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____________________________________________________________________________________________
_

                     Turbolinux Security Announcement

        Package:  kernel
        Vulnerable Packages: All Turbolinux versions previous to 2.2.18-2
        Date: 05/18/2001 5:00 PDT


        Affected Turbolinux platforms: TL 6.5 Server,
				       TL 6.1 Workstation,
                                       All Turbolinux versions
                                       6.0.5 and earlier

        Turbolinux Advisory ID#:  TLSA2001019

        Credits: Thanks go to Chris Evans and OpenWall

        References:  http://www.linux.org.uk/VERSION/relnotes.2219.html
                     http://www.securityportal.com/topnews/weekly/linux.html 


____________________________________________________________________________________________
_

Several security holes have been discovered and fixed in the kernel
packages.  Please update the packages in your installation as soon as
possible.
____________________________________________________________________________________________
_

1. Problem Summary

   a. Ptrace/execve race condition
	
	An attacker can manipulate a setuid process that uses ptrace,
      thereby allowing root access. This problem was thought to have
      been fixed in a previous kernel patch, but apparently it was not.

   b. Sysctl() Kernel Information Leakage Vulnerability

      From the Securityfocus.com advisory, #2364:

	The sysctl() call allows a privileged program to read or write
      kernel parameters.  However, underprivileged programs can utilize
      this function call because the call will accept signed values.  Hence,
      it is possible for an attacker to reach below the threshold memory
      address set for system security by supplying negative values.  This
      would enable him to browse kernel information, potentially giving
      him administrative access.

   c. binfmt_misc 
      
	binfmt_misc touched user pages directly and could be exploited. 

   d. CPIA driver 
      	
	An off by one buffer check in the CPIA driver allowed users to
      scribble into kernel memory 
 
   e. CPUID and MSR drivers 
     	
	Unloading and reloading these could cause a crash due to missing
      unregister calls. Normally not exploitable but if set to autoload
      and unload they could be abused. 

   f. Classifier 
     
        Fix a possible hang in the classifier code. 

   g. get/setsockopt 
     
	Mishandling of sign bits in setsockopt and getsockopt allowed
      local DoS and other attacks. 

   h. SYS5 shared memory 
     
	A code path existed where the shm code would scribble on very
      recently freed memory. It is not clear that this was actually
      exploitable. 

   i. User access asm bug on x86 
     
	Certain obscure constant copies came out copying the wrong number
      of bytes. No known exploit or actual problem case is known but it
      potentially existed. 

   j. UDP Deadlock 
     
	A local user could deadlock the kernel due to bugs in UDP port
      allocation.


2. Solution

  Update each package from our ftp server by running the following
  command:

  rpm -Uvh ftp_path_to_filename

  Where ftp_path_to_filename is the following:
  
  Note:  Please update the packages in the order listed below:


kernel-BOOT-2.2.18-10.3.i386.rpm
kernel-doc-2.2.18-10.3.i386.rpm 
kernel-extramodules-2.2.18-10.i386.rpm
kernel-utils-2.2.18-10.3.i386.rpm
kernel-headers-2.2.18-10.3.i386.rpm
kernel-ibcs-2.2.18-10.3.i386.rpm
kernel-pcmcia-cs-2.2.18-10.3.i386.rpm
kernel-source-2.2.18-10.3.i386.rpm
kernel-smp-2.2.18-10.3.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/kernel-2.2.18-10.3.i386.rpm
  

  The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/kernel-2.2.18-10.3.src.rpm

  **Note: You must rebuild and install the RPM if you choose to download
  and install the SRPM.  Simply installing the SRPM alone WILL NOT CLOSE
  THE SECURITY HOLE.

 Please verify the MD5 checksums of the updates before you install:

  MD5 sum                               Package Name
--------------------------------------------------------------------------------------------
-
                                       
  5b4a4c2ac06a2479a562fca01991fe74	kernel-2.2.18-10.3.i386.rpm
  22bc47854607e0d5e04080898178d2e3	kernel-BOOT-2.2.18-10.3.i386.rpm
  fe8900046323a73436ec82adb85e2b1a	kernel-doc-2.2.18-10.3.i386.rpm
  c8acccc7e3c041fb3322be5b92612889      kernel-extramodules-2.2.18-10.i386.rpm
  f74efedbf5617a03182431e0156abf66      kernel-headers-2.2.18-10.3.i386.rpm
  963d95342008f22f1d2c9047f295e567	kernel-ibcs-2.2.18-10.3.i386.rpm
  41e25d4268cf638fbef50df525b117d1      kernel-pcmcia-cs-2.2.18-10.3.i386.rpm
  218fe6840a9f6fe068d771bf638f87a2	kernel-smp-2.2.18-10.3.i386.rpm
  ae393a256d96ba4ae073952ac23e2e23	kernel-source-2.2.18-10.3.i386.rpm
  4b316041c196f7dfc35a7153e16cad2f	kernel-utils-2.2.18-10.3.i386.rpm
  e6c0d9d0fe7d8372f78c70a265f8f1c9	kernel-2.2.18-10.3.src.rpm

____________________________________________________________________________________________
_

These packages are GPG signed by Turbolinux for security. Our key
is available here:

 http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

 rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

 md5sum name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.

_______________________________________________________________________________________________
_

You can find more updates on our ftp server:

   ftp://ftp.turbolinux.com/pub/updates/6.0/security/ 
   
   for TL6.x Workstation and Server security updates

Our webpage for security announcements:

   http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

   security@turbolinux.com
_______________________________________________________________________________________________
_

Subscribe to the Turbolinux Security Mailing lists:

  TL-security - A moderated list for discussing security issues
                Turbolinux products.
  Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

  TL-security-announce - An announce-only mailing list for security
                         updates and alerts.

  Subscribe at:

      http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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