Exploit the possiblities

Debian Security Advisory 2826-1

Debian Security Advisory 2826-1
Posted Dec 23, 2013
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2826-1 - 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.

tags | advisory, remote, denial of service, arbitrary
systems | linux, debian
advisories | CVE-2013-6890
MD5 | 84a82f7aad72e4e571ee6a3943d23360

Debian Security Advisory 2826-1

Change Mirror Download
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- -------------------------------------------------------------------------
Debian Security Advisory DSA-2826-1 security@debian.org
http://www.debian.org/security/ Yves-Alexis Perez
December 22, 2013 http://www.debian.org/security/faq
- -------------------------------------------------------------------------

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: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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