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Gentoo GLSA-201406-23: DenyHosts Normal Severity Denial of Service

gentoo
Calendar Grey June 26, 2014
Scroller Gentoo
A distant intruder could leverage a DenyHosts flaw, potentially causing service disruption. Users are recommended to perform an upgrade.
A vulnerability in DenyHosts could allow a remote attacker to create a Denial of Service condition.

Summary

DenyHosts does not properly define the regular expressions used when parsing SSH authentication logs.

Topics%20covered

Topics Covered

security advisory denial of service gentoo remote exploit normal severity denyhosts

Resolution

All DenyHost users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-admin/denyhosts-2.6-r9"

References

[ 1 ] CVE-2013-6890 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-6890

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201406-23
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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 https://bugs.gentoo.org.

Severity: Normal
Title: DenyHosts: Denial of Service
Date: June 25, 2014
Bugs: #495130
ID: 201406-23

Topics%20covered

Topics Covered

security advisory denial of service gentoo remote exploit normal severity denyhosts

Synopsis

A vulnerability in DenyHosts could allow a remote attacker to create a Denial of Service condition.

Background

DenyHosts is a script intended to be run by Linux system administratorsto help thwart SSH server attacks.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-admin/denyhosts < 2.6-r9 >= 2.6-r9

Impact

===== A remote attacker could possibly cause a Denial of Service condition via a crafted login name.

Workaround

There is no known workaround at this time.