By Andrew Lockhart
Within the fast-moving global of pcs, issues are regularly altering. because the first version of this strong-selling ebook seemed years in the past, community safety thoughts and instruments have advanced quickly to fulfill new and extra subtle threats that pop up with alarming regularity. The second version deals either new and punctiliously up-to-date hacks for Linux, home windows, OpenBSD, and Mac OS X servers that not just allow readers to safe TCP/IP-based providers, yet is helping them enforce a great deal of shrewdpermanent host-based safety options in addition.
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Extra resources for Network Security Hacks: Tips & Tools for Protecting Your Privacy (2nd Edition)
The High security level also enables grsecurity’s PaX code, which enables nonexecutable memory pages, among other things. Enabling this causes many buffer overrun exploits to fail, since any code injected into the stack through an overrun will be unable to execute. It is still possible to exploit a program with buffer overrun vulnerabilities, although this is made much more difficult by grsecurity’s address space layout randomization features. However, some programs—such as XFree86, wine, and Java virtual machines—expect that the memory addresses returned by malloc( ) will be executable.
Hack #13 Hardening a Unix system can be a difficult process that typically involves setting up all the services that the system will run in the most secure fashion possible, as well as locking down the system to prevent local compromises. However, putting effort into securing the services that you’re running does little for the rest of the system and for unknown vulnerabilities. Luckily, even though the standard Linux kernel provides few features for proactively securing a system, there are patches available that can help the enterprising system administrator do so.
Finally, you’re ready to create users in the database. The following line creates the user jimbo, with effective user rights as www/www, and dumps him in the /usr/local/apache/htdocs directory at login: mysql -e "insert into users values ('jimbo',PASSWORD('sHHH'),'111', \ '111', '/usr/local/apache/htdocs','/bin/bash');" proftpd The password for jimbo is encrypted with MySQL’s PASSWORD( ) function before being stored. The /bin/bash line is passed to proftpd to pass proftpd’s RequireValidShell directive.