blob: e9a74ddc799f955a5ecae5a43a7f3a8dc62f6537 (
plain)
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
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
|
#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2014, Michael Boelen (michael@rootkit.nl), The Netherlands
# Web site: http://www.rootkit.nl
#
# 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.
#
#################################################################################
#
# Shells
#
#################################################################################
#
IDLE_TIMEOUT=0
InsertSection "Shells"
#
#################################################################################
#
# bash
# Files (interactive login shells): /etc/profile $HOME/.bash_profile
# $HOME/.bash_login $HOME/.profile
# Files (interactive non-login shells): $HOME/.bash_rc
# csh/tcsh
# Files: /etc/csh.cshrc /etc/csh.login
# zsh
# Files: /etc/zshenv /etc/zsh/zshenv $HOME/.zshenv /etc/zprofile
# /etc/zsh/zprofile $HOME/.zprofile /etc/zshrc /etc/zsh/zshrc
# $ZDOTDIR/.zshrc /etc/zlogin /etc/zsh/zlogin
SHELL_LOGIN_FILES="/etc/csh.cshrc /etc/csh.login /etc/zshenv /etc/zsh/zshenv
/etc/zprofile /etc/zsh/zprofile /etc/zshrc /etc/zsh/zshrc
/etc/zlogin /etc/zsh/zlogin"
#
#################################################################################
#
# Test : SHLL-6202
# Description : check all console TTYs in which root user can enter single user mode without password
Register --test-no SHLL-6202 --os FreeBSD --weight L --network NO --description "Check console TTYs"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Checking console TTYs"
FIND=`cat /etc/ttys | egrep '^console' | grep -v 'insecure'`
if [ "${FIND}" = "" ]; then
Display --indent 2 --text "- Checking console TTYs" --result OK --color GREEN
logtext "Result: console is secured against single user mode without password."
else
Display --indent 2 --text "- Checking console TTYs" --result WARNING --color RED
logtext "Result: Found insecure console in /etc/ttys. Single user mode login without password allowed!"
logtext "Output /etc/ttys:"
logtext "${FIND}"
ReportWarning ${TEST_NO} "M" "Found unprotected console in /etc/ttys"
#ReportSuggestion ${TEST_NO} "Change the console line from 'secure' to 'insecure'."
fi
fi
#
#################################################################################
#
# Test : SHLL-6214
# Description : check for idle session killing tools (timeoutd)
#
#################################################################################
#
# Test : SHLL-6211
# Description : which shells are available according /etc/shells
Register --test-no SHLL-6211 --weight L --network NO --description "Checking available and valid shells"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Searching for /etc/shells"
if [ -f /etc/shells ]; then
logtext "Result: Found /etc/shells file"
logtext "Test: Reading available shells from /etc/shells"
SSHELLS=`cat /etc/shells | grep "^/"`
CSSHELLS=0; CSSHELLS_ALL=0
Display --indent 2 --text "- Checking shells from /etc/shells"
for I in ${SSHELLS}; do
CSSHELLS_ALL=`expr ${CSSHELLS_ALL} + 1`
report "available_shell[]=${I}"
# YYY add check for symlinked shells
if [ -f ${I} ]; then
logtext "Found installed shell: ${I}"
CSSHELLS=`expr ${CSSHELLS} + 1`
else
logtext "Shell ${I} not installed. Probably a dummy or non existing shell."
fi
done
Display --indent 4 --text "Result: found ${CSSHELLS_ALL} shells (valid shells: ${CSSHELLS})."
else
logtext "Result: /etc/shells not found, skipping test"
fi
fi
#
#################################################################################
#
# Test : SHLL-6220
# Description : check for idle session killing tools or settings
Register --test-no SHLL-6220 --weight L --network NO --description "Checking available and valid shells"
if [ ${SKIPTEST} -eq 0 ]; then
logtext "Test: Search for session timeout tools or settings in shell"
IsRunning timeoutd
if [ ${RUNNING} -eq 1 ]; then
IDLE_TIMEOUT=1
logtext "Result: found timeoutd process to kill idle sesions"
report="session_timeout_method=timeout daemon"
fi
IsRunning autolog
if [ ${RUNNING} -eq 1 ]; then
IDLE_TIMEOUT=1
logtext "Result: found autolog process to kill idle sesions"
report="session_timeout_method[]=autolog"
fi
if [ -f /etc/profile ]; then
FIND=`cat /etc/profile | grep '\(export[ \t]*\)\?TMOUT=' | tr -d ' ' | tr -d '\t' | grep -v "^#" | sed 's/export//' | sed 's/#.*//'`
if [ ! "${FIND}" = "" ]; then
N=0; IDLE_TIMEOUT=1
for I in ${FIND}; do
logtext "Output: ${I}"
N=`expr ${N} + 1`
done
if [ ${N} -eq 1 ]; then
logtext "Result: found TMOUT value configured in /etc/profile"
else
logtext "Result: found several TMOUT values configured in /etc/profile"
fi
report "session_timeout_method[]=profile"
else
logtext "Result: could not find TMOUT setting in /etc/profile"
fi
else
logtext "Result: skip /etc/profile test, file not available on this system"
fi
if [ -d /etc/profile.d ]; then
FIND=`cat /etc/profile.d/*.sh 2> /dev/null | grep '\(export[ \t]*\)\?TMOUT=' | tr -d ' ' | tr -d '\t' | grep -v "^#" | sed 's/export//' | sed 's/#.*//'`
if [ ! "${FIND}" = "" ]; then
N=0; IDLE_TIMEOUT=1
for I in ${FIND}; do
logtext "Output: ${I}"
N=`expr ${N} + 1`
done
if [ ${N} -eq 1 ]; then
logtext "Result: found TMOUT value configured in one of the files in /etc/profile.d directory"
else
logtext "Result: found several TMOUT values configured in one of the files in /etc/profile.d directory"
fi
report "session_timeout_method[]=profile"
else
logtext "Result: could not find TMOUT setting in /etc/profile.d/*.sh"
fi
else
logtext "Result: skip /etc/profile.d directory test, directory not available on this system"
fi
if [ ${IDLE_TIMEOUT} -eq 1 ]; then
Display --indent 4 --text "- Session timeout settings/tools" --result "FOUND" --color GREEN
AddHP 3 3
else
Display --indent 4 --text "- Session timeout settings/tools" --result "NONE" --color YELLOW
AddHP 1 3
fi
fi
#
#################################################################################
#
# Test : SHLL-6236
# Description : Check /etc/profile
#
#################################################################################
#
# Test : SHLL-6240
# Description : Check default umask
# Register --test-no SHLL-6240 --weight L --network NO --description "Check default umask"
# if [ ${SKIPTEST} -eq 0 ]; then
# logtext "Test: Checking /etc/profile"
# if [ -f /etc/profile ]; then
# FIND=`grep "^umask" | awk '{ print $2 }'`
# if [ "${FIND}" = "" ]; then
# logtext "Result: xxx"
# Display --indent 2 --text "- Checking default umask" --result OK --color GREEN
# else
# logtext "Result: xxx"
# Display --indent 2 --text "- Checking default umask" --result WARNING --color RED
# #ReportWarning ${TEST_NO} "M" "xxx"
# #ReportSuggestion ${TEST_NO} "xxx"
# fi
# fi
# fi
#
#################################################################################
#
# Test : SHLL-6250
# Description : Check /etc/bash.bashrc
# Register --test-no SHLL-6250 --weight L --network NO --description "Check default umask"
# if [ ${SKIPTEST} -eq 0 ]; then
#
#################################################################################
#
#
#################################################################################
#
# Test : SHLL-6290
# Description : Check shellshock vulnerability
Register --test-no SHLL-6290 --weight H --network NO --description "Check shellshock vulnerability (CVE-2014-6271)"
if [ ${SKIPTEST} -eq 0 ]; then
FOUND=0
#Display --indent 2 --text "- Testing for Shellshock vulnerability"
logtext "Test: Check if bash is in the list of shells."
if [ -f /etc/shells ]; then
logtext "Test: checking for bash shell in /etc/shells"
FIND=`egrep '(/usr)?(/local)?/bin/bash' /etc/shells | grep -v "^#" | head -1`
else
logtext "Test: checking if bash is available via which command"
FIND=`which bash 2> /dev/null | head -1`
fi
logtext "Result: command revealed ${FIND} as output"
if [ ! "${FIND}" = "" -a -x ${FIND} -a ! -L ${FIND} ]; then
logtext "Result: found ${FIND} as a valid shell"
SHELLSHOCK_TMP=`mktemp /tmp/lynis-shellshock-test.XXXXXXXXXX` || exit 1
# CVE-2014-6271
logtext "Test: Check for first exploit (CVE-2014-6271)"
echo "env 'x=() { :;}; echo vulnerable' 'BASH_FUNC_x()=() { :;}; echo vulnerable' bash -c \"echo test\" 2>&1 | grep 'vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to original shellshock (CVE-2014-6271)"
Display --indent 2 --text "- Shellshock: CVE-2014-6271 (original shellshocker)" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to original shellshock (CVE-2014-6271)"
#Display --indent 4 --text "- CVE-2014-6271 (original shellshocker)" --result "OK" --color GREEN
fi
# CVE-2014-6277
logtext "Test: Check for first exploit (CVE-2014-6277)"
echo "(bash -c \"f() { x() { _;}; x() { _;} <<a; }\" 2>/dev/null || echo vulnerable) | grep 'vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to original shellshock (CVE-2014-6277)"
Display --indent 2 --text "- Shellshock: CVE-2014-6277 (segfault, lcamtuf bug #1)" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to original shellshock (CVE-2014-6277)"
#Display --indent 4 --text "- CVE-2014-6277 (segfault, lcamtuf bug #1)" --result "OK" --color GREEN
fi
# CVE-2014-6278
logtext "Test: Check for CVE-2014-6278"
echo "shellshocker='() { echo vulnerable; }' bash -c shellshocker 2>/dev/null | grep 'vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to CVE-2014-6278"
Display --indent 2 --text "- Shellshock: CVE-2014-6278 (Florian's patch, lcamtuf bug #2)" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to CVE-2014-6278"
#Display --indent 4 --text "- CVE-2014-6278 (Florian's patch, lcamtuf bug #2)" --result "OK" --color GREEN
fi
# CVE-2014-7169
logtext "Test: Check for taviso bug CVE-2014-7169"
echo "(cd /tmp; rm -f /tmp/echo; env X='() { (a)=>\' bash -c "echo echo nonvuln" 2>/dev/null; [[ \"\$(cat echo 2> /dev/null)\" == \"nonvuln\" ]] && echo \"vulnerable\" 2> /dev/null) | grep ' vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to taviso bug (CVE-2014-7169)"
Display --indent 2 --text "- Shellshock: CVE-2014-7169 (taviso bug)" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to taviso bug (CVE-2014-7169)"
#Display --indent 4 --text "- CVE-2014-7169 (taviso bug)" --result "OK" --color GREEN
fi
# CVE-2014-7186
logtext "Test: Check for CVE-2014-7186"
echo "(bash -c 'true <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF' 2>/dev/null || echo \"vulnerable\") | grep 'vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to CVE-2014-7186"
Display --indent 2 --text "- Shellshock: CVE-2014-7186 redir_stack bug" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to CVE-2014-7186"
#Display --indent 4 --text "- CVE-2014-7186 redir_stack bug" --result "OK" --color GREEN
fi
# CVE-2014-7187
logtext "Test: Check for CVE-2014-7187"
echo "((for x in {1..200}; do echo \"for x$x in ; do :\"; done; for x in {1..200}; do echo done; done) | bash || echo \"vulnerable\") | grep 'vulnerable'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to CVE-2014-7187"
Display --indent 2 --text "- Shellshock: CVE-2014-7187 nested loops off by one bug" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to CVE-2014-7187"
#Display --indent 4 --text "- CVE-2014-7187 nested loops off by one bug" --result "OK" --color GREEN
fi
# CVE-2014-////
logtext "Test: Check for bug Exploit #3 - shellshocker.net (no CVE)"
echo "env X=' () { }; echo hello' bash -c 'date'| grep 'hello'" > ${SHELLSHOCK_TMP}
VULNERABLE=`${FIND} ${SHELLSHOCK_TMP} 2> /dev/null`
rm -f ${SHELLSHOCK_TMP}
if [ ! "${VULNERABLE}" = "" ]; then
logtext "Output: ${VULNERABLE}"
logtext "Result: Vulnerable to CVE-2014-//// (exploit #3 on shellshocker.net)"
Display --indent 2 --text "- Shellshock: Exploit #3 on shellshocker.net (no CVE)" --result "WARNING" --color RED
FOUND=1
else
logtext "Result: Not vulnerable to exploit #3 on shellshocker.net (no CVE)"
#Display --indent 4 --text "- Exploit#3 on shellshocker.net (no CVE)" --result "OK" --color GREEN
fi
else
logtext "Result: could not find bash to be a valid shell"
fi
if [ ${FOUND} -eq 1 ]; then
ReportWarning ${TEST_NO} "H" "System vulnerable to Shellshock (bash)"
AddHP 0 25
else
AddHP 5 5
fi
fi
#
#################################################################################
#
report "session_timeout_enabled=${IDLE_TIMEOUT}"
wait_for_keypress
#
#================================================================================
# Lynis - Copyright 2007-2014, Michael Boelen - www.rootkit.nl - The Netherlands
|