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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2000.304 -- RHSA-2000:086-05 ypbind for Red Hat Linux 5.x, 6.x has a local root exploit 25 October 2000 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ypbind Vendor: Red Hat Operating System: Red Hat Linux 5.X, 6.X Impact: Root Compromise Access Required: Local - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: ypbind for Red Hat Linux 5.x, 6.x has a local root exploit Advisory ID: RHSA-2000:086-05 Issue date: 2000-10-16 Updated on: 2000-10-23 Product: Red Hat Linux Keywords: ypbind string format buffer overflow syslog Cross references: N/A - --------------------------------------------------------------------- 1. Topic: ypbind as shipped in Red Hat Linux 5.x and 6.x is vulnerable to a local root exploit. All systems making use of NIS services are encouraged to upgrade. 2. Relevant releases/architectures: Red Hat Linux 5.0 - i386, alpha, sparc Red Hat Linux 5.1 - i386, alpha, sparc Red Hat Linux 5.2 - i386, alpha, sparc Red Hat Linux 6.0 - i386, alpha, sparc Red Hat Linux 6.1 - i386, alpha, sparc Red Hat Linux 6.2 - i386, alpha, sparc Red Hat Linux 6.2EE - i386, alpha, sparc 3. Problem description: Systems using Network Information Service, or NIS, use a daemon called ypbind to request information from a NIS server. This information is then used by the local machine. The logging code in ypbind is vulnerable to a printf string format attack which an attacker could exploit by passing ypbind a carefully crafted request. This attack can successfully lead to local root access. This problem has been corrected with these new packages. 4. Solution: If you do not use NIS, you should remove ypbind: rpm -e ypbind Otherwise, for each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. You should then make sure that the new ypbind is running by issuing: /etc/rc.d/init.d/ypbind restart 5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info): N/A 6. RPMs required: Red Hat Linux 5.x: alpha: ftp://updates.redhat.com/5.2/alpha/ypbind-3.3-10.alpha.rpm sparc: ftp://updates.redhat.com/5.2/sparc/ypbind-3.3-10.sparc.rpm i386: ftp://updates.redhat.com/5.2/i386/ypbind-3.3-10.i386.rpm sources: ftp://updates.redhat.com/5.2/SRPMS/ypbind-3.3-10.src.rpm Red Hat Linux 6.x: alpha: ftp://updates.redhat.com/6.2/alpha/ypbind-1.7-0.6.x.alpha.rpm sparc: ftp://updates.redhat.com/6.2/sparc/ypbind-1.7-0.6.x.sparc.rpm i386: ftp://updates.redhat.com/6.2/i386/ypbind-1.7-0.6.x.i386.rpm sources: ftp://updates.redhat.com/6.2/SRPMS/ypbind-1.7-0.6.x.src.rpm 7. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 507ff0e63468e829b2c917789ba2fedd 5.2/SRPMS/ypbind-3.3-10.src.rpm 127274f9828d27f895e8d8eee8d38db6 5.2/alpha/ypbind-3.3-10.alpha.rpm 7bbf68a42a3c996c6f69b5ffaf2911f7 5.2/i386/ypbind-3.3-10.i386.rpm 3d0cd8b8700182b9b815525e1f99c82d 5.2/sparc/ypbind-3.3-10.sparc.rpm d8caa439a1b6c7b26f843bacd01c65f8 6.2/SRPMS/ypbind-1.7-0.6.x.src.rpm 3a426e3060d31aa37b2a41d973ac3f63 6.2/alpha/ypbind-1.7-0.6.x.alpha.rpm 411017238af9a0a8891bd3078547336c 6.2/i386/ypbind-1.7-0.6.x.i386.rpm 3beff51d6a0292fd9d50fe24d07097ac 6.2/sparc/ypbind-1.7-0.6.x.sparc.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: http://www.redhat.com/corp/contact.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: N/A Copyright(c) 2000 Red Hat, Inc. - --------------------------END INCLUDED TEXT-------------------- 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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