informations
Name GLSA-200707-13 First vendor Publication 2007-07-28
Vendor Gentoo Last vendor Modification 2007-07-28
Severity (Vendor) Normal Revision N/A

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:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

Fail2ban is vulnerable to a Denial of Service attack.

Background

Fail2ban is a tool for parsing log files and banning IP addresses which make too many password failures.

Description

A vulnerability has been discovered in Fail2ban when parsing log files.

Impact

A remote attacker could send specially crafted SSH login banners to the vulnerable host, which would prevent any ssh connection to the host and result in a Denial of Service.

Workaround

There is no known workaround at this time.

Resolution

All Fail2ban users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-analyzer/fail2ban-0.8.0-r1"

References

[ 1 ] Original advisory http://www.ossec.net/en/attacking-loganalysis.html#fail2ban

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200707-13.xml

Original Source

Url : http://security.gentoo.org/glsa/glsa-200707-13.xml

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:20312
 
Oval ID: oval:org.mitre.oval:def:20312
Title: DSA-1456-1 fail2ban
Description: Daniel B. Cid discovered that fail2ban, a tool to block IP addresses that cause login failures, is too liberal about parsing SSH log files, allowing an attacker to block any IP address.
Family: unix Class: patch
Reference(s): DSA-1456-1
CVE-2007-4321
 Version: 5
Platform(s): Debian GNU/Linux 4.0
 Product(s): fail2ban
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:7874
 
Oval ID: oval:org.mitre.oval:def:7874
Title: DSA-1456 fail2ban -- programming error
Description: Daniel B. Cid discovered that fail2ban, a tool to block IP addresses that cause login failures, is too liberal about parsing SSH log files, allowing an attacker to block any IP address. The old stable distribution (sarge) doesn't contain fail2ban. For the stable distribution (etch), this problem has been fixed in version 0.7.5-2etch1. For the unstable distribution (sid), this problem has been fixed in version 0.8.0-4. We recommend that you upgrade your fail2ban package.
Family: unix Class: patch
Reference(s): DSA-1456
CVE-2007-4321
 Version: 3
Platform(s): Debian GNU/Linux 4.0
 Product(s): fail2ban
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1

OpenVAS Exploits

Date Description
2008-09-24 Name : Gentoo Security Advisory GLSA 200707-13 (fail2ban)
File : nvt/glsa_200707_13.nasl
2008-01-31 Name : Debian Security Advisory DSA 1456-1 (fail2ban)
File : nvt/deb_1456_1.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
42484 Fail2ban Crafted Client Version sshd Log File Parsing Arbitrary Host Addition...

Nessus® Vulnerability Scanner

Date Description
2008-01-10 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-1456.nasl - Type : ACT_GATHER_INFO
2007-07-30 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200707-13.nasl - Type : ACT_GATHER_INFO

Alert History

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0
Date Informations
2014-02-17 11:35:01
  • Multiple Updates