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

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

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

The phpinfo() PHP function did not properly sanitize long strings. An attacker could use this to perform cross-site scripting attacks against sites that have publicly-available PHP scripts that call phpinfo(). (CVE-2006-0996)

The html_entity_decode() PHP function was found to not be binary safe.
An attacker could use this flaw to disclose a certain part of the memory. In order for this issue to be exploitable the target site would need to have a PHP script which called the 'html_entity_decode()' function with untrusted input from the user and displayed the result. (CVE-2006-1490)

The error handling output was found to not properly escape HTML output in certain cases. An attacker could use this flaw to perform cross-site scripting attacks against sites where both display_errors and html_errors are enabled. (CVE-2006-0208)

An input validation error was found in the 'mb_send_mail()' function.
An attacker could use this flaw to inject arbitrary headers in a mail sent via a script calling the 'mb_send_mail()' function where the 'To' parameter can be controlled by the attacker. (CVE-2005-3883)

A buffer overflow flaw was discovered in uw-imap, the University of Washington's IMAP Server. php-imap is compiled against the static c-client libraries from imap and therefore needed to be recompiled against the fixed version. This issue only affected Red Hat Enterprise Linux 3. (CVE-2005-2933).

Users of PHP should upgrade to these updated packages, which contain backported patches that resolve these issues.

The remote host is affected by the vulnerability described in GLSA-200605-08 (PHP: Multiple vulnerabilities)

    Several vulnerabilities were discovered on PHP4 and PHP5 by Infigo,     Tonu Samuel and Maksymilian Arciemowicz. These included a buffer     overflow in the wordwrap() function, restriction bypasses in the copy()     and tempname() functions, a cross-site scripting issue in the phpinfo()     function, a potential crash in the substr_compare() function and a     memory leak in the non-binary-safe html_entity_decode() function.
  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 point.

A vulnerability was discovered where the html_entity_decode() function would return a chunk of memory with length equal to the string supplied, which could include php code, php ini data, other user data, etc. Note that by default, Corporate 3.0 and Mandriva Linux LE2005 ship with magic_quotes_gpc on which seems to protect against this vulnerability 'out of the box' but users are encourages to upgrade regardless.

Once the upgraded packages have been installed, users will need to issue a 'service httpd restart' in order for the fixed packages to be properly loaded.

Updated packages have been patched to correct this issue.

The phpinfo() PHP function did not properly sanitize long strings. A remote attacker could use this to perform cross-site scripting attacks against sites that have publicly-available PHP scripts that call phpinfo(). Please note that it is not recommended to publicly expose phpinfo(). (CVE-2006-0996)

An information disclosure has been reported in the html_entity_decode() function. A script which uses this function to process arbitrary user-supplied input could be exploited to expose a random part of memory, which could potentially reveal sensitive data.
(CVE-2006-1490)

The wordwrap() function did not sufficiently check the validity of the 'break' argument. An attacker who could control the string passed to the 'break' parameter could cause a heap overflow; however, this should not happen in practical applications. (CVE-2006-1990)

The substr_compare() function did not sufficiently check the validity of the 'offset' argument. A script which passes untrusted user-defined values to this parameter could be exploited to crash the PHP interpreter. (CVE-2006-1991)

In certain situations, using unset() to delete a hash entry could cause the deletion of the wrong element, which would leave the specified variable defined. This could potentially cause information disclosure in security-relevant operations. (CVE-2006-3017)

In certain situations the session module attempted to close a data file twice, which led to memory corruption. This could potentially be exploited to crash the PHP interpreter, though that could not be verified. (CVE-2006-3018)

This update also fixes various bugs which allowed local scripts to bypass open_basedir and 'safe mode' restrictions by passing special arguments to tempnam() (CVE-2006-1494, CVE-2006-2660), copy() (CVE-2006-1608), the curl module (CVE-2006-2563), or error_log() (CVE-2006-3011).

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.

According to its banner, the version of PHP installed on the remote host is older than 4.4.3 / 5.1.4.  Such versions may be affected by several issues, including a buffer overflow, heap corruption, and a flaw by which a variable may survive a call to 'unset()'.

ID	Name	Product	Family	Published	Updated	Severity
21287	RHEL 3 / 4 : php (RHSA-2006:0276)	Nessus	Red Hat Local Security Checks	4/26/2006	1/14/2021	high
21350	GLSA-200605-08 : PHP: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	5/13/2006	1/6/2021	medium
21178	Mandrake Linux Security Advisory : php (MDKSA-2006:063)	Nessus	Mandriva Local Security Checks	4/4/2006	1/6/2021	medium
27897	Ubuntu 5.04 / 5.10 / 6.06 LTS : php4, php5 vulnerabilities (USN-320-1)	Nessus	Ubuntu Local Security Checks	11/10/2007	1/19/2021	high
21897	CentOS 3 / 4 : php (CESA-2006:0276)	Nessus	CentOS Local Security Checks	7/3/2006	1/4/2021	high
22268	PHP < 4.4.3 / 5.1.4 Multiple Vulnerabilities	Nessus	CGI abuses	8/25/2006	4/11/2022	high

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