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)
98 lines
3.6 KiB
Text
98 lines
3.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-00:20 Security Advisory
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FreeBSD, Inc.
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Topic: krb5 port contains remote and local root exploits.
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Category: ports
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Module: krb5
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Announced: 2000-05-26
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Credits: Jeffrey I. Schiller <jis@MIT.EDU>
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Affects: Ports collection prior to the correction date
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Corrected: 2000-05-17
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Vendor status: Patch released
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FreeBSD only: NO
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I. Background
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MIT Kerberos 5 is an implementation of the Kerberos 5 protocol which
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is available in the FreeBSD ports collection as the security/krb5
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port. FreeBSD also includes separately-developed Kerberos 4 and 5
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implementations from KTH, which are optionally installed as part of
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the base system (KTH Heimdal, the Kerberos 5 implementation, is
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currently considered "experimental" software).
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II. Problem Description
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The MIT Kerberos 5 port, versions 1.1.1 and earlier, contains several
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remote and local buffer overflows which can lead to root compromise.
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Note that the implementations of Kerberos shipped in the FreeBSD base
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system are separately-developed software to MIT Kerberos and are
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believed not to be vulnerable to these problems.
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However, a very old release of FreeBSD dating from 1997 (FreeBSD
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2.2.5) did ship with a closely MIT-derived Kerberos implementation
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("eBones") and may be vulnerable to attacks of the kind described
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here. Any users still using FreeBSD 2.2.5 and who have installed the
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optional Kerberos distribution are urged to upgrade to 2.2.8-STABLE or
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later. Note however that FreeBSD 2.x is no longer an officially
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supported version, nor are security fixes always provided.
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The krb5 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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nearly 3300 third-party applications in a ready-to-install format. The
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ports collection shipped with FreeBSD 4.0 contains this problem since
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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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Local or remote users can obtain root access on the system running krb5.
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If you have not chosen to install the krb5 port, then your system is
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not vulnerable to this problem.
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IV. Workaround
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Due to the nature of the vulnerability there are several programs and
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network services which are affected. If recompiling the port is not
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practical, please see the MIT Kerberos advisory for suggested
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workarounds (including the disabling or adjustment of services and
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removal of setuid permissions on vulnerable binaries). The advisory
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can be found at the following location:
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http://web.mit.edu/kerberos/www/advisories/krb4buf.txt
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V. Solution
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1) Upgrade your entire ports collection and rebuild the krb5 port. A
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package is not provided for this port for export control reasons.
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2) download a new port skeleton for the krb5 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 (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/packages/devel/portcheckout-1.0.tgz
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