The Linear Congruential Generator (LCG) in PHP before 5.2.13 does not provide the expected entropy, which makes it easier for context-dependent attackers to guess values that were intended to be unpredictable, as demonstrated by session cookies generated by using the uniqid function.

From Red Hat Security Advisory 2010:0919 :

Updated php packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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

An input validation flaw was discovered in the PHP session serializer.
If a PHP script generated session variable names from untrusted user input, a remote attacker could use this flaw to inject an arbitrary variable into the PHP session. (CVE-2010-3065)

An information leak flaw was discovered in the PHP var_export() function implementation. If some fatal error occurred during the execution of this function (such as the exhaustion of memory or script execution time limit), part of the function's output was sent to the user as script output, possibly leading to the disclosure of sensitive information. (CVE-2010-2531)

A numeric truncation error and an input validation flaw were found in the way the PHP utf8_decode() function decoded partial multi-byte sequences for some multi-byte encodings, sending them to output without them being escaped. An attacker could use these flaws to perform a cross-site scripting attack. (CVE-2009-5016, CVE-2010-3870)

It was discovered that the PHP lcg_value() function used insufficient entropy to seed the pseudo-random number generator. A remote attacker could possibly use this flaw to predict values returned by the function, which are used to generate session identifiers by default.
This update changes the function's implementation to use more entropy during seeding. (CVE-2010-1128)

It was discovered that the PHP fnmatch() function did not restrict the length of the pattern argument. A remote attacker could use this flaw to crash the PHP interpreter where a script used fnmatch() on untrusted matching patterns. (CVE-2010-1917)

A NULL pointer dereference flaw was discovered in the PHP XML-RPC extension. A malicious XML-RPC client or server could use this flaw to crash the PHP interpreter via a specially crafted XML-RPC request.
(CVE-2010-0397)

All php users should upgrade to these updated packages, which contain backported patches to resolve these issues. After installing the updated packages, the httpd daemon must be restarted for the update to take effect.

An input validation flaw was discovered in the PHP session serializer.
If a PHP script generated session variable names from untrusted user input, a remote attacker could use this flaw to inject an arbitrary variable into the PHP session. (CVE-2010-3065)

An information leak flaw was discovered in the PHP var_export() function implementation. If some fatal error occurred during the execution of this function (such as the exhaustion of memory or script execution time limit), part of the function's output was sent to the user as script output, possibly leading to the disclosure of sensitive information. (CVE-2010-2531)

A numeric truncation error and an input validation flaw were found in the way the PHP utf8_decode() function decoded partial multi-byte sequences for some multi-byte encodings, sending them to output without them being escaped. An attacker could use these flaws to perform a cross-site scripting attack. (CVE-2009-5016, CVE-2010-3870)

It was discovered that the PHP lcg_value() function used insufficient entropy to seed the pseudo-random number generator. A remote attacker could possibly use this flaw to predict values returned by the function, which are used to generate session identifiers by default.
This update changes the function's implementation to use more entropy during seeding. (CVE-2010-1128)

It was discovered that the PHP fnmatch() function did not restrict the length of the pattern argument. A remote attacker could use this flaw to crash the PHP interpreter where a script used fnmatch() on untrusted matching patterns. (CVE-2010-1917)

A NULL pointer dereference flaw was discovered in the PHP XML-RPC extension. A malicious XML-RPC client or server could use this flaw to crash the PHP interpreter via a specially crafted XML-RPC request.
(CVE-2010-0397)

After installing the updated packages, the httpd daemon must be restarted for the update to take effect.

The remote host is affected by the vulnerability described in GLSA-201110-06 (PHP: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in PHP. Please review the       CVE identifiers referenced below for details.
  Impact :

    A context-dependent attacker could execute arbitrary code, obtain       sensitive information from process memory, bypass intended access       restrictions, or cause a Denial of Service in various ways.
    A remote attacker could cause a Denial of Service in various ways,       bypass spam detections, or bypass open_basedir restrictions.
  Workaround :

    There is no known workaround at this time.

Updated php packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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

An input validation flaw was discovered in the PHP session serializer.
If a PHP script generated session variable names from untrusted user input, a remote attacker could use this flaw to inject an arbitrary variable into the PHP session. (CVE-2010-3065)

An information leak flaw was discovered in the PHP var_export() function implementation. If some fatal error occurred during the execution of this function (such as the exhaustion of memory or script execution time limit), part of the function's output was sent to the user as script output, possibly leading to the disclosure of sensitive information. (CVE-2010-2531)

A numeric truncation error and an input validation flaw were found in the way the PHP utf8_decode() function decoded partial multi-byte sequences for some multi-byte encodings, sending them to output without them being escaped. An attacker could use these flaws to perform a cross-site scripting attack. (CVE-2009-5016, CVE-2010-3870)

It was discovered that the PHP lcg_value() function used insufficient entropy to seed the pseudo-random number generator. A remote attacker could possibly use this flaw to predict values returned by the function, which are used to generate session identifiers by default.
This update changes the function's implementation to use more entropy during seeding. (CVE-2010-1128)

It was discovered that the PHP fnmatch() function did not restrict the length of the pattern argument. A remote attacker could use this flaw to crash the PHP interpreter where a script used fnmatch() on untrusted matching patterns. (CVE-2010-1917)

A NULL pointer dereference flaw was discovered in the PHP XML-RPC extension. A malicious XML-RPC client or server could use this flaw to crash the PHP interpreter via a specially crafted XML-RPC request.
(CVE-2010-0397)

All php users should upgrade to these updated packages, which contain backported patches to resolve these issues. After installing the updated packages, the httpd daemon must be restarted for the update to take effect.

Auke van Slooten discovered that PHP incorrectly handled certain xmlrpc requests. An attacker could exploit this issue to cause the PHP server to crash, resulting in a denial of service. This issue only affected Ubuntu 6.06 LTS, 8.04 LTS, 9.04 and 9.10. (CVE-2010-0397)

It was discovered that the pseudorandom number generator in PHP did not provide the expected entropy. An attacker could exploit this issue to predict values that were intended to be random, such as session cookies. This issue only affected Ubuntu 6.06 LTS, 8.04 LTS, 9.04 and 9.10. (CVE-2010-1128)

It was discovered that PHP did not properly handle directory pathnames that lacked a trailing slash character. An attacker could exploit this issue to bypass safe_mode restrictions. This issue only affected Ubuntu 6.06 LTS, 8.04 LTS, 9.04 and 9.10. (CVE-2010-1129)

Grzegorz Stachowiak discovered that the PHP session extension did not properly handle semicolon characters. An attacker could exploit this issue to bypass safe_mode restrictions. This issue only affected Ubuntu 8.04 LTS, 9.04 and 9.10. (CVE-2010-1130)

Stefan Esser discovered that PHP incorrectly decoded remote HTTP chunked encoding streams. An attacker could exploit this issue to cause the PHP server to crash and possibly execute arbitrary code with application privileges. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-1866)

Mateusz Kocielski discovered that certain PHP SQLite functions incorrectly handled empty SQL queries. An attacker could exploit this issue to possibly execute arbitrary code with application privileges.
(CVE-2010-1868)

Mateusz Kocielski discovered that PHP incorrectly handled certain arguments to the fnmatch function. An attacker could exploit this flaw and cause the PHP server to consume all available stack memory, resulting in a denial of service. (CVE-2010-1917)

Stefan Esser discovered that PHP incorrectly handled certain strings in the phar extension. An attacker could exploit this flaw to possibly view sensitive information. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-2094, CVE-2010-2950)

Stefan Esser discovered that PHP incorrectly handled deserialization of SPLObjectStorage objects. A remote attacker could exploit this issue to view sensitive information and possibly execute arbitrary code with application privileges. This issue only affected Ubuntu 8.04 LTS, 9.04, 9.10 and 10.04 LTS. (CVE-2010-2225)

It was discovered that PHP incorrectly filtered error messages when limits for memory, execution time, or recursion were exceeded. A remote attacker could exploit this issue to possibly view sensitive information. (CVE-2010-2531)

Stefan Esser discovered that the PHP session serializer incorrectly handled the PS_UNDEF_MARKER marker. An attacker could exploit this issue to alter arbitrary session variables. (CVE-2010-3065).

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 vulnerabilities has been found and corrected in php :

  - Improved LCG entropy. (Rasmus, Samy Kamkar)     (CVE-2010-1128)

    - Fixed safe_mode validation inside tempnam() when the       directory path does not end with a /). (Martin Jansen)       (CVE-2010-1129)

  - Fixed a possible open_basedir/safe_mode bypass in the     session extension identified by Grzegorz Stachowiak.
    (Ilia) (CVE-2010-1130)

Packages for 2008.0 are provided for Corporate Desktop 2008.0 customers.

The updated packages have been patched to correct these issues.

According to its banner, the version of PHP installed on the remote host is earlier than 5.3.2 / 5.2.13.  Such versions are potentially affected by multiple vulnerabilities : 

  - A safe_mode validation issue inside 'tempnam()' when the directory path does not end with a '/'.

  - A possible open_basedir/safe_mode bypass in the session extension.

According to its banner, the version of PHP installed on the remote host is older than 5.3.2 / 5.2.13.  Such versions may be affected by several security issues :

  - Directory paths not ending with '/' may not be     correctly validated inside 'tempnam()' in     'safe_mode' configuration.

  - It may be possible to bypass the 'open_basedir'/     'safe_mode' configuration restrictions due to an     error in session extensions.

  - An unspecified vulnerability affects the LCG entropy.

According to its banner, the version of PHP 5.3.x installed on the remote host is earlier than 5.3.1.  Such versions are potentially affected by multiple issues : 

  - Sanity checks are missing in exif processing.

  - It is possible to bypass the 'safe_mode' configuration setting using 'tempnam()'.

  - It is possible to bypass the 'open_basedir' configuration setting using 'posix_mkfifo()'.

  - The 'safe_mode_include_dir' configuration setting may be ignored.

  - Calling 'popen()' with an invalid mode can cause a crash.

  - A safe_mode restriction-bypass vulnerability because environment variables specified for 'proc_open' are passed without checking them.

According to its banner, the version of PHP 5.3 installed on the remote host is older than 5.3.1.  Such versions may be affected by several security issues :

  - Sanity checks are missing in exif processing.

  - It is possible to bypass the 'safe_mode' configuration     setting using 'tempnam()'.

  - It is possible to bypass the 'open_basedir'     configuration setting using 'posix_mkfifo()'.

  - The 'safe_mode_include_dir' configuration setting may     be ignored. (Bug #50063)

  - Calling 'popen()' with an invalid mode can cause a     crash under Windows. (Bug #44683)

  - Provided file uploading is enabled (it is by default),     an attacker can upload files using a POST request with     'multipart/form-data' content even if the target script     doesn't actually support file uploads per se. By     supplying a large number (15,000+) of files, an attacker     could cause the web server to stop responding while it     processes the file list.

  - 'proc_open()' can bypass 'safe_mode_protected_env_vars'.
    (Bug #49026)

  - An unspecified vulnerability affects the LCG entropy.

ID	Name	Product	Family	Severity
68150	Oracle Linux 4 / 5 : php (ELSA-2010-0919)	Nessus	Oracle Linux Local Security Checks	medium
60908	Scientific Linux Security Update : php on SL4.x, SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
56459	GLSA-201110-06 : PHP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
50862	CentOS 4 / 5 : php (CESA-2010:0919)	Nessus	CentOS Local Security Checks	medium
50841	RHEL 4 / 5 : php (RHSA-2010:0919)	Nessus	Red Hat Local Security Checks	medium
49306	Ubuntu 6.06 LTS / 8.04 LTS / 9.04 / 9.10 / 10.04 LTS : php5 vulnerabilities (USN-989-1)	Nessus	Ubuntu Local Security Checks	high
45029	Mandriva Linux Security Advisory : php (MDVSA-2010:058)	Nessus	Mandriva Local Security Checks	high
801102	PHP < 5.3.2 / 5.2.13 Multiple Vulnerabilities	Log Correlation Engine	Web Servers	medium
5346	PHP < 5.2.13 / 5.3.x < 5.3.2 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	high
44921	PHP < 5.3.2 / 5.2.13 Multiple Vulnerabilities	Nessus	CGI abuses	medium
5242	PHP 5.3.x < 5.3.1 Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	high
42862	PHP 5.3 < 5.3.1 Multiple Vulnerabilities	Nessus	CGI abuses	medium

Detections

Analytics

CVE-2010-1128

high

Tenable Plugins

medium

medium

critical

medium

medium

high

high

medium

high

medium

high

medium