3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
101 lines
4 KiB
Text
101 lines
4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:60 Security Advisory
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FreeBSD, Inc.
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Topic: boa web server allows arbitrary file access/execution
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Category: ports
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Module: boa
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Announced: 2000-10-30
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Credits: Lluis Mora <llmora@S21SEC.COM>
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Affects: Ports collection prior to the correction date.
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Corrected: 2000-10-07
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Vendor status: Updated version released
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FreeBSD only: NO
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I. Background
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Boa is a high-performance web server.
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II. Problem Description
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The boa port, versions after 0.92 but prior to 0.94.8.3, contains a
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vulnerability which allows remote users to view arbitrary files
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outside the document root. The vulnerability is that boa does not
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correctly restrict URL-encoded requests containing ".." in the path.
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In addition, if the administrator has enabled CGI extension support, a
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request for any file ending in .cgi will result in the file being
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executed with the privileges of the user id running the web server.
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Since the .cgi file may reside outside the document root, this may
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result in untrusted binaries/scripts being executed. If an attacker
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can upload files to the system, e.g. via anonymous FTP, they can cause
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arbitrary code to be executed by the user running the web server.
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The boa port is not installed by default, nor is it "part of FreeBSD"
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as such: it is part of the FreeBSD ports collection, which contains
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over 4000 third-party applications in a ready-to-install format.
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The ports collections shipped with FreeBSD 3.5.1 and 4.1.1 contain
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this problem since it was discovered after the releases.
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FreeBSD makes no claim about the security of these third-party
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applications, although an effort is underway to provide a security
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audit of the most security-critical ports.
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III. Impact
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Remote users may view any file on the system that is accessible by the
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webserver account. In addition, the webserver account may be
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compromised due to the execution of arbitrary files outside the
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document root.
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If you have not chosen to install the boa port/package, then your
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system is not vulnerable to this problem.
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IV. Workaround
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Deinstall the boa port/package, if you you have installed it.
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V. Solution
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One of the following:
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1) Upgrade your entire ports collection and rebuild the boa port.
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2) Deinstall the old package and install a new package dated after the
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correction date, obtained from:
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/www/boa-0.94.8.3.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/www/boa-0.94.8.3.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/www/boa-0.94.8.3.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/www/boa-0.94.8.3.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/www/boa-0.94.8.3.tgz
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3) download a new port skeleton for the cvsweb port from:
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http://www.freebsd.org/ports/
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and use it to rebuild the port.
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4) Use the portcheckout utility to automate option (3) above. The
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portcheckout port is available in /usr/ports/devel/portcheckout or the
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package can be obtained from:
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz
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