Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2010.0294 Low: squid security and bug fix update 31 March 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: squid Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 5 Red Hat Enterprise Linux WS/Desktop 5 Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2010-0308 CVE-2009-2855 Reference: ASB-2010.0040.2 ASB-2009.1068.2 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2010-0221.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Low: squid security and bug fix update Advisory ID: RHSA-2010:0221-04 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0221.html Issue date: 2010-03-30 CVE Names: CVE-2009-2855 CVE-2010-0308 ===================================================================== 1. Summary: An updated squid package that fixes two security issues and several bugs is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having low security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: RHEL Desktop Workstation (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 3. Description: Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects. A flaw was found in the way Squid processed certain external ACL helper HTTP header fields that contained a delimiter that was not a comma. A remote attacker could issue a crafted request to the Squid server, causing excessive CPU use (up to 100%). (CVE-2009-2855) Note: The CVE-2009-2855 issue only affected non-default configurations that use an external ACL helper script. A flaw was found in the way Squid handled truncated DNS replies. A remote attacker able to send specially-crafted UDP packets to Squid's DNS client port could trigger an assertion failure in Squid's child process, causing that child process to exit. (CVE-2010-0308) This update also fixes the following bugs: * Squid's init script returns a non-zero value when trying to stop a stopped service. This is not LSB compliant and can generate difficulties in cluster environments. This update makes stopping LSB compliant. (BZ#521926) * Squid is not currently built to support MAC address filtering in ACLs. This update includes support for MAC address filtering. (BZ#496170) * Squid is not currently built to support Kerberos negotiate authentication. This update enables Kerberos authentication. (BZ#516245) * Squid does not include the port number as part of URIs it constructs when configured as an accelerator. This results in a 403 error. This update corrects this behavior. (BZ#538738) * the error_map feature does not work if the same handling is set also on the HTTP server that operates in deflate mode. This update fixes this issue. (BZ#470843) All users of squid should upgrade to this updated package, which resolves these issues. After installing this update, the squid service will be restarted automatically. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 496170 - Add arp filter option 516245 - negotiate support not enabled in squid (for kerberized sso) 518182 - CVE-2009-2855 DoS (100% CPU use) while processing certain external ACL helper HTTP headers 521926 - squid 'stop after stop' is not LSB compliant 538738 - Squid accelerator mode works only if port 80 is opened 556389 - CVE-2010-0308 squid: temporary DoS (assertion failure) triggered by truncated DNS packet (SQUID-2010:1) 6. Package List: RHEL Desktop Workstation (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/squid-2.6.STABLE21-6.el5.src.rpm i386: squid-2.6.STABLE21-6.el5.i386.rpm squid-debuginfo-2.6.STABLE21-6.el5.i386.rpm x86_64: squid-2.6.STABLE21-6.el5.x86_64.rpm squid-debuginfo-2.6.STABLE21-6.el5.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/squid-2.6.STABLE21-6.el5.src.rpm i386: squid-2.6.STABLE21-6.el5.i386.rpm squid-debuginfo-2.6.STABLE21-6.el5.i386.rpm ia64: squid-2.6.STABLE21-6.el5.ia64.rpm squid-debuginfo-2.6.STABLE21-6.el5.ia64.rpm ppc: squid-2.6.STABLE21-6.el5.ppc.rpm squid-debuginfo-2.6.STABLE21-6.el5.ppc.rpm s390x: squid-2.6.STABLE21-6.el5.s390x.rpm squid-debuginfo-2.6.STABLE21-6.el5.s390x.rpm x86_64: squid-2.6.STABLE21-6.el5.x86_64.rpm squid-debuginfo-2.6.STABLE21-6.el5.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://www.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2009-2855.html https://www.redhat.com/security/data/cve/CVE-2010-0308.html http://www.redhat.com/security/updates/classification/#low 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://www.redhat.com/security/team/contact/ Copyright 2010 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFLsi4bXlSAg2UNWIIRAvlyAJ9WvFarx8zhoLaZ8o5MPa6g7BBWlACgty4x cNJHsh6qrBPqWOCdJp8XtUM= =BJgW - -----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. 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. NOTE: Third Party Rights 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 follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. 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 author's website 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/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 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 member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iD8DBQFLsrcp/iFOrG6YcBERAqldAJ9miznGhuVvonsZUH5X8zAoIVVP2gCfaraw C2x/S3hvFZqQSYvI1Y0APGQ= =2Ytt -----END PGP SIGNATURE-----