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Red Hat 6.2 RHSA-2000:048-02 Critical: Mailx Local Access Exploit

Updated perl and mailx package are now available which fix a potentialexploit made possible by incorrect assumptions made in suidperl.. ` --------------------------------------------------------------------- Red Hat, Inc. Security Advisory Synopsis: Updated mailx and perl packages are now available. Advisory ID: RHSA-2000:048-02 Issue date: 2000-08-07 Updated on: 2000-08-08 Product: Red Hat Linux Keywords: perl suid Cross references: N/A --------------------------------------------------------------------- 1. Topic: Updated perl and mailx package are now available which fix a potential exploit made possible by incorrect assumptions made in suidperl. 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 6.2E - i386, alpha, sparc 3. Problem description: Under certain conditions, suidperl will attempt to send mail to the local superuser account using /bin/mail. A properly formatted exploit script can use this facility, along with mailx's tendency to inherit settings from the environment, to gain local root access. This update changes suidperl's behavior to use syslog instead of mail, and restricts the list of variables /bin/mail will read from the environment. 4. Solution: For each RPM for your particular architecture, run: rpm -Fvh [filename] where filename is the name of the RPM. 5. Bug IDs fixed ( for more info): 15625 - Root exploit alread posted on bugtraq 15630 - Root exploit in sperl 15641 - suidperl has a major problem 6. RPMs required: Red Hat Linux 5.0, 5.1, 5.2: sparc: alpha: i386: sources: Red Hat Linux 6.0, 6.1, 6.2: sparc: i386: alpha: sources: 7. Verification: MD5 sum PackageName -------------------------------------------------------------------------- c514911db4ce13fc32af5b59233d5dc9 5.2/SRPMS/mailx-8.1.1-16.src.rpm 7440313c13c65142c75e35d32b5807c3 5.2/SRPMS/perl-5.004m7-2.src.rpm 430fca595dd42648239b8ad475032c9c 5.2/alpha/mailx-8.1.1-16.alpha.rpm 876b94f7d4fd4d92142f44de51045591 5.2/alpha/perl-5.004m7-2.alpha.rpm fd9d44b8aeadc36bd871dd8e2d6211c4 5.2/i386/mailx-8.1.1-16.i386.rpm 0a1f47cacb891c03b351211d4fe825ed 5.2/i386/perl-5.004m7-2.i386.rpm 376f28398c607b4af12d06babbd7e098 5.2/sparc/mailx-8.1.1-16.sparc.rpm 24e61c42e5a22dbbc929264a1ddc3869 5.2/sparc/perl-5.004m7-2.sparc.rpm 30d2f82abfba4ac2c770b66c591d528f 6.2/SRPMS/mailx-8.1.1-16.src.rpm 5cfe855e78b1ed7672e4daa738093f2c 6.2/SRPMS/perl-5.00503-11.src.rpm 25497e13b1d30f3dcff365602f78208a 6.2/alpha/mailx-8.1.1-16.alpha.rpm 452714b1ddfd479cb683b21ca54d27a3 6.2/alpha/perl-5.00503-11.alpha.rpm c121c2076bae78f42afcf9f0357549b9 6.2/i386/mailx-8.1.1-16.i386.rpm ff573609cbe0de0fe72838b0139992da 6.2/i386/perl-5.00503-11.i386.rpm 6464e30268ba05a2ca938b38805a9256 6.2/sparc/mailx-8.1.1-16.sparc.rpm fa63980aed3bdd2c9c14dcca6745c56c 6.2/sparc/perl-5.00503-11.sparc.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 8. References: Login Copyright(c) 2000 Red Hat, Inc. `. Red Hat has announced important updates for mailx and perl to fix a serious local privilege escalation vulnerability. Explore the details of these security issues and their fixes. mailx update, local access exploit, perl security fix, red hat advisory. . Severity: Critical. LinuxSecurity.com Team

Aug 08, 2000 •Critical Red Hat