Linux Security
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Linux Security

Debian: DSA-2826-1: denyhosts security update

Date 22 Dec 2013
138
Posted By LinuxSecurity Advisories
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
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Debian Security Advisory DSA-2826-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                         Yves-Alexis Perez
December 22, 2013                      https://www.debian.org/security/faq
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Package        : denyhosts
Vulnerability  : Remote denial of ssh service
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2013-6890

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.

For the oldstable distribution (squeeze), this problem has been fixed in
version 2.6-7+deb6u2.

For the stable distribution (wheezy), this problem has been fixed in
version 2.6-10+deb7u2.

For the testing distribution (jessie), this problem has been fixed in
version 2.6-10.1.

For the unstable distribution (sid), this problem has been fixed in
version 2.6-10.1.

We recommend that you upgrade your denyhosts packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.

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