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Bug #42631 mssql_connect causes stack smashing attack protection
Submitted: 2007-09-11 20:31 UTC Modified: 2013-02-18 00:33 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: gabe at mudbugmedia dot com Assigned:
Status: No Feedback Package: MSSQL related
PHP Version: 5.2.4 OS: Gentoo Linux 2.6.17-hardened-r1
Private report: No CVE-ID: None
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From: gabe at mudbugmedia dot com
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 [2007-09-11 20:31 UTC] gabe at mudbugmedia dot com
Description:
------------
When executing a PHP script over Apache 2.2 SAPI (not CGI), 
mssql_connect() causes Apache to exit with the following in the 
syslog:

apache2: stack smashing attack in function tds_write_packet - 
terminated

This occurs only after successfully connecting to a valid MSSQL 
server, but before authentication information is verified; supplying 
invalid username/password will still cause the error to trigger.  
However, entering in a non-listening IP to connect to will return 
false and continue execution.

Gentoo developers identified this bug as PHP instead of Apache, as 
Apache is not responsible for the calling of the tds_write_packet() 
function

Bug originally submitted here, but was reclassified as being UPSTREAM:
http://bugs.gentoo.org/show_bug.cgi?id=191988


an strace of the process (capture started after initial connect 
`netstat -p` after connection was the only way I could determine which 
apache process to strace):
Process 11348 attached - interrupt to quit
poll([{fd=1027, events=POLLIN, revents=POLLIN}], 1, 300000) = 1
read(1027, "Host: kokiri.org\r\n", 8000) = 18
poll([{fd=1027, events=POLLIN, revents=POLLIN}], 1, 300000) = 1
read(1027, "\r\n", 8000)                = 2
gettimeofday({1189537767, 899761}, NULL) = 0
gettimeofday({1189537767, 899905}, NULL) = 0
stat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
open("/www/.htaccess", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file 
or directory)
open("/www/kokiri.org/.htaccess", O_RDONLY|O_LARGEFILE) = -1 ENOENT 
(No such file or directory)
open("/www/kokiri.org/htdocs/.htaccess", O_RDONLY|O_LARGEFILE) = 1028
fstat64(1028, {st_mode=S_IFREG|0664, st_size=79, ...}) = 0
read(1028, "RewriteEngine on\n\nRewriteRule ro"..., 4096) = 79
read(1028, "", 4096)                    = 0
close(1028)                             = 0
open("/www/kokiri.org/htdocs/findwork.php/.htaccess", 
O_RDONLY|O_LARGEFILE) = -1 ENOTDIR (Not a directory)
setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={60, 0}}, NULL) = 
0
rt_sigaction(SIGPROF, {0x503ec97b, [PROF], SA_RESTORER|SA_RESTART, 
0x50aeab68}, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [PROF], NULL, 8) = 0
getcwd("/", 4095)                       = 2
chdir("/www/kokiri.org/htdocs")         = 0
setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={30, 0}}, NULL) = 
0
rt_sigaction(SIGPROF, {0x503ec97b, [PROF], SA_RESTORER|SA_RESTART, 
0x50aeab68}, {0x503ec97b, [PROF], SA_RESTORER|SA_RESTART, 0x50aeab68}, 
8) = 0
rt_sigprocmask(SIG_UNBLOCK, [PROF], NULL, 8) = 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www/kokiri.org/htdocs", {st_mode=S_IFDIR|0775, st_size=4096, 
...}) = 0
lstat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www/kokiri.org/htdocs", {st_mode=S_IFDIR|0775, st_size=4096, 
...}) = 0
lstat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www/kokiri.org/htdocs", {st_mode=S_IFDIR|0775, st_size=4096, 
...}) = 0
lstat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www/kokiri.org/htdocs", {st_mode=S_IFDIR|0775, st_size=4096, 
...}) = 0
lstat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
stat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
lstat64("/www", {st_mode=S_IFDIR|0775, st_size=16384, ...}) = 0
lstat64("/www/kokiri.org", {st_mode=S_IFDIR|0775, st_size=4096, ...}) 
= 0
lstat64("/www/kokiri.org/htdocs", {st_mode=S_IFDIR|0775, st_size=4096, 
...}) = 0
lstat64("/www/kokiri.org/htdocs/findwork.php", {st_mode=S_IFREG|0664, 
st_size=175, ...}) = 0
open("/www/kokiri.org/htdocs/findwork.php", O_RDONLY) = 1028
fstat64(1028, {st_mode=S_IFREG|0664, st_size=175, ...}) = 0
read(1028, "START!\r\n<?php \r\nob_flush();\r\nflu"..., 8192) = 175
read(1028, "", 8192)                    = 0
read(1028, "", 8192)                    = 0
close(1028)                             = 0
writev(1027, [{"HTTP/1.1 200 OK\r\nDate: Tue, 11 S"..., 125}, 
{"8\r\n", 3}, {"START!\r\n", 8}, {"\r\n", 2}], 4) = 138
brk(0x9fa8000)                          = 0x9fa8000
uname({sys="Linux", node="garlic", ...}) = 0
getuid32()                              = 81
open("/etc/passwd", O_RDONLY)           = 1028
fcntl64(1028, F_GETFD)                  = 0
fcntl64(1028, F_SETFD, FD_CLOEXEC)      = 0
_llseek(1028, 0, [0], SEEK_CUR)         = 0
fstat64(1028, {st_mode=S_IFREG|0644, st_size=3040, ...}) = 0
mmap2(NULL, 3040, PROT_READ, MAP_SHARED, 1028, 0) = 0x4fc52000
_llseek(1028, 3040, [3040], SEEK_SET)   = 0
munmap(0x4fc52000, 3040)                = 0
close(1028)                             = 0
open("/var/www/.freetds.conf", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/etc/freetds.conf", O_RDONLY|O_LARGEFILE) = 1028
fstat64(1028, {st_mode=S_IFREG|0644, st_size=3572, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0x4fc52000
read(1028, "#\n#\n#   $Id: freetds.conf,v 1.11"..., 4096) = 3572
read(1028, "", 4096)                    = 0
_llseek(1028, 0, [0], SEEK_SET)         = 0
read(1028, "#\n#\n#   $Id: freetds.conf,v 1.11"..., 4096) = 3572
read(1028, "", 4096)                    = 0
close(1028)                             = 0
munmap(0x4fc52000, 4096)                = 0
getuid32()                              = 81
open("/etc/passwd", O_RDONLY)           = 1028
fcntl64(1028, F_GETFD)                  = 0
fcntl64(1028, F_SETFD, FD_CLOEXEC)      = 0
_llseek(1028, 0, [0], SEEK_CUR)         = 0
fstat64(1028, {st_mode=S_IFREG|0644, st_size=3040, ...}) = 0
mmap2(NULL, 3040, PROT_READ, MAP_SHARED, 1028, 0) = 0x4fc52000
_llseek(1028, 3040, [3040], SEEK_SET)   = 0
munmap(0x4fc52000, 3040)                = 0
close(1028)                             = 0
open("/var/www/.interfaces", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/etc/freetds/interfaces", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No 
such file or directory)
open("/usr/lib/gconv/gconv-modules.cache", O_RDONLY) = 1028
fstat64(1028, {st_mode=S_IFREG|0644, st_size=25460, ...}) = 0
mmap2(NULL, 25460, PROT_READ, MAP_SHARED, 1028, 0) = 0x4fc4c000
close(1028)                             = 0
futex(0x50be4a4c, FUTEX_WAKE, 2147483647) = 0
open("/usr/lib/gconv/ISO8859-1.so", O_RDONLY) = 1028
read(1028, 
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240\4\0"..., 512) = 
512
fstat64(1028, {st_mode=S_IFREG|0755, st_size=9704, ...}) = 0
mmap2(NULL, 12300, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 
1028, 0) = 0x4fc48000
mmap2(0x4fc4a000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 1028, 0x1) = 0x4fc4a000
close(1028)                             = 0
mprotect(0x4fc4a000, 4096, PROT_READ)   = 0
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 1028
setsockopt(1028, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
setsockopt(1028, SOL_TCP, TCP_NODELAY, [1], 4) = 0
time(NULL)                              = 1189537767
ioctl(1028, FIONBIO, [1])               = 0
connect(1028, {sa_family=AF_INET, sin_port=htons(1433), 
sin_addr=inet_addr("70.252.177.xxx")}, 16) = -1 EINPROGRESS (Operation 
now in progress)
select(1029, NULL, [1024 1025 1026 1028], [1024 1025 1026 1028], {5, 
0}) = 2 (left {5, 0})
time(NULL)                              = 1189537767
getsockopt(1028, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
time(NULL)                              = 1189537767
select(1029, NULL, [1028], NULL, {5, 0}) = 1 (out [1028], left {4, 
820000})
time(NULL)                              = 1189537768
send(1028, 
"\2\0\2\0\0\0\0\0garlic\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 
MSG_NOSIGNAL|MSG_MORE) = 512
socket(PF_FILE, SOCK_DGRAM, 0)          = 1029
connect(1029, {sa_family=AF_FILE, path="/dev/log"}, 110) = -1 
EPROTOTYPE (Protocol wrong type for socket)
close(1029)                             = 0
socket(PF_FILE, SOCK_STREAM, 0)         = 1029
connect(1029, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0
write(2, "*** stack smashing detected ***:"..., 54) = 54
write(1029, "*** stack smashing detected ***:"..., 54) = 54
write(2, "apache2: stack smashing attack i"..., 73) = 73
write(1029, "apache2: stack smashing attack i"..., 73) = 73
write(2, "Report to http://bugs.gentoo.org"..., 35) = 35
write(1029, "Report to http://bugs.gentoo.org"..., 35) = 35
close(1029)                             = 0
getpid()                                = 11348
kill(11348, SIGKILL)                    = 0
+++ killed by SIGKILL +++
Process 11348 detached






Reproduce code:
---------------
START!
<?php 
ob_flush();
flush();
var_dump(mssql_connect('70.252.177.xxx', 'username', 'password'));
?>
DONE!



Expected result:
----------------
START!
resource(4) of type (mssql link)
DONE!






Actual result:
--------------
START!
(then Apache exits and the error is logged to syslog)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2007-09-12 14:30 UTC] gabe at mudbugmedia dot com
Same behavior occurs on the supplied dev link downloaded on 2007-09-12

configure settings for compile:

'./configure' '--prefix=/usr/lib/php5' '--host=i686-pc-linux-gnu' '--
mandir=/usr/lib/php5/man' '--infodir=/usr/lib/php5/info' '--
sysconfdir=/etc' '--cache-file=./config.cache' '--disable-cli' '--
with-apxs2=/usr/sbin/apxs2' '--with-config-file-path=/etc/php/apache2-
php5' '--with-config-file-scan-dir=/etc/php/apache2-php5/ext-active' 
'--without-pear' '--disable-bcmath' '--with-bz2' '--disable-calendar' 
'--with-curl' '--without-curlwrappers' '--disable-dbase' '--disable-
exif' '--without-fbsql' '--without-fdftk' '--disable-filter' '--
disable-ftp' '--with-gettext' '--without-gmp' '--disable-hash' '--
without-iconv' '--disable-ipv6' '--disable-json' '--without-kerberos' 
'--enable-mbstring' '--with-mcrypt' '--without-mhash' '--without-msql' 
'--with-mssql' '--without-ncurses' '--with-openssl' '--with-openssl-
dir=/usr' '--disable-pcntl' '--disable-pdo' '--without-pgsql' '--
without-pspell' '--without-recode' '--disable-reflection' '--disable-
simplexml' '--disable-shmop' '--without-snmp' '--disable-soap' '--
disable-sockets' '--disable-spl' '--without-sybase' '--without-sybase-
ct' '--disable-sysvmsg' '--disable-sysvsem' '--disable-sysvshm' '--
without-tidy' '--disable-tokenizer' '--disable-wddx' '--disable-
xmlreader' '--disable-xmlwriter' '--without-xmlrpc' '--without-xsl' '-
-disable-zip' '--with-zlib' '--disable-debug' '--without-cdb' '--
without-db4' '--without-flatfile' '--without-gdbm' '--without-inifile' 
'--without-qdbm' '--without-freetype-dir' '--without-t1lib' '--
disable-gd-jis-conv' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--
without-xpm-dir' '--with-gd' '--with-mysql=/usr' '--with-mysql-
sock=/var/run/mysqld/mysqld.sock' '--without-mysqli' '--with-readline' 
'--without-libedit' '--without-mm' '--without-sqlite' '--with-pic'
 [2010-10-09 00:18 UTC] felipe@php.net
-Status: Open +Status: Feedback
 [2010-10-09 00:18 UTC] felipe@php.net
Please try using this snapshot:

  http://snaps.php.net/php-trunk-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/


 [2013-02-18 00:33 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
 
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