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)
103 lines
4 KiB
Text
103 lines
4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-02:14 Security Advisory
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FreeBSD, Inc.
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Topic: pam-pgsql port authentication bypass
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Category: ports
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Module: pam-pgsql
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Announced: 2002-03-12
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Credits: Jacques A. Vidrine <nectar@FreeBSD.org>
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Affects: pam-pgsql port prior to pam-pgsql-0.5.2
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Corrected: 2002-01-21 20:06:05 UTC
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FreeBSD only: NO
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I. Background
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pam-pgsql is a PAM module which allows PAM-enabled applications such
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as login(1) to use a PostgreSQL database for user authentication.
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II. Problem Description
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The affected versions of the pam-pgsql port contain a vulnerability
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that may allow a remote user to cause arbitrary SQL code to be
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executed. pam-pgsql constructs a SQL statement to be executed by the
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PostgreSQL server in order to lookup user information, verify user
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passwords, and change user passwords. The username and password given
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by the user is inserted into the SQL statement without any quoting or
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other safety checks.
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The pam-pgsql port is not installed by default, nor is it "part of
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FreeBSD" as such: it is part of the FreeBSD ports collection, which
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contains thousands of third-party applications in a ready-to-install
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format. The ports collection shipped with FreeBSD 4.4 contains this
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problem since it was discovered after the release.
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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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A user interacting with a PAM-enabled application may insert arbitrary
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SQL code into the username or password fields during authentication or
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while changing passwords, leading to several exploit opportunities.
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In all versions of the pam-pgsql port prior to 0.5.2, attackers may
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add or change user account records. In addition, in versions of the
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pam-pgsql port prior to 0.3, attackers may cause pam-pgsql to
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completely bypass password authentication, allowing them to
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authenticate as any user and obtain unauthorized access using the
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PAM-enabled application. Since common PAM applications include
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login(1) and sshd(8), both local and remote attacks are possible.
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IV. Workaround
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1) Deinstall the pam-pgsql port/package if you have it installed.
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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 port.
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2) Download a new port skeleton for the pam-pgsql 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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3) Use the portcheckout utility to automate option (2) 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-4-stable/Latest/portcheckout.tgz
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in the FreeBSD Ports Collection.
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Path Revision
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- -------------------------------------------------------------------------
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ports/security/pam-pgsql/Makefile 1.9
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ports/security/pam-pgsql/distinfo 1.3
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ports/security/pam-pgsql/pkg-descr 1.2
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- -------------------------------------------------------------------------
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VII. References
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This vulnerability is very similar to previous vulnerabilities
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involving Apache modules and discovered by RUS-CERT.
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<URL:http://cert.uni-stuttgart.de/advisories/apache_auth.php>
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