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Red Hat 6.x: RHSA-2000:002-01 Critical: Lpr Access Control Threat

New lpr packages are available to fix two security problems in lpd.. ` --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: New lpr packages available Advisory ID: RHSA-2000:002-01 Issue date: 2000-01-07 Updated on: 2000-01-07 Keywords: lpr lpd DNS sendmail Cross references: --------------------------------------------------------------------- 1. Topic: New lpr packages are available to fix two security problems in lpd. 2. Relevant releases/architectures: Red Hat Linux 4.x, all architectures Red Hat Linux 5.x, all architectures Red Hat Linux 6.x, all architectures 3. Problem description: Two security vulnerabilities exist in the lpd (line printer daemon) shipped with the lpr package. First, authentication was not thorough enough. If a remote user was able to control their own DNS so that their IP address resolved to the hostname of the print server, access would be granted, when it should not be. Secondly, it was possible in the control file of a print job to specify arguments to sendmail. By careful manipulation of control and data files, this could cause sendmail to be executed with a user-specified configuration file. This could lead very easily to a root compromise. It is recommended that all users of Red Hat Linux using the lpr package (which is required to print) upgrade to the fixed packages. Thanks go to DilDog (This email address is being protected from spambots. You need JavaScript enabled to view it.) for noting the vulnerability. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh where filename is the name of the RPM. 5. Bug IDs fixed ( for more info): 6. Obsoleted by: 7. Conflicts with: 8. RPMs required: Red Hat Linux 6.x: Intel: Alpha: Sparc: Source packages: Red Hat Linux 5.x: Intel: Alpha: Sparc: Source packages: Red Hat Linux 4.x: Intel: Alpha: Sparc: Source packages: 9. Verification: MD5 sum PackageName -------------------------------------------------------------------------- 78f2220331189e723eab944b53d0710e i386/lpr-0.48-1.i386.rpm 3fcb89eb1a76741a505d3eeeddfa3674 alpha/lpr-0.48-1.alpha.rpm 441cfee04428ca215d98d9ce3d20bc4d sparc/lpr-0.48-1.sparc.rpm 55c6a740b03569919ec08992257cad96 SRPMS/lpr-0.48-1.src.rpm 25ba4d2b49ff42403062d44f52f59947 i386/lpr-0.48-0.5.2.i386.rpm aa13284c581601705fef727565ed407e alpha/lpr-0.48-0.5.2.alpha.rpm 8d158ba104fadbfc84b5122f9564b2ed sparc/lpr-0.48-0.5.2.sparc.rpm 3d7a10a086f5bd5aea739ec41d761881 SRPMS/lpr-0.48-0.5.2.src.rpm a215955554df002e91e336abd310e3f1 i386/lpr-0.48-0.4.2.i386.rpm a96363769e3815a5a5bb40084d8fac61 alpha/lpr-0.48-0.4.2.alpha.rpm f56271b462851990238a24a5357c454f sparc/lpr-0.48-0.4.2.sparc.rpm 48453e0c888e3d124a6b50fbb9a89be9 SRPMS/lpr-0.48-0.4.2.src.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at: You can verify each package with the following command: rpm --checksig 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 10. References: `. New lpr enhancements have been released by Red Hat to address critical security flaws identified in the line printer daemon lpd.. Red Hat Linux,lpr package,security issues,line printer daemon,authentication flaw. . Severity: Critical. LinuxSecurity.com Team

Jan 11, 2000 •Critical Red Hat