Vulnerabilities > CVE-2006-5178 - Race Condition vulnerability in PHP
Attack vector
LOCAL Attack complexity
HIGH Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
Race condition in the symlink function in PHP 5.1.6 and earlier allows local users to bypass the open_basedir restriction by using a combination of symlink, mkdir, and unlink functions to change the file path after the open_basedir check and before the file is opened by the underlying system, as demonstrated by symlinking a symlink into a subdirectory, to point to a parent directory via .. (dot dot) sequences, and then unlinking the resulting symlink.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Exploit-Db
description | PHP 5.2.12/5.3.1 symlink() open_basedir bypass. CVE-2006-5178,CVE-2007-4652. Local exploit for php platform |
id | EDB-ID:10557 |
last seen | 2016-02-01 |
modified | 2009-12-19 |
published | 2009-12-19 |
reporter | Maksymilian Arciemowicz |
source | https://www.exploit-db.com/download/10557/ |
title | PHP 5.2.12/5.3.1 symlink open_basedir bypass |
Nessus
NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_EDABE438542F11DBA5AE00508D6A62DF.NASL description Stefan Esser reports : PHP last seen 2020-06-01 modified 2020-06-02 plugin id 22504 published 2006-10-05 reporter This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/22504 title FreeBSD : php -- open_basedir Race Condition Vulnerability (edabe438-542f-11db-a5ae-00508d6a62df) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from the FreeBSD VuXML database : # # Copyright 2003-2018 Jacques Vidrine and contributors # # Redistribution and use in source (VuXML) and 'compiled' forms (SGML, # HTML, PDF, PostScript, RTF and so forth) with or without modification, # are permitted provided that the following conditions are met: # 1. Redistributions of source code (VuXML) must retain the above # copyright notice, this list of conditions and the following # disclaimer as the first lines of this file unmodified. # 2. Redistributions in compiled form (transformed to other DTDs, # published online in any format, converted to PDF, PostScript, # RTF and other formats) must reproduce the above copyright # notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION, # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # include("compat.inc"); if (description) { script_id(22504); script_version("1.19"); script_cvs_date("Date: 2019/08/02 13:32:38"); script_cve_id("CVE-2006-5178"); script_bugtraq_id(20326); script_xref(name:"Secunia", value:"22235"); script_name(english:"FreeBSD : php -- open_basedir Race Condition Vulnerability (edabe438-542f-11db-a5ae-00508d6a62df)"); script_summary(english:"Checks for updated packages in pkg_info output"); script_set_attribute( attribute:"synopsis", value: "The remote FreeBSD host is missing one or more security-related updates." ); script_set_attribute( attribute:"description", value: "Stefan Esser reports : PHP's open_basedir feature is meant to disallow scripts to access files outside a set of configured base directories. The checks for this are placed within PHP functions dealing with files before the actual open call is performed. Obviously there is a little span of time between the check and the actual open call. During this time span the checked path could have been altered and point to a file that is forbidden to be accessed due to open_basedir restrictions. Because the open_basedir restrictions often not call PHP functions but 3rd party library functions to actually open the file it is impossible to close this time span in a general way. It would only be possible to close it when PHP handles the actual opening on it's own. While it seems hard to change the path during this little time span it is very simple with the use of the symlink() function combined with a little trick. PHP's symlink() function ensures that source and target of the symlink operation are allowed by open_basedir restrictions (and safe_mode). However it is possible to point a symlink to any file by the use of mkdir(), unlink() and at least two symlinks." ); script_set_attribute( attribute:"see_also", value:"http://www.hardened-php.net/advisory_082006.132.html" ); # https://vuxml.freebsd.org/freebsd/edabe438-542f-11db-a5ae-00508d6a62df.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?fc827001" ); script_set_attribute(attribute:"solution", value:"Update the affected packages."); script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:F/RL:U/RC:ND"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_cwe_id(362); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:mod_php4"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:mod_php5"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php-suhosin"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4-cgi"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4-cli"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4-dtc"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4-horde"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php4-nms"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5-cgi"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5-cli"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5-dtc"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5-horde"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:php5-nms"); script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd"); script_set_attribute(attribute:"vuln_publication_date", value:"2006/10/02"); script_set_attribute(attribute:"patch_publication_date", value:"2006/10/05"); script_set_attribute(attribute:"plugin_publication_date", value:"2006/10/05"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2006-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"FreeBSD Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info"); exit(0); } include("audit.inc"); include("freebsd_package.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD"); if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (pkg_test(save_report:TRUE, pkg:"php4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php-suhosin<0.9.6")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-cli>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-cli>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-cli>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-cli>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-cgi>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-cgi>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-cgi>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-cgi>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-dtc>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-dtc>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-dtc>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-dtc>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-horde>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-horde>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-horde>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-horde>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-nms>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php4-nms>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-nms>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"php5-nms>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"mod_php4>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"mod_php4>=5<5.1.6_2")) flag++; if (pkg_test(save_report:TRUE, pkg:"mod_php5>=4<4.4.4_1")) flag++; if (pkg_test(save_report:TRUE, pkg:"mod_php5>=5<5.1.6_2")) flag++; if (flag) { if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get()); else security_warning(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");
NASL family CGI abuses NASL id PHP_SYMLINK_FUNCTION_RACE_CONDITION.NASL description According to its banner, the version of PHP installed on the remote host is affected by a security bypass vulnerability. A race condition exists in the symlink function that allows local users to bypass the open_basedir restriction by using a combination of symlink, mkdir, and unlink functions. last seen 2020-05-03 modified 2011-11-18 plugin id 17717 published 2011-11-18 reporter This script is Copyright (C) 2011-2020 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/17717 title PHP Symlink Function Race Condition open_basedir Bypass NASL family Mandriva Local Security Checks NASL id MANDRAKE_MDKSA-2006-185.NASL description PHP 4.x up to 4.4.4 and PHP 5 up to 5.1.6 allows local users to bypass certain Apache HTTP Server httpd.conf options, such as safe_mode and open_basedir, via the ini_restore function, which resets the values to their php.ini (Master Value) defaults. (CVE-2006-4625) A race condition in the symlink function in PHP 5.1.6 and earlier allows local users to bypass the open_basedir restriction by using a combination of symlink, mkdir, and unlink functions to change the file path after the open_basedir check and before the file is opened by the underlying system, as demonstrated by symlinking a symlink into a subdirectory, to point to a parent directory via .. (dot dot) sequences, and then unlinking the resulting symlink. (CVE-2006-5178) Because the design flaw cannot be solved it is strongly recommended to disable the symlink() function if you are using the open_basedir feature. You can achieve that by adding symlink to the list of disabled functions within your php.ini: disable_functions=...,symlink The updated packages do not alter the system php.ini. Updated packages have been patched to correct the CVE-2006-4625 issue. Users must restart Apache for the changes to take effect. last seen 2020-06-01 modified 2020-06-02 plugin id 24570 published 2007-02-18 reporter This script is Copyright (C) 2007-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/24570 title Mandrake Linux Security Advisory : php (MDKSA-2006:185)
Statements
contributor | Joshua Bressers |
lastmodified | 2006-12-04 |
organization | Red Hat |
statement | We do not consider these to be security issues. For more details see http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169857#c1 and http://www.php.net/security-note.php |
References
- http://lists.grok.org.uk/pipermail/full-disclosure/2006-October/049850.html
- http://secunia.com/advisories/22235
- http://secunia.com/advisories/22424
- http://securityreason.com/securityalert/1692
- http://securitytracker.com/id?1016977
- http://www.hardened-php.net/advisory_082006.132.html
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:185
- http://www.neosecurityteam.net/index.php?action=advisories&id=26
- http://www.securityfocus.com/archive/1/447649/100/0/threaded
- http://www.securityfocus.com/archive/1/448020/100/0/threaded
- http://www.securityfocus.com/archive/1/448953/100/0/threaded
- http://www.securityfocus.com/bid/20326
- http://www.turbolinux.com/security/2006/TLSA-2006-38.txt
- http://www.vupen.com/english/advisories/2006/3901
- https://exchange.xforce.ibmcloud.com/vulnerabilities/29340