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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.273 -- RHSA-2002:089-07 Relaxed LPRng job submission policy 11 June 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: LPRng Vendor: Red Hat Operating System: Red Hat Linux 7.0 Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3 Platform: Alpha i386 IA-64 Impact: Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Relaxed LPRng job submission policy Advisory ID: RHSA-2002:089-07 Issue date: 2002-05-16 Updated on: 2002-06-09 Product: Red Hat Linux Keywords: LPRng Cross references: Obsoletes: RHSA-2001:077 CVE Names: CAN-2002-0378 - --------------------------------------------------------------------- 1. Topic: The LPRng print spooler, as shipped in Red Hat Linux 7.x, accepts all remote print jobs by default. 2. Relevant releases/architectures: Red Hat Linux 7.0 - alpha, i386 Red Hat Linux 7.1 - alpha, i386, ia64 Red Hat Linux 7.2 - i386, ia64 Red Hat Linux 7.3 - i386 3. Problem description: With its default configuration, LPRng will accept job submissions from any host, which is not appropriate in a workstation environment. We are grateful to Matthew Caron for pointing out this configuration problem. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0378 to this issue. The updated packages from this advisory change the job submission policy (in /etc/lpd.perms) so that jobs from remote hosts are refused by default. Those running print servers may want to adjust this policy as appropriate, for example to give access to certain hosts or subnets. For details on how to do this see the lpd.perms(5) man page. Since Red Hat Linux 7.1, default installations include ipchains rules blocking remote access to the print spooler IP port; as a result those installations already reject remote job submissions. However, Red Hat Linux 7 machines and any machine upgraded to a later release (as opposed to having been freshly installed) will not have ipchains rules in place by default. IMPORTANT: There are special instructions for installing this update at the end of the "Solution" section below. 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. After upgrading, you should check that the new configuration file is activated. To do this, type the following command: grep "X NOT SERVER" /etc/lpd.perms If this commad returns no output, you will need to put the new configuration file in place by typing: mv /etc/lpd.perms.rpmnew /etc/lpd.perms 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): 6. RPMs required: Red Hat Linux 7.0: SRPMS: ftp://updates.redhat.com/7.0/en/os/SRPMS/LPRng-3.7.4-23.1.src.rpm alpha: ftp://updates.redhat.com/7.0/en/os/alpha/LPRng-3.7.4-23.1.alpha.rpm i386: ftp://updates.redhat.com/7.0/en/os/i386/LPRng-3.7.4-23.1.i386.rpm Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/LPRng-3.7.4-23.1.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/LPRng-3.7.4-23.1.alpha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/LPRng-3.7.4-23.1.i386.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/LPRng-3.7.4-23.1.ia64.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/LPRng-3.7.4-28.1.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/LPRng-3.7.4-28.1.i386.rpm ia64: ftp://updates.redhat.com/7.2/en/os/ia64/LPRng-3.7.4-28.1.ia64.rpm Red Hat Linux 7.3: SRPMS: ftp://updates.redhat.com/7.3/en/os/SRPMS/LPRng-3.8.9-4.src.rpm i386: ftp://updates.redhat.com/7.3/en/os/i386/LPRng-3.8.9-4.i386.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 69f458cca66118c3516a836fe81bea0c 7.0/en/os/SRPMS/LPRng-3.7.4-23.1.src.rpm a48b696acd1d993e0ed0592ec06e14c0 7.0/en/os/alpha/LPRng-3.7.4-23.1.alpha.rpm 5443ead6739e417c77b4ce4af28124cc 7.0/en/os/i386/LPRng-3.7.4-23.1.i386.rpm 69f458cca66118c3516a836fe81bea0c 7.1/en/os/SRPMS/LPRng-3.7.4-23.1.src.rpm a48b696acd1d993e0ed0592ec06e14c0 7.1/en/os/alpha/LPRng-3.7.4-23.1.alpha.rpm 5443ead6739e417c77b4ce4af28124cc 7.1/en/os/i386/LPRng-3.7.4-23.1.i386.rpm cbd09b4ebd705011785c4ffdf63bde74 7.1/en/os/ia64/LPRng-3.7.4-23.1.ia64.rpm 33bad25aff0a6ea45564acac4a3843da 7.2/en/os/SRPMS/LPRng-3.7.4-28.1.src.rpm 0940df47e5a6a33c1bdeac9d0d2d29e7 7.2/en/os/i386/LPRng-3.7.4-28.1.i386.rpm 89d7d9f82d2425cc7221665110045260 7.2/en/os/ia64/LPRng-3.7.4-28.1.ia64.rpm 0a63596e6de46f9e32c2dd3b025c68a5 7.3/en/os/SRPMS/LPRng-3.8.9-4.src.rpm a6d4b8b6cb30cddb686c102e27997d6d 7.3/en/os/i386/LPRng-3.8.9-4.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0378 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 member emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPQYKkSh9+71yA2DNAQED7wP/e8umtW3OZ26Om07VnbC/vLirdgyECVXB 3uytfoAfATeIjzRI7Vsqclsf3IIMqXgk3u/riJuy360ZiILGwtklzzImioUYVxt/ AzJcV1CxHF6fK3H6ypP7nKcUYtoyjsRYvpPIe1RgHYE5TOxmw6uSdyF0fFRyJL3f L12wX9ybQOM= =gyNm -----END PGP SIGNATURE-----