NAME¶
debsecan - Debian Security Analyzer
SYNOPSIS¶
debsecan options...
DESCRIPTION¶
debsecan analyzes the list of installed packages on the current host and
reports vulnerabilities found on the system.
OPTIONS¶
- --suite count
- Choose a specific suite. debsecan produces more informative output
(including obsolete packages) if the correct suite is specified. The
release code name has to be used ("sid"), not the temporal name
("unstable").
- --whitelist file
- Change the name of the whitelist file.
- --add-whitelist, --remove-whitelist,
--show-whitelist
- Add or remove entries from the whitelist, or print the whitelist to
standard output. See the CHANGING THE WHITELIST section
below.
- --source url
- Override the default download URL for vulnerability data.
- --status file
- Evaluate a different dpkg status file.
- --format format
- Change the output format. If format is summary (the
default), a short summary for each vulnerability is printed. The
simple format is like the summary format, except that only
the bug packages names are printed. For bugs and packages,
debsecan lists the names of vulnerabilities and binary packages,
respectively. --format detail requests a verbose output format,
showing all available data. The report format is used for email
reports.
- --line-length characters
- Specifies the line length in report mode. The default is 72.
- --mailto mailbox
- The --mailto option instructions debsecan to the send the
report to the email address mailbox. No report is sent if there
where no changes since the last invocation with --update-history.
This option requires the --format report output format. The option
value may contain macros, see the section CONFIGURATION FILE
MACROS below.
- --only-fixed
- Only list vulnerabilities for which a fix is available in the archive.
Note that it can happen that a fix is listed, although the package has not
been built for the system's architecture and is not yet available for
download. (If you use this option, you also must specify the correct suite
using --suite.)
- --no-obsolete
- Do not list any obsolete packages (see below). Using this option is not
recommended because it hides real vulnerabilities on some systems, not
just false positives.
- --history file
- Change the name of the history file used by --format report.
- --disable-https-check
- Turn off certificate validation for HTTPS.
- --update-history
- Update the vulnerability status information after reporting it using
--format report.
- --cron
- Internal option used for invocations from cron. Checks if the
vulnerability data has already been downloaded today. In this case,
further processing is skipped. See debsecan-create-cron(8) for
instructions how to create a suitable cron entry.
- --config file
- Sets the location of the configuration file.
- --help
- Display a short help message and exit.
- --version
- Display version information and exit.
CONFIGURATION FILE¶
The configuration file contains the following variables. It follows
name=
value shell syntax. If
value contains white space,
it must be surrounded by double quotes. Some variables may contain macros; see
the section
CONFIGURATION FILE MACROS below.
- MAILTO
- Sets the email address to which reports are sent in --cron mode.
May contain macros.
- REPORT
- Controls whether debsecan does any processing whatsoever in
--cron mode. (Permitted values: true and false.)
- SOURCE
- Controls the URL from which vulnerability information is fetched. If
empty, the built-in default is used.
- SUITE
- Sets the default value of the --suite option (see there).
- SUBJECT
- Changes the subject line of reports. May contain macros.
- DISABLE_HTTPS_CHECK
- Disables HTTPS certificate checking, just like the
--disable-https-check command line option.
CONFIGURATION FILE MACROS¶
Macro processing replaces strings of the form
%s(key)s with
system-dependent values. Support keys are:
- hostname
- The host name on which debsecan runs, without the domain name
part.
- fqdn
- The fully-qualified domain name of the host on which debsecan
runs.
- ip
- The IP address of the host on which debsecan runs. This may be
inaccurate on multi-homed systems.
CHANGING THE WHITELIST¶
You can use the
--add-whitelist and
--remove-whitelist options to
change the whitelist. Whitelisted vulnerabilities are not included in the
reports. For example,
- debsecan --add-whitelist CVE-2005-4601
ignores the vulnerability CVE-2005-4601 completely, while
- debsecan --add-whitelist CVE-2005-4601 perlmagick
ignores it only as far as the perlmagick is concerned. (This is the same format
that is produced by the
--format simple option.) To remove all
whitelist entries for the CVE-2005-4601 vulnerability, use:
- debsecan --remove-whitelist CVE-2005-4601
If you want to remove an entry for a specific vulnerability/package pair, list
the package name explicitly, as in:
- debsecan --remove-whitelist CVE-2005-4601 imagemagick
You can list multiple vulnerability and packages. For example,
- debsecan --add-whitelist CVE-2005-4601 \
-
- CVE-2006-0082 imagemagick perlmagick
whitelists CVE-2005-4601 for all packages, and CVE-2006-0082 for the imagemagick
and perlmagick packages only.
CAVEATS¶
Much like the official Debian security advisories,
debsecan's
vulnerability tracking is mostly based on source packages. This can be
confusing because tools like
dpkg only display binary package names.
Therefore,
debsecan displays the more familiar binary package names.
This has the unfortunate effect that all binary packages (including packages
containing only documentation, for example) are flagged as vulnerable, and not
only those packages which actually contain the vulnerable code.
If the correct
--suite option is specified,
debsecan may mark some
packages as
obsolete. This means that the binary package in question
has been removed from the archive. In this case, you need to update all the
packages depending on the obsolete package, and subsequently remove the
obsolete package.
For certain architectures, build daemons may lag considerably. In such case,
debsecan may incorrectly mark a package as fixed, even if an update is
not yet available in the Debian archive.
Note that
debsecan version uses the
--suite option only to
determine the availability of corrected packages and to detect obsolete
packages. If you specify the wrong suite, only the information on available
security updates and obsolete packages is wrong, but the list of
vulnerabilities is correct.
Mixing packages from different Debian releases is supported, as long as the
packages still carry their official version numbers. Unknown package versions
(from backported packages, for example) are compared to the version in Debian
unstable only, which may lead to incorrect reports.
EXAMPLES¶
This command prints all package names for which security fixes are available:
- debsecan --suite suite --format packages
--only-fixed
If you pass this output to
apt-get, you can download new packages which
contain security fixes. For example, if you are running sid:
- apt-get install \
-
- $(debsecan --suite sid --format packages --only-fixed)
The following command can be invoked periodically, to get notifications of new
security issues:
- debsecan --suite suite --format report \
-
- --update-history --mailto root
See
debsecan-create-cron(8) for a tool which creates a suitable cron
entry.
ENVIRONMENT¶
- http_proxy
- This environment variable instructs debsecan to use a proxy server
to fetch the vulnerability data. It must be of the form
http://proxy.example.net:8080/ (mimicking a URL).
FILES¶
- /etc/default/debsecan
- Built-in location of the configuration file.
- /var/lib/dpkg/status
- File from which the package information is fetched by default.
AUTHOR¶
debsecan was written by Florian Weimer.
SEE ALSO¶
dpkg(1),
debsecan-create-cron(8),
apt-get(8)