Buffer underflow in PHP before 5.2.1 allows attackers to cause a denial of service via unspecified vectors involving the sapi_header_op function.

From Red Hat Security Advisory 2007:0076 :

Updated PHP packages that fix several security issues are now available for Red Hat Enterprise Linux 3 and 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Web server.

A number of buffer overflow flaws were found in the PHP session extension, the str_replace() function, and the imap_mail_compose() function. If very long strings under the control of an attacker are passed to the str_replace() function then an integer overflow could occur in memory allocation. If a script uses the imap_mail_compose() function to create a new MIME message based on an input body from an untrusted source, it could result in a heap overflow. An attacker who is able to access a PHP application affected by any these issues could trigger these flaws and possibly execute arbitrary code as the 'apache' user. (CVE-2007-0906)

If unserializing untrusted data on 64-bit platforms, the zend_hash_init() function can be forced to enter an infinite loop, consuming CPU resources for a limited length of time, until the script timeout alarm aborts execution of the script. (CVE-2007-0988)

If the wddx extension is used to import WDDX data from an untrusted source, certain WDDX input packets may allow a random portion of heap memory to be exposed. (CVE-2007-0908)

If the odbc_result_all() function is used to display data from a database, and the contents of the database table are under the control of an attacker, a format string vulnerability is possible which could lead to the execution of arbitrary code. (CVE-2007-0909)

A one byte memory read will always occur before the beginning of a buffer, which could be triggered for example by any use of the header() function in a script. However it is unlikely that this would have any effect. (CVE-2007-0907)

Several flaws in PHP could allows attackers to 'clobber' certain super-global variables via unspecified vectors. (CVE-2007-0910)

Users of PHP should upgrade to these updated packages which contain backported patches to correct these issues.

Red Hat would like to thank Stefan Esser for his help diagnosing these issues.

This update fixes security problems also fixed in PHP 5.2.1, including following problems :

  - Multiple buffer overflows in PHP before 5.2.1 allow     attackers to cause a denial of service and possibly     execute arbitrary code via unspecified vectors in the     (1) session, (2) zip, (3) imap, and (4) sqlite     extensions; (5) stream filters; and the (6) str_replace,     (7) mail, (8) ibase_delete_user, (9) ibase_add_user, and     (10) ibase_modify_user functions. (CVE-2007-0906)

  - Buffer underflow in PHP before 5.2.1 allows attackers to     cause a denial of service via unspecified vectors     involving the sapi_header_op function. (CVE-2007-0907)

  - The wddx extension in PHP before 5.2.1 allows remote     attackers to obtain sensitive information via     unspecified vectors. (CVE-2007-0908)

  - Multiple format string vulnerabilities in PHP before     5.2.1 might allow attackers to execute arbitrary code     via format string specifiers to (1) all of the *print     functions on 64-bit systems, and (2) the odbc_result_all     function. (CVE-2007-0909)

  - Unspecified vulnerability in PHP before 5.2.1 allows     attackers to 'clobber' certain super-global variables     via unspecified vectors. (CVE-2007-0910)

  - Off-by-one error in the str_ireplace function in PHP     5.2.1 might allow context-dependent attackers to cause a     denial of service (crash). (CVE-2007-0911)

  - PHP 5.2.0 and 4.4 allows local users to bypass safe_mode     and open_basedir restrictions via a malicious path and a     null byte before a ';' in a session_save_path argument,     followed by an allowed path, which causes a parsing     inconsistency in which PHP validates the allowed path     but sets session.save_path to the malicious path. And     another fix for open_basedir was added to stop mixing up     its setting in a virtual host environment.
    (CVE-2006-6383)

USN-424-1 fixed vulnerabilities in PHP. However, some upstream changes were not included, which caused errors in the stream filters. This update fixes the problem.

We apologize for the inconvenience.

Multiple buffer overflows have been discovered in various PHP modules.
If a PHP application processes untrusted data with functions of the session or zip module, or various string functions, a remote attacker could exploit this to execute arbitrary code with the privileges of the web server. (CVE-2007-0906)

The sapi_header_op() function had a buffer underflow that could be exploited to crash the PHP interpreter.
(CVE-2007-0907)

The wddx unserialization handler did not correctly check for some buffer boundaries and had an uninitialized variable. By unserializing untrusted data, this could be exploited to expose memory regions that were not meant to be accessible.
Depending on the PHP application this could lead to disclosure of potentially sensitive information.
(CVE-2007-0908)

On 64 bit systems (the amd64 and sparc platforms), various print functions and the odbc_result_all() were susceptible to a format string vulnerability. A remote attacker could exploit this to execute arbitrary code with the privileges of the web server. (CVE-2007-0909)

Under certain circumstances it was possible to overwrite superglobal variables (like the HTTP GET/POST arrays) with crafted session data. (CVE-2007-0910)

When unserializing untrusted data on 64-bit platforms the zend_hash_init() function could be forced to enter an infinite loop, consuming CPU resources, for a limited length of time, until the script timeout alarm aborts the script.
(CVE-2007-0988).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple buffer overflows have been discovered in various PHP modules.
If a PHP application processes untrusted data with functions of the session or zip module, or various string functions, a remote attacker could exploit this to execute arbitrary code with the privileges of the web server. (CVE-2007-0906)

The sapi_header_op() function had a buffer underflow that could be exploited to crash the PHP interpreter. (CVE-2007-0907)

The wddx unserialization handler did not correctly check for some buffer boundaries and had an uninitialized variable. By unserializing untrusted data, this could be exploited to expose memory regions that were not meant to be accessible. Depending on the PHP application this could lead to disclosure of potentially sensitive information.
(CVE-2007-0908)

On 64 bit systems (the amd64 and sparc platforms), various print functions and the odbc_result_all() were susceptible to a format string vulnerability. A remote attacker could exploit this to execute arbitrary code with the privileges of the web server. (CVE-2007-0909)

Under certain circumstances it was possible to overwrite superglobal variables (like the HTTP GET/POST arrays) with crafted session data.
(CVE-2007-0910)

When unserializing untrusted data on 64-bit platforms the zend_hash_init() function could be forced to enter an infinite loop, consuming CPU resources, for a limited length of time, until the script timeout alarm aborts the script. (CVE-2007-0988).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

CVE-2007-0906: Multiple buffer overflows in PHP before 5.2.1 allow attackers to cause a denial of service and possibly execute arbitrary code via unspecified vectors in the (1) session, (2) zip, (3) imap, and (4) sqlite extensions; (5) stream filters; and the (6) str_replace, (7) mail, (8) ibase_delete_user, (9) ibase_add_user, and (10) ibase_modify_user functions.

CVE-2007-0907: Buffer underflow in PHP before 5.2.1 allows attackers to cause a denial of service via unspecified vectors involving the sapi_header_op function.

CVE-2007-0908: The wddx extension in PHP before 5.2.1 allows remote attackers to obtain sensitive information via unspecified vectors.

CVE-2007-0909: Multiple format string vulnerabilities in PHP before 5.2.1 might allow attackers to execute arbitrary code via format string specifiers to (1) all of the *print functions on 64-bit systems, and (2) the odbc_result_all function.

CVE-2007-0910: Unspecified vulnerability in PHP before 5.2.1 allows attackers to 'clobber' certain super-global variables via unspecified vectors.

CVE-2007-0911: Off-by-one error in the str_ireplace function in PHP 5.2.1 might allow context-dependent attackers to cause a denial of service (crash).

CVE-2006-6383: PHP 5.2.0 and 4.4 allows local users to bypass safe_mode and open_basedir restrictions via a malicious path and a null byte before a ';' in a session_save_path argument, followed by an allowed path, which causes a parsing inconsistency in which PHP validates the allowed path but sets session.save_path to the malicious path. And another fix for open_basedir was added to stop mixing up its setting in a virtual host environment.

Updated PHP packages that fix several security issues are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red Hat Security Response Team.

PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Web server.

A number of buffer overflow flaws were found in the PHP session extension; the str_replace() function; and the imap_mail_compose() function. If very long strings were passed to the str_replace() function, an integer overflow could occur in memory allocation. If a script used the imap_mail_compose() function to create a new MIME message based on an input body from an untrusted source, it could result in a heap overflow. An attacker with access to a PHP application affected by any these issues could trigger the flaws and possibly execute arbitrary code as the 'apache' user. (CVE-2007-0906)

When unserializing untrusted data on 64-bit platforms, the zend_hash_init() function could be forced into an infinite loop, consuming CPU resources for a limited time, until the script timeout alarm aborted execution of the script. (CVE-2007-0988)

If the wddx extension was used to import WDDX data from an untrusted source, certain WDDX input packets could expose a random portion of heap memory. (CVE-2007-0908)

If the odbc_result_all() function was used to display data from a database, and the database table contents were under an attacker's control, a format string vulnerability was possible which could allow arbitrary code execution. (CVE-2007-0909)

A one byte memory read always occurs before the beginning of a buffer.
This could be triggered, for example, by any use of the header() function in a script. However it is unlikely that this would have any effect. (CVE-2007-0907)

Several flaws in PHP could allow attackers to 'clobber' certain super-global variables via unspecified vectors. (CVE-2007-0910)

An input validation bug allowed a remote attacker to trigger a denial of service attack by submitting an input variable with a deeply-nested-array. (CVE-2007-1285)

Users of PHP should upgrade to these updated packages which contain backported patches to correct these issues.

According to its banner, the version of PHP installed on the remote host is older than 5.2.1.  Such versions may be affected by several issues, including buffer overflows, format string vulnerabilities, arbitrary code execution, 'safe_mode' and 'open_basedir' bypasses, and clobbering of super-globals.

According to its banner, the version of PHP installed on the remote host is older than 4.4.5.  Such versions may be affected by several issues, including buffer overflows, format string vulnerabilities, arbitrary code execution, 'safe_mode' and 'open_basedir' bypasses, and clobbering of super-globals.

The remote host is affected by the vulnerability described in GLSA-200703-21 (PHP: Multiple vulnerabilities)

    Several vulnerabilities were found in PHP by the Hardened-PHP Project     and other researchers. These vulnerabilities include a heap-based     buffer overflow in htmlentities() and htmlspecialchars() if called with     UTF-8 parameters, and an off-by-one error in str_ireplace(). Other     vulnerabilities were also found in the PHP4 branch, including possible     overflows, stack corruptions and a format string vulnerability in the
    *print() functions on 64 bit systems.
  Impact :

    Remote attackers might be able to exploit these issues in PHP     applications making use of the affected functions, potentially     resulting in the execution of arbitrary code, Denial of Service,     execution of scripted contents in the context of the affected site,     security bypass or information leak.
  Workaround :

    There is no known workaround at this time.

Several remote vulnerabilities have been discovered in PHP, a server-side, HTML-embedded scripting language, which may lead to the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2007-0906     It was discovered that an integer overflow in the     str_replace() function could lead to the execution of     arbitrary code.

  - CVE-2007-0907     It was discovered that a buffer underflow in the     sapi_header_op() function could crash the PHP     interpreter.

  - CVE-2007-0908     Stefan Esser discovered that a programming error in the     wddx extension allows information disclosure.

  - CVE-2007-0909     It was discovered that a format string vulnerability in     the odbc_result_all() functions allows the execution of     arbitrary code.

  - CVE-2007-0910     It was discovered that super-global variables could be     overwritten with session data.

  - CVE-2007-0988     Stefan Esser discovered that the zend_hash_init()     function could be tricked into an endless loop, allowing     denial of service through resource consumption until a     timeout is triggered.

Updated PHP packages that fix several security issues are now available for Red Hat Enterprise Linux 2.1.

This update has been rated as having important security impact by the Red Hat Security Response Team.

PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Web server.

A number of buffer overflow flaws were found in the PHP session extension; the str_replace() function; and the imap_mail_compose() function. If very long strings were passed to the str_replace() function, an integer overflow could occur in memory allocation. If a script used the imap_mail_compose() function to create a new MIME message based on an input body from an untrusted source, it could result in a heap overflow. An attacker with access to a PHP application affected by any these issues could trigger the flaws and possibly execute arbitrary code as the 'apache' user. (CVE-2007-0906)

When unserializing untrusted data on 64-bit platforms, the zend_hash_init() function could be forced into an infinite loop, consuming CPU resources for a limited time, until the script timeout alarm aborted execution of the script. (CVE-2007-0988)

If the wddx extension was used to import WDDX data from an untrusted source, certain WDDX input packets could expose a random portion of heap memory. (CVE-2007-0908)

If the odbc_result_all() function was used to display data from a database, and the database table contents were under an attacker's control, a format string vulnerability was possible which could allow arbitrary code execution. (CVE-2007-0909)

A one byte memory read always occurs before the beginning of a buffer.
This could be triggered, for example, by any use of the header() function in a script. However it is unlikely that this would have any effect. (CVE-2007-0907)

Several flaws in PHP could allow attackers to 'clobber' certain super-global variables via unspecified vectors. (CVE-2007-0910)

Users of PHP should upgrade to these updated packages which contain backported patches to correct these issues.

Red Hat would like to thank Stefan Esser for his help diagnosing these issues.

A number of vulnerabilities were discovered in PHP language.

Many buffer overflow flaws were discovered in the PHP session extension, the str_replace() function, and the imap_mail_compose() function. An attacker able to use a PHP application using any of these functions could trigger these flaws and possibly execute arbitrary code as the apache user (CVE-2007-0906).

A one-byte memory read will always occur prior to the beginning of a buffer, which could be triggered, for example, by any use of the header() function in a script (CVE-2007-0907).

The wddx extension, if used to import WDDX data from an untrusted source, may allow a random portion of heap memory to be exposed due to certain WDDX input packets (CVE-2007-0908).

The odbc_result_all() function, if used to display data from a database, and if the contents of the database are under the control of an attacker, could lead to the execution of arbitrary code due to a format string vulnerability (CVE-2007-0909).

Several flaws in the PHP could allow attackers to clobber certain super-global variables via unspecified vectors (CVE-2007-0910).

The zend_hash_init() function can be forced into an infinite loop if unserializing untrusted data on a 64-bit platform, resulting in the consumption of CPU resources until the script timeout alarm aborts the execution of the script (CVE-2007-0988).

Updated package have been patched to correct this issue.

New php packages are available for Slackware 10.2 and 11.0 to improve the stability and security of PHP. Quite a few bugs were fixed -- please see http://www.php.net for a detailed list. All sites that use PHP are encouraged to upgrade. Please note that we haven't tested all PHP applications for backwards compatibility with this new upgrade, so you should have the old package on hand just in case. Both PHP 4.4.5 and PHP 5.2.1 updates have been provided. Some of these issues have been assigned CVE numbers and may be referenced in the Common Vulnerabilities and Exposures (CVE) database:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0906 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0907 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0908 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0909 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0910 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0988

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2007:0076 advisory.

  - security flaw (CVE-2007-0906, CVE-2007-0907, CVE-2007-0908, CVE-2007-0909, CVE-2007-0910, CVE-2007-0988)

  - php session extension information leak (CVE-2007-1380)

  - php session extension global variable clobber (CVE-2007-1701)

  - php imap_mail_compose() buffer overflow via type.parameters (CVE-2007-1825)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Updated PHP packages that fix several security issues are now available for Red Hat Enterprise Linux 3 and 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

PHP is an HTML-embedded scripting language commonly used with the Apache HTTP Web server.

A number of buffer overflow flaws were found in the PHP session extension, the str_replace() function, and the imap_mail_compose() function. If very long strings under the control of an attacker are passed to the str_replace() function then an integer overflow could occur in memory allocation. If a script uses the imap_mail_compose() function to create a new MIME message based on an input body from an untrusted source, it could result in a heap overflow. An attacker who is able to access a PHP application affected by any these issues could trigger these flaws and possibly execute arbitrary code as the 'apache' user. (CVE-2007-0906)

If unserializing untrusted data on 64-bit platforms, the zend_hash_init() function can be forced to enter an infinite loop, consuming CPU resources for a limited length of time, until the script timeout alarm aborts execution of the script. (CVE-2007-0988)

If the wddx extension is used to import WDDX data from an untrusted source, certain WDDX input packets may allow a random portion of heap memory to be exposed. (CVE-2007-0908)

If the odbc_result_all() function is used to display data from a database, and the contents of the database table are under the control of an attacker, a format string vulnerability is possible which could lead to the execution of arbitrary code. (CVE-2007-0909)

A one byte memory read will always occur before the beginning of a buffer, which could be triggered for example by any use of the header() function in a script. However it is unlikely that this would have any effect. (CVE-2007-0907)

Several flaws in PHP could allows attackers to 'clobber' certain super-global variables via unspecified vectors. (CVE-2007-0910)

Users of PHP should upgrade to these updated packages which contain backported patches to correct these issues.

Red Hat would like to thank Stefan Esser for his help diagnosing these issues.

Multiple vulnerabilities have been found in PHP, including : buffer overflows, stack overflows, format string, and information disclosure vulnerabilities.

The session extension contained safe_mode and open_basedir bypasses, but the FreeBSD Security Officer does not consider these real security vulnerabilities, since safe_mode and open_basedir are insecure by design and should not be relied upon.

The remote host is running PHP less than 5.2.0.  This version is vulnerable to around 180 bugs.  An attacker exploiting these flaws would be able to impact confidentiality, integrity, and availability. 

ID	Name	Product	Family	Severity
67451	Oracle Linux 3 / 4 : php (ELSA-2007-0076)	Nessus	Oracle Linux Local Security Checks	critical
29377	SuSE 10 Security Update : PHP5 (ZYPP Patch Number 2684)	Nessus	SuSE Local Security Checks	critical
28017	Ubuntu 5.10 / 6.06 LTS / 6.10 : php5 regression (USN-424-2)	Nessus	Ubuntu Local Security Checks	critical
28016	Ubuntu 5.10 / 6.06 LTS / 6.10 : php5 vulnerabilities (USN-424-1)	Nessus	Ubuntu Local Security Checks	critical
27390	openSUSE 10 Security Update : php5 (php5-2687)	Nessus	SuSE Local Security Checks	critical
25317	RHEL 5 : php (RHSA-2007:0082)	Nessus	Red Hat Local Security Checks	critical
24907	PHP < 5.2.1 Multiple Vulnerabilities	Nessus	CGI abuses	high
24906	PHP < 4.4.5 Multiple Vulnerabilities	Nessus	CGI abuses	high
24887	GLSA-200703-21 : PHP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
24793	Debian DSA-1264-1 : php4 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
24697	RHEL 2.1 : php (RHSA-2007:0081)	Nessus	Red Hat Local Security Checks	critical
24695	Mandrake Linux Security Advisory : php (MDKSA-2007:048)	Nessus	Mandriva Local Security Checks	critical
24691	Slackware 10.2 / 11.0 : php (SSA:2007-053-01)	Nessus	Slackware Local Security Checks	critical
24677	RHEL 4 : php (RHSA-2007:0076)	Nessus	Red Hat Local Security Checks	critical
24673	CentOS 3 / 4 : php (CESA-2007:0076)	Nessus	CentOS Local Security Checks	critical
24365	FreeBSD : php -- multiple vulnerabilities (7fcf1727-be71-11db-b2ec-000c6ec775d9)	Nessus	FreeBSD Local Security Checks	critical
3857	PHP < 4.4.5 / 5.2.1 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	medium
801112	PHP < 4.4.5 / 5.2.1 Multiple Vulnerabilities	Log Correlation Engine	Web Servers	high

Detections

Analytics

CVE-2007-0907

high

Tenable Plugins

critical

critical

critical

critical

critical

critical

high

high

critical

critical

critical

critical

critical

critical

critical

critical

medium

high