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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.311 -- RHSA-2002:117-11 Updated secureweb packages fix chunked encoding issue 28 June 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Red Hat Secure Web Server (apache) Vendor: Red Hat Operating System: Red Hat Linux Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote Ref: AA-2002.04 - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Updated secureweb packages fix chunked encoding issue Advisory ID: RHSA-2002:117-11 Issue date: 2002-06-18 Updated on: 2002-06-26 Product: Red Hat Secure Web Server Keywords: apache chunked encoding DoS Cross references: RHSA-2002:103 Obsoletes: RHSA-2002:042 CVE Names: CAN-2002-0392 - --------------------------------------------------------------------- 1. Topic: The Apache Web server contains a security vulnerability which can be used to launch a denial of service attack, or in some cases, allow remote code execution. Red Hat Secure Web server is based on the Apache Web server and the secureweb package has been updated to fix this denial of service vulnerability. 2. Relevant releases/architectures: Red Hat Secure Web Server 3.2 - i386 3. Problem description: Versions of the Apache Web server up to and including 1.3.24 contain a bug in the routines which deal with requests that are processed with "chunked" encoding. A carefully crafted invalid request can cause an Apache child process to call the memcpy() function in a way that will write past the end of its buffer, corrupting the stack. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0392 to this issue. Our investigations show that this bug cannot be used to gain remote access to a server running Red Hat Secure Web Server but it does cause the child process to die. The Apache parent process will notice this and start a new child process when necessary -- using slightly more resources than normal. All users of Secure Web Server should update to these errata packages to correct this security issue. NOTE: Pay special attention to the installation instructions in the "Solution" section below as they differ from standard upgrade instructions. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. Some of these files are distributed in rhmask format and may only be used by individuals who have purchased Red Hat Linux 6.2 Professional. To produce installable RPM files from the rhmask files, retrieve the rhmask files via ftp and type the following command: rhmask secureweb-3.2-12.i386.rpm secureweb-3.2.5-1.i386.rpm.rhmask The original RPM is located only on your Secure Web Server CD, and cannot be obtained via the Internet. Note: If you do not have the original RPM located in the same directory as the rhmask file, you will need to prefix the name of the RPM with the full path name to its location (for example, on your installation CD). 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. 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 6. RPMs required: Red Hat Secure Web Server 3.2: SRPMS: ftp://updates.redhat.com/other_prod/secureweb/3.2/SRPMS/secureweb-3.2.6-1.nosrc.rpm i386: ftp://updates.redhat.com/other_prod/secureweb/3.2/i386/secureweb-3.2.6-1.i386.rpm.rhmask ftp://updates.redhat.com/other_prod/secureweb/3.2/i386/secureweb-devel-3.2.6-1.i386.rpm ftp://updates.redhat.com/other_prod/secureweb/3.2/i386/secureweb-manual-3.2.6-1.i386.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 20dae29b7188c307cd495ee7509ff231 other_prod/secureweb/3.2/SRPMS/secureweb-3.2.6-1.nosrc.rpm 0ab5997be631fdee7d000b6d6767ed0d other_prod/secureweb/3.2/i386/secureweb-3.2.6-1.i386.rpm.rhmask eb4d09fb8452f62d02e443bdaea0bbd9 other_prod/secureweb/3.2/i386/secureweb-devel-3.2.6-1.i386.rpm 0ebbcd3faadd569717fb85caf5b18320 other_prod/secureweb/3.2/i386/secureweb-manual-3.2.6-1.i386.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://httpd.apache.org/info/security_bulletin_20020617.txt http://www.apacheweek.com/issues/02-06-21#security http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0392 Copyright(c) 2000, 2001, 2002 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. 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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. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPRxxuih9+71yA2DNAQH1nQP/fyYmOZrKhDW2vLr2AphOh2l4RtqV7gby jsx6jkd38Q3BBaY3KfJcMv3m3SD+TyaHcDAciEqojl1o5y+O5Vf+TzllM1Sys5Wi PnJMAB3PDS2IX+fGNuq8Jf5KhKcEhm1wHPXLGgUq/x42lSFd/rnpeKYQ9EPHu8tk bQlBlXGVR3g= =W0sR -----END PGP SIGNATURE-----