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                   Red Hat Security Advisory

Synopsis:          Updated 2.4 kernel fixes vulnerabilities
Advisory ID:       RHSA-2003:238-01
Issue date:        2003-07-21
Updated on:        2003-07-21
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         RHSA-2003:098 RHBA-2003:135 RHSA-2003:172 RHSA-2003:187
CVE Names:         CAN-2003-0461 CAN-2003-0462 CAN-2003-0476 CAN-2003-0501 CAN-2003-0550 CAN-2003-0551 CAN-2003-0552
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1. Topic:

Updated kernel packages are now available fixing several security
vulnerabilities.

2. Relevant releases/architectures:

Red Hat Linux 7.1 - athlon, i386, i586, i686
Red Hat Linux 7.2 - athlon, i386, i586, i686
Red Hat Linux 7.3 - athlon, i386, i586, i686
Red Hat Linux 8.0 - athlon, i386, i586, i686
Red Hat Linux 9 - athlon, i386, i586, i686

3. Problem description:

The Linux kernel handles the basic functions of the operating system.

Several security issues have been discovered affecting the Linux kernel:

CAN-2003-0461: /proc/tty/driver/serial reveals the exact character counts
for serial links.  This could be used by a local attacker to infer password
lengths and inter-keystroke timings during password entry.

CAN-2003-0462: Paul Starzetz discovered a file read race condition existing
in the execve() system call, which could cause a local crash.

CAN-2003-0464: A recent change in the RPC code set the reuse flag on
newly-created sockets.  Olaf Kirch noticed that his could allow normal
users to bind to UDP ports used for services such as nfsd.

CAN-2003-0476: The execve system call in Linux 2.4.x records the file
descriptor of the executable process in the file table of the calling
process, allowing local users to gain read access to restricted file
descriptors.  

CAN-2003-0501: The /proc filesystem in Linux allows local users to obtain
sensitive information by opening various entries in /proc/self before
executing a setuid program.  This causes the program to fail to change the
ownership and permissions of already opened entries.
 
CAN-2003-0550: The STP protocol is known to have no security, which could
allow attackers to alter the bridge topology.  STP is now turned off by
default.

CAN-2003-0551: STP input processing was lax in its length checking, which
could lead to a denial of service.

CAN-2003-0552: Jerry Kreuscher discovered that the Forwarding table could
be spoofed by sending forged packets with bogus source addresses the same
as the local host.  

All users are advised to upgrade to these errata packages, which contain
backported security patches correcting these vulnerabilities.
 

Important:

If you use Red Hat Linux 7.1, you must have installed quota-3.06-9.71 from
RHSA-2003-187, and if you use Red Hat Linux 7.2 or 7.3, you must have
installed quota-3.06-9.7 from RHSA-2003-187.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To use Red Hat Network to upgrade the kernel, launch the Red Hat Update
Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.  Note that you need to select the
kernel explicitly if you are using the default configuration of up2date.

To install kernel packages manually, use "rpm -ivh " and
modify system settings to boot the kernel you have installed.  To
do this, edit /boot/grub/grub.conf and change the default entry to
"default=0" (or, if you have chosen to use LILO as your boot loader,
edit /etc/lilo.conf and run lilo)

Do not use "rpm -Uvh" as that will remove your running kernel binaries
from your system.  You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

5. RPMs required:

Red Hat Linux 7.1:

SRPMS: 
 

athlon: 
  
 

i386: 
  
  
  
 

i586: 
  
 

i686: 
  
  
 

Red Hat Linux 7.2:

SRPMS: 
 

athlon: 
  
 

i386: 
  
  
  
 

i586: 
  
 

i686: 
  
  
 

Red Hat Linux 7.3:

SRPMS: 
 

athlon: 
  
 

i386: 
  
  
  
 

i586: 
  
 

i686: 
  
  
 

Red Hat Linux 8.0:

SRPMS: 
 

athlon: 
  
 

i386: 
  
  
  
 

i586: 
  
 

i686: 
  
  
 

Red Hat Linux 9:

SRPMS: 
 

athlon: 
  
 

i386: 
  
  
  
 

i586: 
  
 

i686: 
  
  
 



6. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------
698d00bb8d014e20e717b554aa582bf5 7.1/en/os/SRPMS/kernel-2.4.20-19.7.src.rpm
41a8c2599df485a6299bcde0a25ae284 7.1/en/os/athlon/kernel-2.4.20-19.7.athlon.rpm
dc872a77835fc0fd81d54905ba979183 7.1/en/os/athlon/kernel-smp-2.4.20-19.7.athlon.rpm
41e4f2992c6beaf0a4d3fdbb631c5e9d 7.1/en/os/i386/kernel-2.4.20-19.7.i386.rpm
64894543c12748599d6abb945d0c03c9 7.1/en/os/i386/kernel-BOOT-2.4.20-19.7.i386.rpm
02634a9fdecc9a9b8c028187b9c0dccc 7.1/en/os/i386/kernel-doc-2.4.20-19.7.i386.rpm
537f69c51f85b04130082d06a6497946 7.1/en/os/i386/kernel-source-2.4.20-19.7.i386.rpm
7e6672a3758853a9fe482dd1840b570c 7.1/en/os/i586/kernel-2.4.20-19.7.i586.rpm
a17f6e2e1ec4cd10fa34377092bfb075 7.1/en/os/i586/kernel-smp-2.4.20-19.7.i586.rpm
a7a968d159074b0d7d9bf570e0d4453b 7.1/en/os/i686/kernel-2.4.20-19.7.i686.rpm
50e7098370f3184b9f8170883a63af4c 7.1/en/os/i686/kernel-bigmem-2.4.20-19.7.i686.rpm
5e28ba6b0d2e8562f572de0b0724eeb7 7.1/en/os/i686/kernel-smp-2.4.20-19.7.i686.rpm
698d00bb8d014e20e717b554aa582bf5 7.2/en/os/SRPMS/kernel-2.4.20-19.7.src.rpm
41a8c2599df485a6299bcde0a25ae284 7.2/en/os/athlon/kernel-2.4.20-19.7.athlon.rpm
dc872a77835fc0fd81d54905ba979183 7.2/en/os/athlon/kernel-smp-2.4.20-19.7.athlon.rpm
41e4f2992c6beaf0a4d3fdbb631c5e9d 7.2/en/os/i386/kernel-2.4.20-19.7.i386.rpm
64894543c12748599d6abb945d0c03c9 7.2/en/os/i386/kernel-BOOT-2.4.20-19.7.i386.rpm
02634a9fdecc9a9b8c028187b9c0dccc 7.2/en/os/i386/kernel-doc-2.4.20-19.7.i386.rpm
537f69c51f85b04130082d06a6497946 7.2/en/os/i386/kernel-source-2.4.20-19.7.i386.rpm
7e6672a3758853a9fe482dd1840b570c 7.2/en/os/i586/kernel-2.4.20-19.7.i586.rpm
a17f6e2e1ec4cd10fa34377092bfb075 7.2/en/os/i586/kernel-smp-2.4.20-19.7.i586.rpm
a7a968d159074b0d7d9bf570e0d4453b 7.2/en/os/i686/kernel-2.4.20-19.7.i686.rpm
50e7098370f3184b9f8170883a63af4c 7.2/en/os/i686/kernel-bigmem-2.4.20-19.7.i686.rpm
5e28ba6b0d2e8562f572de0b0724eeb7 7.2/en/os/i686/kernel-smp-2.4.20-19.7.i686.rpm
698d00bb8d014e20e717b554aa582bf5 7.3/en/os/SRPMS/kernel-2.4.20-19.7.src.rpm
41a8c2599df485a6299bcde0a25ae284 7.3/en/os/athlon/kernel-2.4.20-19.7.athlon.rpm
dc872a77835fc0fd81d54905ba979183 7.3/en/os/athlon/kernel-smp-2.4.20-19.7.athlon.rpm
41e4f2992c6beaf0a4d3fdbb631c5e9d 7.3/en/os/i386/kernel-2.4.20-19.7.i386.rpm
64894543c12748599d6abb945d0c03c9 7.3/en/os/i386/kernel-BOOT-2.4.20-19.7.i386.rpm
02634a9fdecc9a9b8c028187b9c0dccc 7.3/en/os/i386/kernel-doc-2.4.20-19.7.i386.rpm
537f69c51f85b04130082d06a6497946 7.3/en/os/i386/kernel-source-2.4.20-19.7.i386.rpm
7e6672a3758853a9fe482dd1840b570c 7.3/en/os/i586/kernel-2.4.20-19.7.i586.rpm
a17f6e2e1ec4cd10fa34377092bfb075 7.3/en/os/i586/kernel-smp-2.4.20-19.7.i586.rpm
a7a968d159074b0d7d9bf570e0d4453b 7.3/en/os/i686/kernel-2.4.20-19.7.i686.rpm
50e7098370f3184b9f8170883a63af4c 7.3/en/os/i686/kernel-bigmem-2.4.20-19.7.i686.rpm
5e28ba6b0d2e8562f572de0b0724eeb7 7.3/en/os/i686/kernel-smp-2.4.20-19.7.i686.rpm
cf43c708a8c9b92a273aad9782ebe3fc 8.0/en/os/SRPMS/kernel-2.4.20-19.8.src.rpm
8fc7f90b8e8d557c41d6cf2547952c1d 8.0/en/os/athlon/kernel-2.4.20-19.8.athlon.rpm
52b18ab6ae28422e518642517644da35 8.0/en/os/athlon/kernel-smp-2.4.20-19.8.athlon.rpm
fbfff1b36f17e26e6a1ce479ef49e365 8.0/en/os/i386/kernel-2.4.20-19.8.i386.rpm
4d8350dd66be36060bf0551f36a9eb6f 8.0/en/os/i386/kernel-BOOT-2.4.20-19.8.i386.rpm
af87de700f6b2568e6b7d5ed4ef75df1 8.0/en/os/i386/kernel-doc-2.4.20-19.8.i386.rpm
b5e079c96b00226951564afcc2d4d5af 8.0/en/os/i386/kernel-source-2.4.20-19.8.i386.rpm
8cc317a6f56dbdc0c1464a7e96ee37b8 8.0/en/os/i586/kernel-2.4.20-19.8.i586.rpm
a552754aad9099019c18cdc8d5cb1f41 8.0/en/os/i586/kernel-smp-2.4.20-19.8.i586.rpm
9f0d0622b37dc199e8cb79acfc426d74 8.0/en/os/i686/kernel-2.4.20-19.8.i686.rpm
f91b6e385290e82075c2b321247f8ada 8.0/en/os/i686/kernel-bigmem-2.4.20-19.8.i686.rpm
9856cb68f2f32410ae5ffc7a9789bccb 8.0/en/os/i686/kernel-smp-2.4.20-19.8.i686.rpm
6ca9ea03ece1c3a40d0c1acb5bb5d2f2 9/en/os/SRPMS/kernel-2.4.20-19.9.src.rpm
2e1ecff32d8c91126f96032576afbe7b 9/en/os/athlon/kernel-2.4.20-19.9.athlon.rpm
a22c6fc30dc64d1394361f93890fc23e 9/en/os/athlon/kernel-smp-2.4.20-19.9.athlon.rpm
030ed2ec0324b58a1e80e8c7ee54effe 9/en/os/i386/kernel-2.4.20-19.9.i386.rpm
f97f319353b32eeb2f96a0311135c856 9/en/os/i386/kernel-BOOT-2.4.20-19.9.i386.rpm
d31fe42a6b1269362dd70ee361bdc94d 9/en/os/i386/kernel-doc-2.4.20-19.9.i386.rpm
0daf50da25ade8cce42e7445dfe0d24c 9/en/os/i386/kernel-source-2.4.20-19.9.i386.rpm
bd471aa92a83aa40c6fc4ee06e5f2f0e 9/en/os/i586/kernel-2.4.20-19.9.i586.rpm
cafec48037739216070833def01a3832 9/en/os/i586/kernel-smp-2.4.20-19.9.i586.rpm
e940c18ed58ca525ba0545be23ce43b4 9/en/os/i686/kernel-2.4.20-19.9.i686.rpm
b2216f3ac6697ca319ed8547a1edb320 9/en/os/i686/kernel-bigmem-2.4.20-19.9.i686.rpm
bb8b49b539bf16b8bce329d80dfafaca 9/en/os/i686/kernel-smp-2.4.20-19.9.i686.rpm


These packages are GPG signed by Red Hat for security.  Our key is
available from  Product Signing Keys - Red Hat Customer Portal

You can verify each package with the following command:
    
    rpm --checksig -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum 


7. References:
 
CVE -CVE-2003-0461 
CVE -CVE-2003-0462 
CVE -CVE-2003-0476 
CVE -CVE-2003-0501 
CVE -CVE-2003-0550 
CVE -CVE-2003-0551 
CVE -CVE-2003-0552

8. Contact:

The Red Hat security contact is <secalert@RedHat.com>.  More contact
details at  All Red Hat products

Copyright 2003 Red Hat, Inc.