PHP 5.6.x < 5.6.11 Multiple Vulnerabilities (BACKRONYM)

Critical Web Application Scanning Plugin ID 98803

Synopsis

PHP 5.6.x < 5.6.11 Multiple Vulnerabilities (BACKRONYM)

Description

According to its banner, the version of PHP 5.6.x running on the remote web server is prior to 5.6.11. It is, therefore, affected by multiple vulnerabilities :

- A security feature bypass vulnerability, known as 'BACKRONYM', exists due to a failure to properly enforce the requirement of an SSL/TLS connection when the --ssl client option is used. A man-in-the-middle attacker can exploit this flaw to coerce the client to downgrade to an unencrypted
connection, allowing the attacker to disclose data from the database or manipulate database queries. (CVE-2015-3152)

- A flaw exists in the PHP Connector/C component due to a failure to properly enforce the requirement of an SSL/TLS connection when the --ssl client option is used. A man-in-the-middle attacker can exploit this to downgrade the connection to plain HTTP when HTTPS is expected. (CVE-2015-8838) -
A use-after-free error exists in the spl_recursive_it_move_forward_ex() function. An attacker can exploit this to dereference already freed memory, potentially allowing the execution of arbitrary code.

- A use-after-free error exists in the sqlite3SafetyCheckSickOrOk() function. An attacker can exploit this to dereference already freed memory, potentially allowing the execution of arbitrary code.

- The '!' character is not treated as a special character when delayed variable substitution is enabled. The functions escapeshellcmd() and escapeshellarg() are unable to properly sanitize arguments containing '!'. An attacker can exploit this to execute arbitrary commands.

- A double-free flaw exists in zend_vm_execute.h due to improper handling of certain code. An attacker can exploit this flaw to crash a PHP application, resulting in a denial of service condition.

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

Solution

Upgrade to PHP version 5.6.11 or later.

See Also

http://php.net/ChangeLog-5.php#5.6.11

http://backronym.fail/

Plugin Details

Severity: Critical

ID: 98803

Type: remote

Published: 2019/01/09

Updated: 2019/04/10

Risk Information

Risk Factor: Critical

CVSS v2.0

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

Exploit Available: true

Patch Publication Date: 2015/07/10

Vulnerability Publication Date: 2013/12/03

Reference Information

CVE: CVE-2015-5589, CVE-2015-5590, CVE-2015-3152, CVE-2015-8838

BID: 74398

CWE: 284

WASC: Insufficient Authorization

OWASP: 2010-A4, 2010-A8, 2013-A4, 2013-A7, 2013-A9, 2017-A5, 2017-A9