Date: Mon, 23 Oct 2000 11:55:00 -0400
From: bugzilla@REDHAT.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [RHSA-2000:086-05] ypbind for Red Hat Linux 5.x, 6.x has a
local root exploit
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.