---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          glibc local write access vulnerability
Advisory ID:       RHSA-2001:002-03
Issue date:        2001-01-15
Updated on:        2001-01-16
Product:           Red Hat Linux
Keywords:          glibc LD_PRELOAD SEGFAULT_OUTPUT_NAME
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

A bug in GNU C Library allows unprivileged user to preload libraries
located in /lib or /usr/lib directories into SUID programs even if those
libraries have not been marked as such by system administrator.

2. Relevant releases/architectures:

Red Hat Linux 6.0 - alpha, i386, sparc, sparcv9

Red Hat Linux 6.1 - alpha, i386, sparc, sparcv9

Red Hat Linux 6.2 - alpha, i386, sparc, sparcv9

3. Problem description:

LD_PRELOAD variable is honoured normally even for SUID/SGID applications
(but removed afterwards from environment) if it does not contain `/'
characters, but there is a special check which only preloads found
libraries if they have the SUID bit set. However, if a library has been
found
in /etc/ld.so.cache, this check was not performed.  As a result, a
malicious user
could preload some /lib or /usr/lib library before SUID/SGID application
and create or overwrite a file he did not have permissions to.
Also, LD_PROFILE output from SUID programs would go into /var/tmp,
making it vulnerable to various link attacks.

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 (http://bugzilla.redhat.com/bugzilla for more info):

20832 - Unknown system type Nautilus

6. RPMs required:

Red Hat Linux 6.0:

SRPMS:
ftp://updates.redhat.com/6.0/SRPMS/glibc-2.1.3-22.src.rpm
ftp://updates.redhat.com/6.0/SRPMS/glibc-2.1.3-22.src.rpm
ftp://updates.redhat.com/6.0/SRPMS/glibc-2.1.3-22.src.rpm

alpha:
ftp://updates.redhat.com/6.0/alpha/glibc-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/glibc-devel-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/glibc-profile-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/nscd-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/nscd-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.0/alpha/nscd-2.1.3-22.alpha.rpm

i386:
ftp://updates.redhat.com/6.0/i386/glibc-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.0/i386/glibc-devel-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.0/i386/glibc-profile-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.0/i386/nscd-2.1.3-22.i386.rpm

sparc:
ftp://updates.redhat.com/6.0/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.0/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.0/sparc/glibc-devel-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.0/sparc/glibc-profile-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.0/sparc/nscd-2.1.3-22.sparc.rpm

sparcv9:
ftp://updates.redhat.com/6.0/sparcv9/glibc-2.1.3-22.sparcv9.rpm

Red Hat Linux 6.1:

SRPMS:
ftp://updates.redhat.com/6.1/SRPMS/glibc-2.1.3-22.src.rpm

alpha:
ftp://updates.redhat.com/6.1/alpha/glibc-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.1/alpha/glibc-devel-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.1/alpha/glibc-profile-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.1/alpha/nscd-2.1.3-22.alpha.rpm

i386:
ftp://updates.redhat.com/6.1/i386/glibc-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.1/i386/glibc-devel-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.1/i386/glibc-profile-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.1/i386/nscd-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.1/i386/nscd-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.1/i386/nscd-2.1.3-22.i386.rpm

sparc:
ftp://updates.redhat.com/6.1/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/glibc-devel-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/glibc-profile-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/glibc-profile-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/glibc-profile-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.1/sparc/nscd-2.1.3-22.sparc.rpm

sparcv9:
ftp://updates.redhat.com/6.1/sparcv9/glibc-2.1.3-22.sparcv9.rpm

Red Hat Linux 6.2:

SRPMS:
ftp://updates.redhat.com/6.2/SRPMS/glibc-2.1.3-22.src.rpm

alpha:
ftp://updates.redhat.com/6.2/alpha/glibc-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/glibc-devel-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/glibc-profile-2.1.3-22.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/nscd-2.1.3-22.alpha.rpm

i386:
ftp://updates.redhat.com/6.2/i386/glibc-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.2/i386/glibc-devel-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.2/i386/glibc-profile-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.2/i386/nscd-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.2/i386/nscd-2.1.3-22.i386.rpm
ftp://updates.redhat.com/6.2/i386/nscd-2.1.3-22.i386.rpm

sparc:
ftp://updates.redhat.com/6.2/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-devel-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-devel-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-devel-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/glibc-profile-2.1.3-22.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/nscd-2.1.3-22.sparc.rpm

sparcv9:
ftp://updates.redhat.com/6.2/sparcv9/glibc-2.1.3-22.sparcv9.rpm



7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
ef78f44366467486a0dac8794bc17ab9  6.2/SRPMS/glibc-2.1.3-22.src.rpm
b860e2f939f4e6517f4672361d746b38  6.2/i386/nscd-2.1.3-22.i386.rpm
e9b9b581fa4eda1a9aa2a5de8b267889  6.2/i386/glibc-profile-2.1.3-22.i386.rpm
2a779a3f6c3b87059cf40686f55dc2f6  6.2/i386/glibc-devel-2.1.3-22.i386.rpm
b841df797bf42585476f30b1ba489e30  6.2/i386/glibc-2.1.3-22.i386.rpm
e768b72385324280d62b271895261021  6.2/alpha/nscd-2.1.3-22.alpha.rpm
57040728348767ef4475ab82091a3db0  6.2/alpha/glibc-profile-2.1.3-22.alpha.rpm
e5a7cf85e50c599a51e7b9ee7d1bc78d  6.2/alpha/glibc-devel-2.1.3-22.alpha.rpm
c1edf134c6d5790ce74d7c4272ec8687  6.2/alpha/glibc-2.1.3-22.alpha.rpm
1de8f29192f62e1cc33f76d920e20a1a  6.2/sparcv9/glibc-2.1.3-22.sparcv9.rpm
966d69ca5182a97315e1f7bf5a5b7c30  6.2/sparc/nscd-2.1.3-22.sparc.rpm
a611d30013f4f98576aebb58b906c6db  6.2/sparc/glibc-profile-2.1.3-22.sparc.rpm
a305bcbf7e6f273c0c9759b622b04509  6.2/sparc/glibc-devel-2.1.3-22.sparc.rpm
74ae10e642a463b053ef531048410330  6.2/sparc/glibc-2.1.3-22.sparc.rpm
ef78f44366467486a0dac8794bc17ab9  6.1/SRPMS/glibc-2.1.3-22.src.rpm
e768b72385324280d62b271895261021  6.1/alpha/nscd-2.1.3-22.alpha.rpm
57040728348767ef4475ab82091a3db0  6.1/alpha/glibc-profile-2.1.3-22.alpha.rpm
e5a7cf85e50c599a51e7b9ee7d1bc78d  6.1/alpha/glibc-devel-2.1.3-22.alpha.rpm
c1edf134c6d5790ce74d7c4272ec8687  6.1/alpha/glibc-2.1.3-22.alpha.rpm
1de8f29192f62e1cc33f76d920e20a1a  6.1/sparcv9/glibc-2.1.3-22.sparcv9.rpm
966d69ca5182a97315e1f7bf5a5b7c30  6.1/sparc/nscd-2.1.3-22.sparc.rpm
a611d30013f4f98576aebb58b906c6db  6.1/sparc/glibc-profile-2.1.3-22.sparc.rpm
a305bcbf7e6f273c0c9759b622b04509  6.1/sparc/glibc-devel-2.1.3-22.sparc.rpm
74ae10e642a463b053ef531048410330  6.1/sparc/glibc-2.1.3-22.sparc.rpm
b860e2f939f4e6517f4672361d746b38  6.1/i386/nscd-2.1.3-22.i386.rpm
e9b9b581fa4eda1a9aa2a5de8b267889  6.1/i386/glibc-profile-2.1.3-22.i386.rpm
2a779a3f6c3b87059cf40686f55dc2f6  6.1/i386/glibc-devel-2.1.3-22.i386.rpm
b841df797bf42585476f30b1ba489e30  6.1/i386/glibc-2.1.3-22.i386.rpm
ef78f44366467486a0dac8794bc17ab9  6.0/SRPMS/glibc-2.1.3-22.src.rpm
1de8f29192f62e1cc33f76d920e20a1a  6.0/sparcv9/glibc-2.1.3-22.sparcv9.rpm
966d69ca5182a97315e1f7bf5a5b7c30  6.0/sparc/nscd-2.1.3-22.sparc.rpm
a611d30013f4f98576aebb58b906c6db  6.0/sparc/glibc-profile-2.1.3-22.sparc.rpm
a305bcbf7e6f273c0c9759b622b04509  6.0/sparc/glibc-devel-2.1.3-22.sparc.rpm
74ae10e642a463b053ef531048410330  6.0/sparc/glibc-2.1.3-22.sparc.rpm
b860e2f939f4e6517f4672361d746b38  6.0/i386/nscd-2.1.3-22.i386.rpm
e9b9b581fa4eda1a9aa2a5de8b267889  6.0/i386/glibc-profile-2.1.3-22.i386.rpm
2a779a3f6c3b87059cf40686f55dc2f6  6.0/i386/glibc-devel-2.1.3-22.i386.rpm
b841df797bf42585476f30b1ba489e30  6.0/i386/glibc-2.1.3-22.i386.rpm
e768b72385324280d62b271895261021  6.0/alpha/nscd-2.1.3-22.alpha.rpm
57040728348767ef4475ab82091a3db0  6.0/alpha/glibc-profile-2.1.3-22.alpha.rpm
e5a7cf85e50c599a51e7b9ee7d1bc78d  6.0/alpha/glibc-devel-2.1.3-22.alpha.rpm
c1edf134c6d5790ce74d7c4272ec8687  6.0/alpha/glibc-2.1.3-22.alpha.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:




Copyright(c) 2000, 2001 Red Hat, Inc.



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