1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2017, CISOfy
#
# Website : https://cisofy.com
# Blog : http://linux-audit.com
# GitHub : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# Software: PHP
#
#################################################################################
#
InsertSection "PHP"
# Possible locations of php.ini
PHPINILOCS="/etc/php.ini /etc/php.ini.default \
/etc/php/cgi-php5/php.ini /etc/php/cli-php5/php.ini /etc/php/apache2-php5/php.ini \
/etc/php/apache2-php5.4/php.ini /etc/php/apache2-php5.5/php.ini /etc/php/apache2-php5.6/php.ini \
/etc/php5/cgi/php.ini \
/etc/php5/cli/php.ini \
/etc/php5/cli-php5.4/php.ini /etc/php5/cli-php5.5/php.ini /etc/php5/cli-php5.6/php.ini \
/etc/php5/apache2/php.ini \
/etc/php5/fpm/php.ini \
/private/etc/php.ini \
/var/www/conf/php.ini \
/usr/local/etc/php.ini /usr/local/lib/php.ini \
/usr/pkg/etc/php.ini"
PHPINIDIRS="/etc/php5/conf.d \
/etc/php.d"
PHPVERSION=""
#
#################################################################################
#
# Test : PHP-2211
# Description : Check php.ini presence
Register --test-no PHP-2211 --weight L --network NO --category security --description "Check php.ini presence"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking for presence php.ini"
PHPINIFILE=""
PHPINI_ALLFILES=""
for FILE in ${PHPINILOCS}; do
LogText "Test: checking presence ${FILE}"
if [ -f ${FILE} ]; then
PHPINIFILE="${FILE}"
LogText "Result: Found php.ini file (${PHPINIFILE})"
LogText "Note: Adding file to php.ini array"
PHPINI_ALLFILES="${PHPINI_ALLFILES} ${PHPINIFILE}"
else
LogText "Result: file ${FILE} not found"
fi
done
# Check all known locations
for DIR in ${PHPINIDIRS}; do
FIND=$(ls ${DIR}/*.ini 2> /dev/null)
if [ -z "${FIND}" ]; then
LogText "Result: no files found for ${DIR}"
else
LogText "Result: found files in location ${DIR}, checking"
for FILE in ${FIND}; do
if [ -f ${FILE} ]; then
LogText "Result: file ${FILE} exists, adding to php.ini array"
PHPINI_ALLFILES="${PHPINI_ALLFILES} ${FILE}"
fi
done
fi
done
if [ ! -z "${PHPINIFILE}" ]; then
Display --indent 2 --text "- Checking PHP" --result "${STATUS_FOUND}" --color GREEN
LogText "Result: using single file ${PHPINIFILE} for main php.ini tests"
LogText "Result: using php.ini array ${PHPINI_ALLFILES} for further tests"
else
Display --indent 2 --text "- Checking PHP" --result "${STATUS_NOT_FOUND}" --color WHITE
LogText "Result: no php.ini file found"
fi
unset DIR; unset FILE; unset FIND
fi
#
#################################################################################
#
# Test : PHP-2320
# Description : Check php disable functions option
if [ ! -z "${PHPINI_ALLFILES}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no PHP-2320 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP disabled functions"
if [ ${SKIPTEST} -eq 0 ]; then
FOUND=0
for I in ${PHPINI_ALLFILES}; do
LogText "Test: Checking for PHP function hardening disabled_functions or suhosin.executor.func.blacklist in file ${I}"
FIND=$(${GREPBINARY} "^disable_functions.*=" ${I})
if [ -z "${FIND}" ]; then
LogText "Result: ${I}: disabled_functions not found"
else
LogText "Result: ${I}: found disabled_functions"
FOUND=1
fi
FIND=$(${GREPBINARY} "^suhosin.executor.func.blacklist=" ${I})
if [ -z "${FIND}" ]; then
LogText "Result: ${I}: suhosin.executor.func.blacklist not found"
else
LogText "Result: ${I}: found suhosin.executor.func.blacklist"
FOUND=1
fi
done
if [ ${FOUND} -eq 0 ]; then
LogText "Result: all PHP functions can be executed"
Display --indent 4 --text "- Checking PHP disabled functions" --result "${STATUS_NONE}" --color YELLOW
ReportSuggestion ${TEST_NO} "Harden PHP by disabling risky functions"
LogText "Functions of interest to research/disable: chown, diskfreespace, disk_free_space, disk_total_space, dl, exec, escapeshellarg, escapeshellcmd, fileinode, highlight_file, max_execution_time, passthru, pclose, phpinfo, popen, proc_close, proc_open, proc_get_status, proc_nice, proc_open, proc_terminate, set_time_limit, shell_exec, show_source, system)"
AddHP 0 1
else
LogText "Result: one or more PHP functions are disabled/blacklisted"
Display --indent 4 --text "- Checking PHP disabled functions" --result "${STATUS_FOUND}" --color GREEN
AddHP 3 3
fi
fi
#
#################################################################################
#
# Test : PHP-2368
# Description : Check php register_globals option
# Notes : Don't test for it if PHP version is 5.4.0 or later (it has been removed)
if [ ! -z "${PHPINIFILE}" -a ! -z "${PHPVERSION}" -a ! -z "${EGREPBINARY}" ]; then
if [ -f "${PHPINIFILE}" ]; then
FIND=$(echo ${PHPVERSION} | ${EGREPBINARY} "^(4.|5.[0-3])")
if [ "${FIND}" = "" ]; then
PREQS_MET="NO"; Debug "Found most likely PHP version 5.4.0 or higher (${PHPVERSION}) which does not use register_globals"
else
PREQS_MET="YES"; Debug "Found PHP version 4 or up to 5.3 (${FIND}) which we are going to scan"
fi
else
Debug "File php.ini (${PHPINIFILE}) not found"
fi
else
PREQS_MET="NO"
Debug "Skipping test: php.ini not found, or PHP version empty"
Debug "php.ini: ${PHPINIFILE}"
Debug "version: ${PHPVERSION}"
fi
Register --test-no PHP-2368 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP register_globals option"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking PHP register_globals option"
FIND=$(${EGREPBINARY} -i 'register_globals.*(on|yes|1)' ${PHPINIFILE} | ${GREPBINARY} -v '^;')
if [ ! "${FIND}" = "" ]; then
Display --indent 4 --text "- Checking register_globals option" --result "${STATUS_WARNING}" --color RED
ReportWarning ${TEST_NO} "PHP option register_globals option is turned on, which can be a risk for variable value overwriting"
ReportSuggestion ${TEST_NO} "Change the register_globals line to: register_globals = Off"
LogText "Result: register_globals option is turned on, which can be a risk for variable value overwriting."
AddHP 1 2
else
Display --indent 4 --text "- Checking register_globals option" --result "${STATUS_OK}" --color GREEN
LogText "Result: No 'register_globals' found. Most likely it is in disabled state (0, no, or off), which is the default nowadays and considered the safe value."
ReportManual ${TEST_NO}:01
AddHP 2 2
fi
fi
#
#################################################################################
#
# Test : PHP-2372
# Description : Check php expose_php option
# Notes : Extend test to check all PHP files YYY
if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no PHP-2372 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP expose_php option"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking expose_php option"
FIND=$(${EGREPBINARY} -i 'expose_php.*(off|no|0)' ${PHPINIFILE} | ${GREPBINARY} -v '^;')
if [ -z "${FIND}" ]; then
Display --indent 4 --text "- Checking expose_php option" --result "${STATUS_ON}" --color RED
ReportWarning ${TEST_NO} "PHP option expose_php is possibly turned on, which can reveal useful information for attackers."
ReportSuggestion ${TEST_NO} "Change the expose_php line to: expose_php = Off"
Report "Result: expose_php option is turned on, which can expose useful information for an attacker"
AddHP 1 2
else
Display --indent 4 --text "- Checking expose_php option" --result "${STATUS_OFF}" --color GREEN
LogText "Result: Found 'expose_php' in disabled state (0, no, or off)"
AddHP 2 2
fi
# TODO Check through all files
fi
#
#################################################################################
#
# Test : PHP-2374
# Description : Check PHP enable_dl option
# Notes : Extend test to check all PHP files
if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no PHP-2374 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP enable_dl option"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking PHP enable_dl option"
FIND=$(${EGREPBINARY} -i 'enable_dl.*(on|yes|1)' ${PHPINIFILE} | ${GREPBINARY} -v '^;')
if [ ! -z "${FIND}" ]; then
Display --indent 4 --text "- Checking enable_dl option" --result "${STATUS_ON}" --color YELLOW
Report "Result: enable_dl option is turned on, which can be used to enable more modules dynamically and circumventing security controls"
ReportSuggestion ${TEST_NO} "Change the enable_dl line to: enable_dl = Off, to disable dynamically loading new modules"
AddHP 0 1
else
Display --indent 4 --text "- Checking enable_dl option" --result "${STATUS_OFF}" --color GREEN
LogText "Result: Found 'enable_dl' in disabled state (not present, 0, no, or off)"
AddHP 2 2
fi
fi
#
#################################################################################
#
# Test : PHP-2376
# Description : Check PHP allow_url_fopen option
# Notes : Extend test to check all PHP files YYY
if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no PHP-2376 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP allow_url_fopen option"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking PHP allow_url_fopen option"
FIND=$(${EGREPBINARY} -i 'allow_url_fopen.*(off|no|0)' ${PHPINIFILE} | ${GREPBINARY} -v '^;')
if [ -z "${FIND}" ]; then
Display --indent 4 --text "- Checking allow_url_fopen option" --result "${STATUS_ON}" --color YELLOW
LogText "Result: allow_url_fopen option is turned on, which can be used for riskful downloads via PHP"
ReportSuggestion ${TEST_NO} "Change the allow_url_fopen line to: allow_url_fopen = Off, to disable downloads via PHP"
AddHP 0 1
else
Display --indent 4 --text "- Checking allow_url_fopen option" --result "${STATUS_OFF}" --color GREEN
LogText "Result: Found 'allow_url_fopen' in disabled state (0, no, or off)"
AddHP 2 2
fi
# TODO Check through all files
fi
#
#################################################################################
#
# Test : PHP-2378
# Description : Check PHP allow_url_include option
# Notes : Extend test to check all PHP files YYY
if [ ! -z "${PHPINIFILE}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no PHP-2378 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check PHP allow_url_include option"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking PHP allow_url_include option"
FIND=$(${EGREPBINARY} -i 'allow_url_include.*(off|no|0)' ${PHPINIFILE} | ${GREPBINARY} -v '^;')
if [ -z "${FIND}" ]; then
Display --indent 4 --text "- Checking allow_url_include option" --result "${STATUS_ON}" --color YELLOW
Report "Result: allow_url_include option is turned on, which can be used for riskful downloads via PHP"
ReportSuggestion ${TEST_NO} "Change the allow_url_include line to: allow_url_include = Off, to disable downloads via PHP"
AddHP 0 1
else
Display --indent 4 --text "- Checking allow_url_include option" --result "${STATUS_OFF}" --color GREEN
LogText "Result: Found 'allow_url_include' in disabled state (0, no, or off)"
AddHP 2 2
fi
fi
#
#################################################################################
#
WaitForKeyPress
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|
