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crp (/usr/apollo/bin/crp)
Systems Affected:HP/Apollo Domain/OS SR10 systems up through SR10.3
Problem: There is a security problem with the /usr/apollo/bin/crp facility. A user who is not running crp is not vulnerable to this problem.

A person at a remote or local site can obtain the privileges of the user who is running crp.

Solution: The suggested workaround is to disable two system calls that are made by /usr/apollo/bin/crp. The following steps should be executed by root or another appropriate userid that has the privilege to write in the directories involved. 
        extern void pad_$dm_cmd(void);
        void pad_$dm_cmd() { }
        extern void pad_$def_pfk(void);
        void pad_$def_pfk() { }
2. Compile this program using '-pic': 
        (AEGIS)  /com/cc crplib.c -pic
        (UNIX)   /bin/cc -c crplib.c -W0,-pic
3. Copy the result to somewhere accessible to all users (/lib/crplib is recommended). 
        (AEGIS)  /com/cpf crplib.bin /lib/crplib
        (AEGIS)  /com/edacl -p root prwx -g wheel rx -w rx /lib/crplib

        (UNIX)   /bin/cp crplib.o /lib/crplib
        (UNIX)   /bin/chmod 755 /lib/crplib
4. a) Ensure that all users do an 'inlib' of that file before running crp. One way to ensure this would be to replace the /usr/apollo/bin/crp command by a shell script that does the inlib. Doing this step will force crp to use the null functions defined in step 1 above. 
        (AEGIS)  /com/chn /usr/apollo/bin/crp crp.orig
        (UNIX)   /bin/mv /usr/apollo/bin/crp /usr/apollo/bin/crp.orig
b) Create the file /usr/apollo/bin/crp containing the shell script: 
        (AEGIS) #!/com/sh
                /com/sh -c inlib /lib/crplib ';' /usr/apollo/bin/crp.orig ^*

        (UNIX)  #!/bin/sh
                inlib /lib/crplib
                exec /usr/apollo/bin/crp.orig "$@"
c) Make this script executable. 
        (AEGIS) /com/edacl -p root prwx -g wheel rx -w rx /usr/apollo/bin/crp
        (UNIX)  /bin/chmod 755 /usr/apollo/bin/crp
NOTE: This workaround will prevent crp from making use of the two system calls; and therefore, it may affect the functionality of various software programs since they will be unable to define programmable function keys, create new windows on the client node, or execute background processes using the Display Manager interface.

Patches that address this problem will be available in the SR10.3 patch tape (~Feb 92) and in the SR10.4 software release. Contact your local sales office for more information.


Aleph One / aleph1@underground.org
Copyright © 1996 Computer Underground Society. All rights reserved.