[ GLSA 200707-13 ] Fail2ban: Denial of Service

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  Severity: Normal
     Title: Fail2ban: Denial of Service
      Date: July 28, 2007
      Bugs: #181214
        ID: 200707-13

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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.

Affected packages

     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/fail2ban     < 0.8.0-r1                  >= 0.8.0-r1

Description

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

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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

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  [ 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

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License

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