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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2001.469 -- RHSA-2001:132-04 New util-linux packages available to fix /bin/login pam problem 7 November 2001 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: /bin/login Vendor: Red Hat Operating System: Red Hat Linux 7.2 Red Hat Linux 7.1 Platform: Alpha i386 IA-64 Impact: Inappropriate Access Reduced Security Access Required: Remote Ref: ESB-2001.432 - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: New util-linux packages available to fix /bin/login pam problem Advisory ID: RHSA-2001:132-04 Issue date: 2001-10-11 Updated on: 2001-10-16 Product: Red Hat Linux Keywords: login pam pam_limits Cross references: Obsoletes: RHSA-2001:095-04 - --------------------------------------------------------------------- 1. Topic: New util-linux packages are available that fix a problem with /bin/login's PAM implementation. This could, in some non-default setups, cause users to receive credentials of other users. It is recommended that all users update to the fixed packages. 2001-10-22: Packages are now available for Red Hat Linux 7.2. Notably, these packages also fix the problem noted in RHSA-2001:095-04 (vipw incorrectly setting permissions on some files) - this bug was accidentally reintroduced in Red Hat Linux 7.2. 2. Relevant releases/architectures: Red Hat Linux 7.1 - alpha, i386, ia64 Red Hat Linux 7.2 - i386 3. Problem description: A problem existed in /bin/login's PAM implementation; it stored the value of a static pwent buffer across PAM calls; when used with some PAM modules in non-default configuration (such as pam_limits), it would overwrite the buffer, causing a user to get credentials of another user. Thanks go to Tarhon-Onu Victor <mituc@ac.tuiasi.ro> for bringing the problem to our attention, and to Olaf Kirch <okir@caldera.de> for providing the patch. 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): 51646 - pam limits drops other user privileges 6. RPMs required: Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/util-linux-2.11f-11.7.1.src.rpm alpha: ftp://updates.redhat.com/7.1/en/os/alpha/util-linux-2.11f-11.7.1.alpha.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/util-linux-2.11f-11.7.1.i386.rpm ia64: ftp://updates.redhat.com/7.1/en/os/ia64/util-linux-2.11f-11.7.1.ia64.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/util-linux-2.11f-12.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/util-linux-2.11f-12.i386.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- db33b22f50978471a25fd5cc973f8f54 7.1/en/os/SRPMS/util-linux-2.11f-11.7.1.src.rpm d55f6ec42e3c0268f2ab4decb24deb53 7.1/en/os/alpha/util-linux-2.11f-11.7.1.alpha.rpm 2bf1db1cadc50f783220f70aa2b7a09c 7.1/en/os/i386/util-linux-2.11f-11.7.1.i386.rpm 568c4ec61cb9cc0ebd6313fb14d0419c 7.1/en/os/ia64/util-linux-2.11f-11.7.1.ia64.rpm 3b5448a60fa6cb5580eb690a303827a5 7.2/en/os/SRPMS/util-linux-2.11f-12.src.rpm c0f329c070e416fbb20c97670199d3fe 7.2/en/os/i386/util-linux-2.11f-12.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: 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). 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