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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.030 -- RHSA-2002:005-09 Updated xchat packages are available 18 January 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: xchat Vendor: Red Hat Operating System: Red Hat Linux 6.2 Red Hat Linux 7.0 Red Hat Linux 7.1 Red Hat Linux 7.2 Platform: Alpha i386 IA-64 SPARC Impact: Execute Arbitrary Code/Commands Access Required: Remote Ref: ESB-2002.015 - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Updated xchat packages are available Advisory ID: RHSA-2002:005-09 Issue date: 2002-01-07 Updated on: 2002-01-14 Product: Red Hat Linux Keywords: xchat irc chat Cross references: Obsoletes: - --------------------------------------------------------------------- 1. Topic: Versions of xchat prior to version 1.8.7 contain a vulnerability which allows an attacker to cause a vulnerable client to execute arbitrary IRC server commands as if the vulnerable user had typed them. This security erratum updates xchat to version 1.8.7, which is not vulnerable to this attack. 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 Red Hat Linux 7.2 - i386, ia64 3. Problem description: xchat is a popular IRC client. Recently xchat has been found to contain a bug in the CTCP PING handling code which can be exploited to execute IRC commands on the IRC server as the vulnerable user. This can be used for example by an attacker to /op or /deop, to /kick someone out of a channel, to force the vulnerable user out of the channel with a /part, to change channel modes via the /mode command, or to impersonate a user via private /msg commands. This bug does not appear to allow an attacker to execute commands on the vulnerable computer, just to force IRC server commands to be run as if the vulnerable user had typed them. All previous versions of xchat are vulnerable, however only the 1.4.* versions are vulnerable by default. With later versions (1.6.*, 1.8.*), xchat is not vulnerable unless the user has enabled the client side "percascii" variable with the command "/set percascii 1". This security erratum updates xchat to version 1.8.7, for Red Hat Linux 6.2, 7.0, 7.1, 7.2, which is not vulnerable to this attack. All xchat users should update to this release. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0006 to this issue. Thanks to zen-parse for discovering and reporting this problem, and also to Marcus Meissner at Caldera for providing a working sample exploit with which to easily test for affected versions. 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): 6. RPMs required: Red Hat Linux 6.2: SRPMS: ftp://updates.redhat.com/6.2/en/os/SRPMS/xchat-1.8.7-1.62.0.src.rpm alpha: ftp://updates.redhat.com/6.2/en/os/alpha/xchat-1.8.7-1.62.0.alpha.rpm i386: ftp://updates.redhat.com/6.2/en/os/i386/xchat-1.8.7-1.62.0.i386.rpm sparc: ftp://updates.redhat.com/6.2/en/os/sparc/xchat-1.8.7-1.62.0.sparc.rpm Red Hat Linux 7.0: SRPMS: ftp://updates.redhat.com/7.0/en/os/SRPMS/xchat-1.8.7-1.70.0.src.rpm alpha: ftp://updates.redhat.com/7.0/en/os/alpha/xchat-1.8.7-1.70.0.alpha.rpm i386: ftp://updates.redhat.com/7.0/en/os/i386/xchat-1.8.7-1.70.0.i386.rpm Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/xchat-1.8.7-1.71.0.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/xchat-1.8.7-1.71.0.alpha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/xchat-1.8.7-1.71.0.i386.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/xchat-1.8.7-1.71.0.ia64.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/xchat-1.8.7-1.72.0.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/xchat-1.8.7-1.72.0.i386.rpm ia64: ftp://updates.redhat.com/7.2/en/os/ia64/xchat-1.8.7-1.72.0.ia64.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- ac50d03c3107cb7c57823330abb7bcf3 6.2/en/os/SRPMS/xchat-1.8.7-1.62.0.src.rpm 33c2a42aac216fe2d5cc1703d62916c3 6.2/en/os/alpha/xchat-1.8.7-1.62.0.alpha.rpm e2730124e349c81d884b9f6b9f10a844 6.2/en/os/i386/xchat-1.8.7-1.62.0.i386.rpm dee6de9b586d5d480e3fb79095071c81 6.2/en/os/sparc/xchat-1.8.7-1.62.0.sparc.rpm 8abf9f7305c6ef0bb2fd271cd5a658c7 7.0/en/os/SRPMS/xchat-1.8.7-1.70.0.src.rpm e6f6e39866ea16e685e40d0aefea8d3a 7.0/en/os/alpha/xchat-1.8.7-1.70.0.alpha.rpm f86ff922b3983fcc466c809026d2e46f 7.0/en/os/i386/xchat-1.8.7-1.70.0.i386.rpm 097d9021c9a71802e6500e8b517afab4 7.1/en/os/SRPMS/xchat-1.8.7-1.71.0.src.rpm 561f00afdd626a0bff8adc0f0eae62a6 7.1/en/os/alpha/xchat-1.8.7-1.71.0.alpha.rpm a7623f3a3962701985ffdaca0398edc5 7.1/en/os/i386/xchat-1.8.7-1.71.0.i386.rpm 6e6c9835b80644a8e720a7947dcc4af2 7.1/en/os/ia64/xchat-1.8.7-1.71.0.ia64.rpm 742b12acb62b256309223076098b8169 7.2/en/os/SRPMS/xchat-1.8.7-1.72.0.src.rpm 749cc3d90b7e7a8446b444446855b672 7.2/en/os/i386/xchat-1.8.7-1.72.0.i386.rpm 1beaae5afb495e11aa532bb7f76faa47 7.2/en/os/ia64/xchat-1.8.7-1.72.0.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0006 http://marc.theaimsgroup.com/?l=bugtraq&m=101060676210255 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. 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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 iQCVAwUBPEg0aCh9+71yA2DNAQFBQwP+Iifx9VxpCCP6SZ4A67grtU/qiBhQlMdM 7A/0myfyjOveHeNIiYOT/04wQc5gkAgeyhBggOqgBvKXLTPGuWa9hweBf3ytFpd5 GOdxCnTNDn4Ke6d3/x91JTWBMGg+cdnBskgyjeJU6z8EWZhsF2AFNxcezu+DjbOv k1COz69M8AI= =wipM -----END PGP SIGNATURE-----