fwknop implements an authorization scheme that requires only a single encrypted packet to communicate various pieces of information, including desired access through a Netfilter policy and/or specific commands to execute on the target system. The main application of this program is to protect services such as SSH with an additional layer of security in order to make the exploitation of vulnerabilities much more difficult. The authorization server works by passively monitoring authorization packets via libpcap.

Debian Linux Security Advisory 3430-1 – Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause that application to use an excessive amount of CPU, leak potentially sensitive information, or crash the application.

Slackware Security Advisory – New mozilla-thunderbird packages are available for Slackware 14.1 and -current to fix security issues.

Slackware Security Advisory – New blueman packages are available for Slackware 13.37, 14.0, 14.1, and -current to fix a security issue.