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README.md

checksec

Checksec.sh is a bash scrip to check executable properties like (PIE, RELRO, PaX, Canaries, ASLR). It has been originally written by Tobias Klein and available here: http://www.trapkit.de/tools/checksec.html

Enhancement

The main issue dealing with the original checksec version is the cli interface which can only be exploited by a human. That is the reason why I have modified the script to take various other kind of outputs like CSV and XML. By this way the output of this script can easily be reused by any other programs.

Examples

normal (or --format cli)

$checksec.sh --file /bin/ls
RELRO           STACK CANARY      NX            PIE             RPATH      RUNPATH      FILE
Partial RELRO   Canary found      NX enabled    No PIE          No RPATH   No RUNPATH   /bin/ls

csv

$ checksec.sh --format csv --file /bin/ls
Partial RELRO,Canary found,NX enabled,No PIE,No RPATH,No RUNPATH,/bin/ls

xml

$ checksec.sh --format xml --file /bin/ls
<file relro="partial" canary="yes" nx="yes" pie="no" rpath="no" runpath="no" filename='/bin/ls'/>

Fortify test in cli

$ checksec.sh --fortify-proc 1
* Process name (PID)                         : init (1)
* FORTIFY_SOURCE support available (libc)    : Yes
* Binary compiled with FORTIFY_SOURCE support: Yes

------ EXECUTABLE-FILE ------- . -------- LIBC --------
FORTIFY-able library functions | Checked function names
-------------------------------------------------------
fdelt_chk                      | __fdelt_chk
read                           | __read_chk
syslog_chk                     | __syslog_chk
fprintf_chk                    | __fprintf_chk
vsnprintf_chk                  | __vsnprintf_chk
fgets                          | __fgets_chk
strncpy                        | __strncpy_chk
snprintf_chk                   | __snprintf_chk
memset                         | __memset_chk
strncat_chk                    | __strncat_chk
memcpy                         | __memcpy_chk
fread                          | __fread_chk
sprintf_chk                    | __sprintf_chk

SUMMARY:

* Number of checked functions in libc                : 78
* Total number of library functions in the executable: 116
* Number of FORTIFY-able functions in the executable : 13
* Number of checked functions in the executable      : 7
* Number of unchecked functions in the executable    : 6

Fortify test in csv

$ checksec.sh --format csv --fortify-proc 1
Yes,Yes
fdelt_chk,fdelt,no
read,read,yes
syslog_chk,syslog,no
fprintf_chk,fprintf,no
vsnprintf_chk,vsnprintf,no
fgets,fgets,yes
strncpy,strncpy,yes
snprintf_chk,snprintf,no
memset,memset,yes
strncat_chk,strncat,no
memcpy,memcpy,yes
fread,fread,yes
sprintf_chk,sprintf,no
78,116,13,13,6

Fortify test in xml

$ checksec.sh --format xml --fortify-proc 1
<fortify-test name='init' pid='1'  libc_fortify_source='yes' binary_compiled_with_fortify='yes'>
<function name='fdelt_chk' libc='fdelt' fortifyable='no' />
<function name='read' libc='read' fortifyable='yes' />
<function name='syslog_chk' libc='syslog' fortifyable='no' />
<function name='fprintf_chk' libc='fprintf' fortifyable='no' />
<function name='vsnprintf_chk' libc='vsnprintf' fortifyable='no' />
<function name='fgets' libc='fgets' fortifyable='yes' />
<function name='strncpy' libc='strncpy' fortifyable='yes' />
<function name='snprintf_chk' libc='snprintf' fortifyable='no' />
<function name='memset' libc='memset' fortifyable='yes' />
<function name='strncat_chk' libc='strncat' fortifyable='no' />
<function name='memcpy' libc='memcpy' fortifyable='yes' />
<function name='fread' libc='fread' fortifyable='yes' />
<function name='sprintf_chk' libc='sprintf' fortifyable='no' />

<stats nb_libc_func='78' nb_total_func='116' nb_fortifyable_func='13' nb_checked_func='13' nb_unchecked_func='6' />
</fortify-test>

Warning

Due to the original structure of the script the --format argument should be placed first on the command line arguments. Doing differently would have obliged me to do really big changes in the code.

About

Bash script to test executable properties like (PIE, RELRO, PaX, Canaries, ASLR). (Version derivated from the original one trapkit.de/tools/checksec.html

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