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)
105 lines
3.6 KiB
Text
105 lines
3.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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=============================================================================
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FreeBSD-SA-02:19 Security Advisory
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FreeBSD, Inc.
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Topic: squid heap buffer overflow in DNS handling
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Category: ports
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Module: squid24
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Announced: 2002-03-26
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Credits: zen-parse <zen-parse@gmx.net>
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Affects: squid port prior to version 2.4_9
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Corrected: 2002-03-22 00:19:55 UTC
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FreeBSD only: NO
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I. Background
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The Squid Internet Object Cache is a web proxy/cache.
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II. Problem Description
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Incorrect handling of compressed DNS responses could result in a
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heap buffer overflow.
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The squid 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 4.5 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 malicious DNS server (or an attacker spoofing a DNS server) could
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respond to DNS requests from squid with a specially crafted answer
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that would trigger the heap buffer overflow bug. This could crash the
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squid process. This bug is not known to be exploitable.
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IV. Workaround
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1) Deinstall the squid 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) Deinstall the old package and install a new package dated after the
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correction date, obtained from the following directories:
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[i386]
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/www/
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/www/
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[alpha]
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Packages are not automatically generated for the alpha architecture at
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this time due to lack of build resources.
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NOTE: It may be several days before updated packages are available.
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3) Download a new port skeleton for the squid 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-4-stable/Latest/portcheckout.tgz
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ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/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/www/squid24/Makefile 1.89
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ports/www/squid24/distinfo 1.64
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- -------------------------------------------------------------------------
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VII. References
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<URL:http://www.squid-cache.org/Advisories/SQUID-2002_2.txt>
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<URL:http://www.squid-cache.org/cgi-bin/cvsweb.cgi/squid/lib/rfc1035.c#rev1.24>
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<URL:http://www.squid-cache.org/cgi-bin/cvsweb.cgi/squid/lib/rfc1035.c#rev1.23>
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