Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.464 -- RHSA-2001:113-02 New squid packages available to fix FTP-based DoS 2 November 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: squid Vendor: Red Hat Operating System: Red Hat Linux 6.2 Red Hat Linux 7.0 Red Hat Linux 7.1 Platform: Alpha i386 Sparc IA-64 Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: New squid packages available to fix FTP-based DoS Advisory ID: RHSA-2001:113-02 Issue date: 2001-09-25 Updated on: 2001-09-27 Product: Red Hat Linux Keywords: squid FTP DoS Cross references: Obsoletes: - --------------------------------------------------------------------- 1. Topic: New squid packages are available that fix a potential DoS in Squid's FTP handling code. It is recommened that squid users update to the fixed packages. The packages for Red Hat Linux 6.2 also fix the problem described in RHSA-2001:097-04; it was later discovered that Red Hat Linux 6.2 is vulnerable to the same problem in accelerator-only mode. 2. Relevant releases/architectures: Red Hat Linux 6.2 - alpha, i386, sparc Red Hat Linux 7.0 - alpha, i386 Red Hat Linux 7.1 - alpha, i386, ia64 3. Problem description: Certain FTP requests could cause the Squid daemon to abort, making it unavailable for a period of seconds. If enough of these requests are sent in a short period of time, the Squid daemon will not be restarted. Thanks go to Vladimir Ivaschenko for bringing this to our attention, and to Henrik Nordstrom and the Squid team for providing a fix. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 53906 - Squid allows all proxy requests in accelerator mode 6. RPMs required: Red Hat Linux 6.2: SRPMS: ftp://updates.redhat.com/6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm alpha: ftp://updates.redhat.com/6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm i386: ftp://updates.redhat.com/6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm sparc: ftp://updates.redhat.com/6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm Red Hat Linux 7.0: SRPMS: ftp://updates.redhat.com/7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm alpha: ftp://updates.redhat.com/7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm i386: ftp://updates.redhat.com/7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 92bf7d39e574dad6e6952b6b89851fe5 6.2/en/os/SRPMS/squid-2.3.STABLE4-10.6.2.src.rpm e693299406aba9b573354fe29e998a29 6.2/en/os/alpha/squid-2.3.STABLE4-10.6.2.alpha.rpm ca6952e0be177b25d0e90778ab456f6b 6.2/en/os/i386/squid-2.3.STABLE4-10.6.2.i386.rpm 505fbeeaaf873f52a51e8a0a3e5562ae 6.2/en/os/sparc/squid-2.3.STABLE4-10.6.2.sparc.rpm 2006fdfdc57bc09337be92a04583e00d 7.0/en/os/SRPMS/squid-2.3.STABLE4-10.7.0.src.rpm 0784ce226770a50c4f13640b6cc7d01e 7.0/en/os/alpha/squid-2.3.STABLE4-10.7.0.alpha.rpm a8d303d2743c0703d3bb2c6502488824 7.0/en/os/i386/squid-2.3.STABLE4-10.7.0.i386.rpm 08a518df230a1f9cf17ecbf2a273a4b8 7.1/en/os/SRPMS/squid-2.3.STABLE4-10.7.1.src.rpm fe4e72902f8aaf5dec0085c91b0b0e0d 7.1/en/os/alpha/squid-2.3.STABLE4-10.7.1.alpha.rpm c7e2f184cffdd911411aec7908c937d3 7.1/en/os/i386/squid-2.3.STABLE4-10.7.1.i386.rpm 5883320b3d07b2861122e631f59f8b24 7.1/en/os/ia64/squid-2.3.STABLE4-10.7.1.ia64.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/about/contact/pgpkey.html You can verify each package with the following command: rpm --checksig <filename> If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: rpm --checksig --nogpg <filename> 8. References: http://www.squid-cache.org/bugs/show_bug.cgi?id=233 Copyright(c) 2000, 2001 Red Hat, Inc. - --------------------------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. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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 iQCVAwUBO+KELih9+71yA2DNAQFDiAP8DfPg5KDFtJ8AkC0n3Qlzio4HtJ/ahkA7 uXr4SIOQCvsiJq529UwNCzLaaSwhLaJjVYWqivwdWPmn53HzAtQ0KjRVqgushyyT vlz+Zz5HkKaWtlgfBlCOOhPRaiF7rZM4gbBDxrTi1eV/9vzhoVFAAGSK1Z23KiAz foZqXEYq59I= =YSdo -----END PGP SIGNATURE-----