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Red Hat Linux "ypbind" Vulnerability
Red Hat Linux "ypbind" Vulnerability Privacy and Legal Notice


L-009: Red Hat Linux "ypbind" Vulnerability

October 23, 2000 23:00 GMT
PROBLEM:       Red Hat has identified a vulnerability in "ypbind".
PLATFORM:      Red Hat Linux 5.x and 6.x
DAMAGE:        The logging code in "ypbind" is vulnerable to a printf string
               format attack that may lead to local root access.
SOLUTION:      If not needed remove "ypbind" or apply appropriate patches as
               indicated below.

VULNERABILITY Risk is MEDIUM. The vulnerability affects system security and ASSESSMENT: is publicly known. All systems making use of NIS services are encouraged to upgrade.
[****** Start Red Hat Security Advisory ******] --------------------------------------------------------------------- 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 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: N/A Copyright(c) 2000 Red Hat, Inc. [****** End Red Hat Security Advisory ******]

CIAC wishes to acknowledge the contributions of Red Hat, Inc. for the information contained in this bulletin.

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