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authorOvidiu Panait <ovidiu.panait@windriver.com>2020-09-01 12:22:00 +0300
committerArmin Kuster <akuster808@gmail.com>2020-09-03 08:28:37 -0700
commitd7b41ced4b9a9a68083b0fcceff3b226298cff8b (patch)
tree03ec3cfb6aa87e35f4fa14fc3af29e0994765c4c
parentb72b233d268c51376ecfa277ea8346621f632467 (diff)
downloadmeta-openembedded-d7b41ced4b9a9a68083b0fcceff3b226298cff8b.tar.gz
net-snmp: Fix CVE-2020-15861 and CVE-2020-15862
Net-SNMP through 5.7.3 allows Escalation of Privileges because of UNIX symbolic link (symlink) following. Net-SNMP through 5.7.3 has Improper Privilege Management because SNMP WRITE access to the EXTEND MIB provides the ability to run arbitrary commands as root. References: https://nvd.nist.gov/vuln/detail/CVE-2020-15861 https://nvd.nist.gov/vuln/detail/CVE-2020-15862 Upstream patches: https://github.com/net-snmp/net-snmp/commit/2b3e300ade4add03b889e61d610b0db77d300fc3 https://github.com/net-snmp/net-snmp/commit/9cfb38b0aa95363da1466ca81dd929989ba27c1f https://github.com/net-snmp/net-snmp/commit/114e4c2cec2601ca56e8afb1f441520f75a9a312 https://github.com/net-snmp/net-snmp/commit/2968b455e6f182f329746e2bca1043f368618c73 https://github.com/net-snmp/net-snmp/commit/4fd9a450444a434a993bc72f7c3486ccce41f602 https://github.com/net-snmp/net-snmp/commit/77f6c60f57dba0aaea5d8ef1dd94bcd0c8e6d205 CVE-2020-15861-0005.patch is the actual fix for CVE-2020-15861 and CVE-2020-15861-0001.patch through CVE-2020-15861-0004.patch are context patches needed by the fix to apply cleanly. Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> Signed-off-by: Armin Kuster <akuster808@gmail.com>
Diffstat
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0001.patch164
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0002.patch44
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0003.patch40
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0004.patch33
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0005.patch349
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15862.patch87
-rw-r--r--meta-networking/recipes-protocols/net-snmp/net-snmp_5.8.bb6
7 files changed, 723 insertions, 0 deletions
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0001.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0001.patch
new file mode 100644
index 0000000000..f43803a663
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0001.patch
@@ -0,0 +1,164 @@
1From c449946b9d06571b447fce3fc0dcad89e8df05b5 Mon Sep 17 00:00:00 2001
2From: Bart Van Assche <bvanassche@acm.org>
3Date: Wed, 15 May 2019 14:09:25 +0200
4Subject: [PATCH 1/5] CHANGES: libsnmp: Scan MIB directories in alphabetical
5 order
6
7This guarantees that e.g. mibs/RFC1213-MIB.txt is read before mibs/SNMPv2-MIB.txt.
8The order in which these MIBs is read matters because both define sysLocation but
9with different attributes.
10
11CVE: CVE-2020-15861
12Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/2b3e300ade4add03b889e61d610b0db77d300fc3]
13
14Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
15---
16 snmplib/parse.c | 113 +++++++++++++++++++++++++++++++++++-------------
17 1 file changed, 82 insertions(+), 31 deletions(-)
18
19diff --git a/snmplib/parse.c b/snmplib/parse.c
20index 7678b35..51d119b 100644
21--- a/snmplib/parse.c
22+++ b/snmplib/parse.c
23@@ -4894,6 +4894,79 @@ add_mibfile(const char* tmpstr, const char* d_name, FILE *ip )
24 }
25 }
26
27+static int elemcmp(const void *a, const void *b)
28+{
29+ const char *const *s1 = a, *const *s2 = b;
30+
31+ return strcmp(*s1, *s2);
32+}
33+
34+/*
35+ * Scan a directory and return all filenames found as an array of pointers to
36+ * directory entries (@result).
37+ */
38+static int scan_directory(char ***result, const char *dirname)
39+{
40+ DIR *dir, *dir2;
41+ struct dirent *file;
42+ char **filenames = NULL;
43+ int fname_len, i, filename_count = 0, array_size = 0;
44+ char *tmpstr;
45+
46+ *result = NULL;
47+
48+ dir = opendir(dirname);
49+ if (!dir)
50+ return -1;
51+
52+ while ((file = readdir(dir))) {
53+ /*
54+ * Only parse file names that don't begin with a '.'
55+ * Also skip files ending in '~', or starting/ending
56+ * with '#' which are typically editor backup files.
57+ */
58+ fname_len = strlen(file->d_name);
59+ if (fname_len > 0 && file->d_name[0] != '.'
60+ && file->d_name[0] != '#'
61+ && file->d_name[fname_len-1] != '#'
62+ && file->d_name[fname_len-1] != '~') {
63+ if (asprintf(&tmpstr, "%s/%s", dirname, file->d_name) < 0)
64+ continue;
65+ dir2 = opendir(tmpstr);
66+ if (dir2) {
67+ /* file is a directory, don't read it */
68+ closedir(dir2);
69+ } else {
70+ if (filename_count >= array_size) {
71+ char **new_filenames;
72+
73+ array_size = (array_size + 16) * 2;
74+ new_filenames = realloc(filenames,
75+ array_size * sizeof(filenames[0]));
76+ if (!new_filenames) {
77+ free(tmpstr);
78+ for (i = 0; i < filename_count; i++)
79+ free(filenames[i]);
80+ free(filenames);
81+ closedir(dir);
82+ return -1;
83+ }
84+ filenames = new_filenames;
85+ }
86+ filenames[filename_count++] = tmpstr;
87+ tmpstr = NULL;
88+ }
89+ free(tmpstr);
90+ }
91+ }
92+ closedir(dir);
93+
94+ qsort(filenames, filename_count, sizeof(filenames[0]), elemcmp);
95+ *result = filenames;
96+
97+ return filename_count;
98+}
99+
100 /* For Win32 platforms, the directory does not maintain a last modification
101 * date that we can compare with the modification date of the .index file.
102 * Therefore there is no way to know whether any .index file is valid.
103@@ -4904,12 +4977,11 @@ int
104 add_mibdir(const char *dirname)
105 {
106 FILE *ip;
107- DIR *dir, *dir2;
108 const char *oldFile = File;
109- struct dirent *file;
110+ char **filenames;
111 char tmpstr[300];
112 int count = 0;
113- int fname_len = 0;
114+ int filename_count, i;
115 #if !(defined(WIN32) || defined(cygwin))
116 char *token;
117 char space;
118@@ -4957,36 +5029,15 @@ add_mibdir(const char *dirname)
119 DEBUGMSGTL(("parse-mibs", "No index\n"));
120 #endif
121
122- if ((dir = opendir(dirname))) {
123- ip = netsnmp_mibindex_new( dirname );
124- while ((file = readdir(dir))) {
125- /*
126- * Only parse file names that don't begin with a '.'
127- * Also skip files ending in '~', or starting/ending
128- * with '#' which are typically editor backup files.
129- */
130- if (file->d_name != NULL) {
131- fname_len = strlen( file->d_name );
132- if (fname_len > 0 && file->d_name[0] != '.'
133- && file->d_name[0] != '#'
134- && file->d_name[fname_len-1] != '#'
135- && file->d_name[fname_len-1] != '~') {
136- snprintf(tmpstr, sizeof(tmpstr), "%s/%s", dirname, file->d_name);
137- tmpstr[ sizeof(tmpstr)-1 ] = 0;
138- if ((dir2 = opendir(tmpstr))) {
139- /*
140- * file is a directory, don't read it
141- */
142- closedir(dir2);
143- } else {
144- if ( !add_mibfile( tmpstr, file->d_name, ip ))
145- count++;
146- }
147- }
148- }
149+ filename_count = scan_directory(&filenames, dirname);
150+
151+ if (filename_count >= 0) {
152+ ip = netsnmp_mibindex_new(dirname);
153+ for (i = 0; i < filename_count; i++) {
154+ if (add_mibfile(filenames[i], strrchr(filenames[i], '/'), ip) == 0)
155+ count++;
156 }
157 File = oldFile;
158- closedir(dir);
159 if (ip)
160 fclose(ip);
161 return (count);
162--
1632.17.1
164
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0002.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0002.patch
new file mode 100644
index 0000000000..e54a8b4acb
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0002.patch
@@ -0,0 +1,44 @@
1From 50118392c58c8d9554580373c0dbc542336b58a9 Mon Sep 17 00:00:00 2001
2From: Bart Van Assche <bvanassche@acm.org>
3Date: Thu, 16 May 2019 13:49:05 +0200
4Subject: [PATCH 2/5] libsnmp: Fix two recently introduced issues in the MIB
5 parsing code
6
7Ensure that the first argument passed to qsort() is not NULL. Free the memory
8that holds the directory contents.
9
10Fixes: 2b3e300ade4a ("CHANGES: libsnmp: Scan MIB directories in alphabetical order")
11
12CVE: CVE-2020-15861
13Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/9cfb38b0aa95363da1466ca81dd929989ba27c1f]
14
15Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
16---
17 snmplib/parse.c | 4 +++-
18 1 file changed, 3 insertions(+), 1 deletion(-)
19
20diff --git a/snmplib/parse.c b/snmplib/parse.c
21index 51d119b..200ba25 100644
22--- a/snmplib/parse.c
23+++ b/snmplib/parse.c
24@@ -4961,7 +4961,8 @@ static int scan_directory(char ***result, const char *dirname)
25 }
26 closedir(dir);
27
28- qsort(filenames, filename_count, sizeof(filenames[0]), elemcmp);
29+ if (filenames)
30+ qsort(filenames, filename_count, sizeof(filenames[0]), elemcmp);
31 *result = filenames;
32
33 return filename_count;
34@@ -5040,6 +5041,7 @@ add_mibdir(const char *dirname)
35 File = oldFile;
36 if (ip)
37 fclose(ip);
38+ free(filenames);
39 return (count);
40 }
41 else
42--
432.17.1
44
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0003.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0003.patch
new file mode 100644
index 0000000000..03acbbab92
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0003.patch
@@ -0,0 +1,40 @@
1From c98808036c86a4ac4877ea13dbcef096b57e49f8 Mon Sep 17 00:00:00 2001
2From: Bart Van Assche <bvanassche@acm.org>
3Date: Wed, 22 May 2019 10:08:53 +0200
4Subject: [PATCH 3/5] libsnmp: Fix a compiler warning
5
6Avoid that the compiler complains on Windows systems that tmpstr[] is not used.
7
8Fixes: 2b3e300ade4a ("CHANGES: libsnmp: Scan MIB directories in alphabetical order")
9
10CVE: CVE-2020-15861
11Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/114e4c2cec2601ca56e8afb1f441520f75a9a312]
12
13Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
14---
15 snmplib/parse.c | 2 +-
16 1 file changed, 1 insertion(+), 1 deletion(-)
17
18diff --git a/snmplib/parse.c b/snmplib/parse.c
19index 200ba25..0414337 100644
20--- a/snmplib/parse.c
21+++ b/snmplib/parse.c
22@@ -4980,7 +4980,6 @@ add_mibdir(const char *dirname)
23 FILE *ip;
24 const char *oldFile = File;
25 char **filenames;
26- char tmpstr[300];
27 int count = 0;
28 int filename_count, i;
29 #if !(defined(WIN32) || defined(cygwin))
30@@ -4988,6 +4987,7 @@ add_mibdir(const char *dirname)
31 char space;
32 char newline;
33 struct stat dir_stat, idx_stat;
34+ char tmpstr[300];
35 char tmpstr1[300];
36 #endif
37
38--
392.17.1
40
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0004.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0004.patch
new file mode 100644
index 0000000000..f0e709636e
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0004.patch
@@ -0,0 +1,33 @@
1From 545742d1867d70a645a63161ede4a391456691fc Mon Sep 17 00:00:00 2001
2From: Bill Fenner <fenner@gmail.com>
3Date: Mon, 3 Jun 2019 10:01:08 -0700
4Subject: [PATCH 4/5] libsnmp: free filenames from directory listing
5
6Free each filename as we use it, as well as freeing the
7list of filenames.
8
9Fixes: 2b3e300ade4a ("CHANGES: libsnmp: Scan MIB directories in alphabetical order")
10
11CVE: CVE-2020-15861
12Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/2968b455e6f182f329746e2bca1043f368618c73]
13
14Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
15---
16 snmplib/parse.c | 1 +
17 1 file changed, 1 insertion(+)
18
19diff --git a/snmplib/parse.c b/snmplib/parse.c
20index 0414337..7f98542 100644
21--- a/snmplib/parse.c
22+++ b/snmplib/parse.c
23@@ -5037,6 +5037,7 @@ add_mibdir(const char *dirname)
24 for (i = 0; i < filename_count; i++) {
25 if (add_mibfile(filenames[i], strrchr(filenames[i], '/'), ip) == 0)
26 count++;
27+ free(filenames[i]);
28 }
29 File = oldFile;
30 if (ip)
31--
322.17.1
33
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0005.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0005.patch
new file mode 100644
index 0000000000..66a16f6dbf
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15861-0005.patch
@@ -0,0 +1,349 @@
1From 83d6c5181828921b3731878588b3728de704d490 Mon Sep 17 00:00:00 2001
2From: Bart Van Assche <bvanassche@acm.org>
3Date: Wed, 22 May 2019 09:56:21 +0200
4Subject: [PATCH 5/5] CHANGES: snmpd: Stop reading and writing the
5 mib_indexes/* files
6
7Caching directory contents is something the operating system should do
8and is not something Net-SNMP should do. Instead of storing a copy of
9the directory contents in ${tmp_dir}/mib_indexes/${n}, always scan a
10MIB directory.
11
12CVE: CVE-2020-15861
13Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/4fd9a450444a434a993bc72f7c3486ccce41f602]
14
15Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
16---
17 .gitignore | 1 -
18 include/net-snmp/library/mib.h | 3 -
19 include/net-snmp/library/parse.h | 2 +-
20 snmplib/mib.c | 148 +------------------------------
21 snmplib/parse.c | 57 +-----------
22 5 files changed, 4 insertions(+), 207 deletions(-)
23
24diff --git a/.gitignore b/.gitignore
25index 2d37bc6..94da568 100644
26--- a/.gitignore
27+++ b/.gitignore
28@@ -75,7 +75,6 @@ Makefile
29 man/*.[1358]
30 man/default_store.3.h
31 man/manaliases
32-mibs/.index
33 mk/
34 module_tmp_header.h
35 net-snmp-5*
36diff --git a/include/net-snmp/library/mib.h b/include/net-snmp/library/mib.h
37index ab36853..3e81634 100644
38--- a/include/net-snmp/library/mib.h
39+++ b/include/net-snmp/library/mib.h
40@@ -124,9 +124,6 @@ SOFTWARE.
41 NETSNMP_IMPORT
42 char *netsnmp_get_mib_directory(void);
43 void netsnmp_fixup_mib_directory(void);
44- void netsnmp_mibindex_load( void );
45- char * netsnmp_mibindex_lookup( const char * );
46- FILE * netsnmp_mibindex_new( const char * );
47 int sprint_realloc_description(u_char ** buf, size_t * buf_len,
48 size_t * out_len, int allow_realloc,
49 oid * objid, size_t objidlen, int width);
50diff --git a/include/net-snmp/library/parse.h b/include/net-snmp/library/parse.h
51index ce46ab9..7c33d3f 100644
52--- a/include/net-snmp/library/parse.h
53+++ b/include/net-snmp/library/parse.h
54@@ -201,7 +201,7 @@ SOFTWARE.
55 #endif
56 void netsnmp_init_mib_internals(void);
57 void unload_all_mibs(void);
58- int add_mibfile(const char*, const char*, FILE *);
59+ int add_mibfile(const char*, const char*);
60 int which_module(const char *);
61 NETSNMP_IMPORT
62 char *module_name(int, char *);
63diff --git a/snmplib/mib.c b/snmplib/mib.c
64index 1c875c0..30d6cde 100644
65--- a/snmplib/mib.c
66+++ b/snmplib/mib.c
67@@ -2717,7 +2717,6 @@ netsnmp_init_mib(void)
68 env_var = strdup(netsnmp_get_mib_directory());
69 if (!env_var)
70 return;
71- netsnmp_mibindex_load();
72
73 DEBUGMSGTL(("init_mib",
74 "Seen MIBDIRS: Looking in '%s' for mib dirs ...\n",
75@@ -2737,7 +2736,7 @@ netsnmp_init_mib(void)
76 else
77 entry = strtok_r(env_var, ENV_SEPARATOR, &st);
78 while (entry) {
79- add_mibfile(entry, NULL, NULL);
80+ add_mibfile(entry, NULL);
81 entry = strtok_r(NULL, ENV_SEPARATOR, &st);
82 }
83 }
84@@ -2888,142 +2887,6 @@ init_mib(void)
85 #endif
86
87
88-/*
89- * Handle MIB indexes centrally
90- */
91-static int _mibindex = 0; /* Last index in use */
92-static int _mibindex_max = 0; /* Size of index array */
93-char **_mibindexes = NULL;
94-
95-int _mibindex_add( const char *dirname, int i );
96-void
97-netsnmp_mibindex_load( void )
98-{
99- DIR *dir;
100- struct dirent *file;
101- FILE *fp;
102- char tmpbuf[ 300];
103- char tmpbuf2[300];
104- int i;
105- char *cp;
106-
107- /*
108- * Open the MIB index directory, or create it (empty)
109- */
110- snprintf( tmpbuf, sizeof(tmpbuf), "%s/mib_indexes",
111- get_persistent_directory());
112- tmpbuf[sizeof(tmpbuf)-1] = 0;
113- dir = opendir( tmpbuf );
114- if ( dir == NULL ) {
115- DEBUGMSGTL(("mibindex", "load: (new)\n"));
116- mkdirhier( tmpbuf, NETSNMP_AGENT_DIRECTORY_MODE, 0);
117- return;
118- }
119-
120- /*
121- * Create a list of which directory each file refers to
122- */
123- while ((file = readdir( dir ))) {
124- if ( !isdigit((unsigned char)(file->d_name[0])))
125- continue;
126- i = atoi( file->d_name );
127-
128- snprintf( tmpbuf, sizeof(tmpbuf), "%s/mib_indexes/%d",
129- get_persistent_directory(), i );
130- tmpbuf[sizeof(tmpbuf)-1] = 0;
131- fp = fopen( tmpbuf, "r" );
132- if (!fp)
133- continue;
134- cp = fgets( tmpbuf2, sizeof(tmpbuf2), fp );
135- fclose( fp );
136- if ( !cp ) {
137- DEBUGMSGTL(("mibindex", "Empty MIB index (%d)\n", i));
138- continue;
139- }
140- if ( strncmp( tmpbuf2, "DIR ", 4 ) != 0 ) {
141- DEBUGMSGTL(("mibindex", "Malformed MIB index (%d)\n", i));
142- continue;
143- }
144- tmpbuf2[strlen(tmpbuf2)-1] = 0;
145- DEBUGMSGTL(("mibindex", "load: (%d) %s\n", i, tmpbuf2));
146- (void)_mibindex_add( tmpbuf2+4, i ); /* Skip 'DIR ' */
147- }
148- closedir( dir );
149-}
150-
151-char *
152-netsnmp_mibindex_lookup( const char *dirname )
153-{
154- int i;
155- static char tmpbuf[300];
156-
157- for (i=0; i<_mibindex; i++) {
158- if ( _mibindexes[i] &&
159- strcmp( _mibindexes[i], dirname ) == 0) {
160- snprintf(tmpbuf, sizeof(tmpbuf), "%s/mib_indexes/%d",
161- get_persistent_directory(), i);
162- tmpbuf[sizeof(tmpbuf)-1] = 0;
163- DEBUGMSGTL(("mibindex", "lookup: %s (%d) %s\n", dirname, i, tmpbuf ));
164- return tmpbuf;
165- }
166- }
167- DEBUGMSGTL(("mibindex", "lookup: (none)\n"));
168- return NULL;
169-}
170-
171-int
172-_mibindex_add( const char *dirname, int i )
173-{
174- const int old_mibindex_max = _mibindex_max;
175-
176- DEBUGMSGTL(("mibindex", "add: %s (%d)\n", dirname, i ));
177- if ( i == -1 )
178- i = _mibindex++;
179- if ( i >= _mibindex_max ) {
180- /*
181- * If the index array is full (or non-existent)
182- * then expand (or create) it
183- */
184- _mibindex_max = i + 10;
185- _mibindexes = realloc(_mibindexes,
186- _mibindex_max * sizeof(_mibindexes[0]));
187- netsnmp_assert(_mibindexes);
188- memset(_mibindexes + old_mibindex_max, 0,
189- (_mibindex_max - old_mibindex_max) * sizeof(_mibindexes[0]));
190- }
191-
192- _mibindexes[ i ] = strdup( dirname );
193- if ( i >= _mibindex )
194- _mibindex = i+1;
195-
196- DEBUGMSGTL(("mibindex", "add: %d/%d/%d\n", i, _mibindex, _mibindex_max ));
197- return i;
198-}
199-
200-FILE *
201-netsnmp_mibindex_new( const char *dirname )
202-{
203- FILE *fp;
204- char tmpbuf[300];
205- char *cp;
206- int i;
207-
208- cp = netsnmp_mibindex_lookup( dirname );
209- if (!cp) {
210- i = _mibindex_add( dirname, -1 );
211- snprintf( tmpbuf, sizeof(tmpbuf), "%s/mib_indexes/%d",
212- get_persistent_directory(), i );
213- tmpbuf[sizeof(tmpbuf)-1] = 0;
214- cp = tmpbuf;
215- }
216- DEBUGMSGTL(("mibindex", "new: %s (%s)\n", dirname, cp ));
217- fp = fopen( cp, "w" );
218- if (fp)
219- fprintf( fp, "DIR %s\n", dirname );
220- return fp;
221-}
222-
223-
224 /**
225 * Unloads all mibs.
226 */
227@@ -3038,15 +2901,6 @@ shutdown_mib(void)
228 }
229 tree_head = NULL;
230 Mib = NULL;
231- if (_mibindexes) {
232- int i;
233- for (i = 0; i < _mibindex; ++i)
234- SNMP_FREE(_mibindexes[i]);
235- free(_mibindexes);
236- _mibindex = 0;
237- _mibindex_max = 0;
238- _mibindexes = NULL;
239- }
240 if (Prefix != NULL && Prefix != &Standard_Prefix[0])
241 SNMP_FREE(Prefix);
242 if (Prefix)
243diff --git a/snmplib/parse.c b/snmplib/parse.c
244index 7f98542..58d777e 100644
245--- a/snmplib/parse.c
246+++ b/snmplib/parse.c
247@@ -607,8 +607,6 @@ static int read_module_replacements(const char *);
248 static int read_import_replacements(const char *,
249 struct module_import *);
250
251-static void new_module(const char *, const char *);
252-
253 static struct node *merge_parse_objectid(struct node *, FILE *, char *);
254 static struct index_list *getIndexes(FILE * fp, struct index_list **);
255 static struct varbind_list *getVarbinds(FILE * fp, struct varbind_list **);
256@@ -4859,7 +4857,7 @@ snmp_get_token(FILE * fp, char *token, int maxtlen)
257 #endif /* NETSNMP_FEATURE_REMOVE_PARSE_GET_TOKEN */
258
259 int
260-add_mibfile(const char* tmpstr, const char* d_name, FILE *ip )
261+add_mibfile(const char* tmpstr, const char* d_name)
262 {
263 FILE *fp;
264 char token[MAXTOKEN], token2[MAXTOKEN];
265@@ -4884,8 +4882,6 @@ add_mibfile(const char* tmpstr, const char* d_name, FILE *ip )
266 */
267 if (get_token(fp, token2, MAXTOKEN) == DEFINITIONS) {
268 new_module(token, tmpstr);
269- if (ip)
270- fprintf(ip, "%s %s\n", token, d_name);
271 fclose(fp);
272 return 0;
273 } else {
274@@ -4977,71 +4973,22 @@ static int scan_directory(char ***result, const char *dirname)
275 int
276 add_mibdir(const char *dirname)
277 {
278- FILE *ip;
279 const char *oldFile = File;
280 char **filenames;
281 int count = 0;
282 int filename_count, i;
283-#if !(defined(WIN32) || defined(cygwin))
284- char *token;
285- char space;
286- char newline;
287- struct stat dir_stat, idx_stat;
288- char tmpstr[300];
289- char tmpstr1[300];
290-#endif
291
292 DEBUGMSGTL(("parse-mibs", "Scanning directory %s\n", dirname));
293-#if !(defined(WIN32) || defined(cygwin))
294- token = netsnmp_mibindex_lookup( dirname );
295- if (token && stat(token, &idx_stat) == 0 && stat(dirname, &dir_stat) == 0) {
296- if (dir_stat.st_mtime < idx_stat.st_mtime) {
297- DEBUGMSGTL(("parse-mibs", "The index is good\n"));
298- if ((ip = fopen(token, "r")) != NULL) {
299- fgets(tmpstr, sizeof(tmpstr), ip); /* Skip dir line */
300- while (fscanf(ip, "%127s%c%299[^\n]%c", token, &space, tmpstr,
301- &newline) == 4) {
302-
303- /*
304- * If an overflow of the token or tmpstr buffers has been
305- * found log a message and break out of the while loop,
306- * thus the rest of the file tokens will be ignored.
307- */
308- if (space != ' ' || newline != '\n') {
309- snmp_log(LOG_ERR,
310- "add_mibdir: strings scanned in from %s/%s " \
311- "are too large. count = %d\n ", dirname,
312- ".index", count);
313- break;
314- }
315-
316- snprintf(tmpstr1, sizeof(tmpstr1), "%s/%s", dirname, tmpstr);
317- tmpstr1[ sizeof(tmpstr1)-1 ] = 0;
318- new_module(token, tmpstr1);
319- count++;
320- }
321- fclose(ip);
322- return count;
323- } else
324- DEBUGMSGTL(("parse-mibs", "Can't read index\n"));
325- } else
326- DEBUGMSGTL(("parse-mibs", "Index outdated\n"));
327- } else
328- DEBUGMSGTL(("parse-mibs", "No index\n"));
329-#endif
330
331 filename_count = scan_directory(&filenames, dirname);
332
333 if (filename_count >= 0) {
334- ip = netsnmp_mibindex_new(dirname);
335 for (i = 0; i < filename_count; i++) {
336- if (add_mibfile(filenames[i], strrchr(filenames[i], '/'), ip) == 0)
337+ if (add_mibfile(filenames[i], strrchr(filenames[i], '/')) == 0)
338 count++;
339 free(filenames[i]);
340 }
341 File = oldFile;
342- if (ip)
343- fclose(ip);
344 free(filenames);
345 return (count);
346 }
347--
3482.17.1
349
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15862.patch b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15862.patch
new file mode 100644
index 0000000000..419a0c21bb
--- /dev/null
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp/CVE-2020-15862.patch
@@ -0,0 +1,87 @@
1From de36cf1ecbb13a9541ec5d43ce20ab5030861837 Mon Sep 17 00:00:00 2001
2From: Wes Hardaker <opensource@hardakers.net>
3Date: Thu, 23 Jul 2020 16:17:27 -0700
4Subject: [PATCH 1/1] make the extend mib read-only by default
5
6CVE: CVE-2020-15862
7Upstream-Status: Backport [https://github.com/net-snmp/net-snmp/commit/77f6c60f57dba0aaea5d8ef1dd94bcd0c8e6d205]
8
9Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
10---
11 agent/mibgroup/agent/extend.c | 18 ++++++++++++------
12 1 file changed, 12 insertions(+), 6 deletions(-)
13
14diff --git a/agent/mibgroup/agent/extend.c b/agent/mibgroup/agent/extend.c
15index 5f8cedc..38a6c50 100644
16--- a/agent/mibgroup/agent/extend.c
17+++ b/agent/mibgroup/agent/extend.c
18@@ -16,6 +16,12 @@
19 #define SHELLCOMMAND 3
20 #endif
21
22+/* This mib is potentially dangerous to turn on by default, since it
23+ * allows arbitrary commands to be set by anyone with SNMP WRITE
24+ * access to the MIB table. If all of your users are "root" level
25+ * users, then it may be safe to turn on. */
26+#define ENABLE_EXTEND_WRITE_ACCESS 0
27+
28 netsnmp_feature_require(extract_table_row_data)
29 netsnmp_feature_require(table_data_delete_table)
30 #ifndef NETSNMP_NO_WRITE_SUPPORT
31@@ -742,7 +748,7 @@ handle_nsExtendConfigTable(netsnmp_mib_handler *handler,
32 *
33 **********/
34
35-#ifndef NETSNMP_NO_WRITE_SUPPORT
36+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
37 case MODE_SET_RESERVE1:
38 /*
39 * Validate the new assignments
40@@ -1068,7 +1074,7 @@ handle_nsExtendConfigTable(netsnmp_mib_handler *handler,
41 }
42 }
43 break;
44-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
45+#endif /* !NETSNMP_NO_WRITE_SUPPORT and ENABLE_EXTEND_WRITE_ACCESS */
46
47 default:
48 netsnmp_set_request_error(reqinfo, request, SNMP_ERR_GENERR);
49@@ -1076,7 +1082,7 @@ handle_nsExtendConfigTable(netsnmp_mib_handler *handler,
50 }
51 }
52
53-#ifndef NETSNMP_NO_WRITE_SUPPORT
54+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
55 /*
56 * If we're marking a given row as active,
57 * then we need to check that it's ready.
58@@ -1101,7 +1107,7 @@ handle_nsExtendConfigTable(netsnmp_mib_handler *handler,
59 }
60 }
61 }
62-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
63+#endif /* !NETSNMP_NO_WRITE_SUPPORT && ENABLE_EXTEND_WRITE_ACCESS */
64
65 return SNMP_ERR_NOERROR;
66 }
67@@ -1590,7 +1596,7 @@ fixExec2Error(int action,
68 idx = name[name_len-1] -1;
69 exten = &compatability_entries[ idx ];
70
71-#ifndef NETSNMP_NO_WRITE_SUPPORT
72+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
73 switch (action) {
74 case MODE_SET_RESERVE1:
75 if (var_val_type != ASN_INTEGER) {
76@@ -1611,7 +1617,7 @@ fixExec2Error(int action,
77 case MODE_SET_COMMIT:
78 netsnmp_cache_check_and_reload( exten->efix_entry->cache );
79 }
80-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
81+#endif /* !NETSNMP_NO_WRITE_SUPPORT && ENABLE_EXTEND_WRITE_ACCESS */
82 return SNMP_ERR_NOERROR;
83 }
84 #endif /* USING_UCD_SNMP_EXTENSIBLE_MODULE */
85--
862.17.1
87
diff --git a/meta-networking/recipes-protocols/net-snmp/net-snmp_5.8.bb b/meta-networking/recipes-protocols/net-snmp/net-snmp_5.8.bb
index 67316db0d2..6b4b6ce8ed 100644
--- a/meta-networking/recipes-protocols/net-snmp/net-snmp_5.8.bb
+++ b/meta-networking/recipes-protocols/net-snmp/net-snmp_5.8.bb
@@ -29,6 +29,12 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/net-snmp/net-snmp-${PV}.tar.gz \
29 file://0001-net-snmp-fix-compile-error-disable-des.patch \ 29 file://0001-net-snmp-fix-compile-error-disable-des.patch \
30 file://0001-Add-pkg-config-support-for-building-applications-and.patch \ 30 file://0001-Add-pkg-config-support-for-building-applications-and.patch \
31 file://CVE-2019-20892.patch \ 31 file://CVE-2019-20892.patch \
32 file://CVE-2020-15861-0001.patch \
33 file://CVE-2020-15861-0002.patch \
34 file://CVE-2020-15861-0003.patch \
35 file://CVE-2020-15861-0004.patch \
36 file://CVE-2020-15861-0005.patch \
37 file://CVE-2020-15862.patch \
32 " 38 "
33SRC_URI[md5sum] = "63bfc65fbb86cdb616598df1aff6458a" 39SRC_URI[md5sum] = "63bfc65fbb86cdb616598df1aff6458a"
34SRC_URI[sha256sum] = "b2fc3500840ebe532734c4786b0da4ef0a5f67e51ef4c86b3345d697e4976adf" 40SRC_URI[sha256sum] = "b2fc3500840ebe532734c4786b0da4ef0a5f67e51ef4c86b3345d697e4976adf"
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2025-07-26 04:38:04 +0000