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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.155 -- FreeBSD-SA-02:19.squid squid heap buffer overflow in DNS handling 27 March 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: squid prior to version 2.4_9 Vendor: FreeBSD Ports Collection Operating System: FreeBSD Linux UNIX Platform: i386 Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:19 Security Advisory FreeBSD, Inc. Topic: squid heap buffer overflow in DNS handling Category: ports Module: squid24 Announced: 2002-03-26 Credits: zen-parse <zen-parse@gmx.net> Affects: squid port prior to version 2.4_9 Corrected: 2002-03-22 00:19:55 UTC FreeBSD only: NO I. Background The Squid Internet Object Cache is a web proxy/cache. II. Problem Description Incorrect handling of compressed DNS responses could result in a heap buffer overflow. The squid port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains thousands of third- party applications in a ready-to-install format. The ports collection shipped with FreeBSD 4.5 contains this problem since it was discovered after the release. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact A malicious DNS server (or an attacker spoofing a DNS server) could respond to DNS requests from squid with a specially crafted answer that would trigger the heap buffer overflow bug. This could crash the squid process. This bug is not known to be exploitable. IV. Workaround 1) Deinstall the squid port/package if you have it installed. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from the following directories: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/www/ ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/www/ [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. NOTE: It may be several days before updated packages are available. 3) Download a new port skeleton for the squid port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/Latest/portcheckout.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/Latest/portcheckout.tgz VI. Correction details The following list contains the revision numbers of each file that was corrected in the FreeBSD ports collection. Path Revision - - ------------------------------------------------------------------------- ports/www/squid24/Makefile 1.89 ports/www/squid24/distinfo 1.64 - - ------------------------------------------------------------------------- VII. References <URL:http://www.squid-cache.org/Advisories/SQUID-2002_2.txt> <URL:http://www.squid-cache.org/cgi-bin/cvsweb.cgi/squid/lib/rfc1035.c#rev1.24> <URL:http://www.squid-cache.org/cgi-bin/cvsweb.cgi/squid/lib/rfc1035.c#rev1.23> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPKDNPVUuHi5z0oilAQGQJQP+KfkRVCuIlwzQazMv7K6+KAIAwBkm2EdZ lVA2MCnzfxtWW23ZGIRnE6gW2gzzT4C3Ccrkg4llriVCIj4rdQ08UOSqF9JAZBWV 2RfYdTMUSeHEgYbkn0od9xeGc8zW3VltCH/I3ky/StWmMZv5eH9j6mPBddEeQG/y Nuz/Ms0oJrI= =m4VV - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPKG8Uih9+71yA2DNAQHQewP/cCtjaIGfDO8kWZN3n2rAn5AY5LinUXFk tXgMdFWn8xchzFOBBQxm+p3mEv5dJyOS4+UP2NDBPgZ9feCb9xCnHS58cyDn4xlV GAQacJaABYP7fUmnrJrEHgb+/OJG8YrbipBTe1z2Hsj2fXBBwUrlaVuxbSh9Wr6h xi306frdjes= =tD1C -----END PGP SIGNATURE-----