January 2005
Intermediate to advanced
544 pages
23h 44m
English
Content preview from Linux Server Security, Second Edition
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Simple Risk Analysis: ALEs
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11
For example, suppose you’ve installed the imaginary Linux distribution Bo-Wee-
vil Linux from CD-ROM. A quick way to identify and mitigate known, applicable
vulnerabilities (the first item from the previous list) is to download and install the
latest security patches from the Bo-Weevil web site. Most (real) Linux distribu-
tions can do this via automated software tools, some of which are described in
Chapter 3.
Suppose further that this host is an SMTP gateway (these are described in detail in
Chapter 9). You’ve installed the latest release of Cottonmail 8.9, your preferred
(imaginary) Mail Transport Agent (MTA), which has no known security bugs.
You’re therefore tempted to skip configuring some of its advanced security features,
such as running in a restricted subset of the filesystem (i.e., in a “chroot jail,”
explained in Chapter 6).
But you’re aware that MTA applications have historically been popular entry
points for attackers, and it’s certainly possible that a buffer overflow or similar vul-
nerability may be discovered in Cottonmail 8.9—one that the bad guys discover
before the Cottonmail team does. In other words, this falls into the second cate-
gory listed earlier: vulnerabilities that don’t currently apply but may later. So you
spend an extra ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.