CVE-2016-5768

Double free vulnerability in the _php_mb_regex_ereg_replace_exec function in php_mbregex.c in the mbstring extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by leveraging a callback exception.

php-mbstring _php_mb_regex_ereg_replace_exec() - double free (CVE-2016-5768).

php-mcrypt heap Overflow due to integer overflows (CVE-2016-5769).

php-SPL int/size_t confusion in SplFileObject::fread (CVE-2016-5770).

php-SPL Use After Free Vulnerability in PHP's GC algorithm and unserialize (CVE-2016-5771).

php-WDDX Double Free Courruption in wddx_deserialize (CVE-2016-5772).

php-zip ZipArchive class Use After Free Vulnerability in PHP's GC algorithm and unserialize (CVE-2016-5773).

The php package has been updated to version 5.6.23, fixing these issues and several other bugs. See the upstream ChangeLog for details.

This update for php5 fixes the following issues:

• It is possible to launch a web server with 'php -S localhost:8080' It used to be possible to set an arbitrary $HTTP_PROXY environment variable for request handlers -- like CGI scripts -- by including a specially crafted HTTP header in the request (CVE-2016-5385). As a result, these server components would potentially direct all their outgoing HTTP traffic through a malicious proxy server. This patch fixes the issue: the updated php server ignores such HTTP headers and never sets $HTTP_PROXY for sub-processes. (bnc#988486)
• There was multiple cases where a remote attacker could trigger a double free and, given specific PHP code using callbacks, trigger code execution vectors. (bnc#986246,bnc#986244,CVE-2016-5768,CVE-2016-5772)
• It was possible to inject header or content information (XSS) when a user was using internet explorer as the browser. (bnc#986004, CVE-2015-8935)
• In several cases it was possible for a integer overflow to trigger an excessive memory allocation (bnc#986392, bnc#986388, bnc#986386, bnc#986393, CVE-2016-5770, CVE-2016-5769, CVE-2016-5766, CVE-2016-5767)
• It was possible for an attacker to abuse the garbage collector to free a target array. At this point an attacker could craft a fake zval object and exploit the PHP process by taking over the EIP/RIP. (bnc#986391, CVE-2016-5771)

It was discovered that PHP incorrectly handled certain SplMinHeap::compare operations. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-4116)

It was discovered that PHP incorrectly handled recursive method calls. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-8873)

It was discovered that PHP incorrectly validated certain Exception objects when unserializing data. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-8876)

It was discovered that PHP header() function performed insufficient filtering for Internet Explorer. A remote attacker could possibly use this issue to perform a XSS attack. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-8935)

It was discovered that PHP incorrectly handled certain locale operations. An attacker could use this issue to cause PHP to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5093)

It was discovered that the PHP php_html_entities() function incorrectly handled certain string lengths. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5094, CVE-2016-5095)

It was discovered that the PHP fread() function incorrectly handled certain lengths. An attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5096)

It was discovered that the PHP FastCGI Process Manager (FPM) SAPI incorrectly handled memory in the access logging feature. An attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly expose sensitive information. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5114)

It was discovered that PHP would not protect applications from contents of the HTTP_PROXY environment variable when based on the contents of the Proxy header from HTTP requests. A remote attacker could possibly use this issue in combination with scripts that honour the HTTP_PROXY variable to redirect outgoing HTTP requests. (CVE-2016-5385)

Hans Jerry Illikainen discovered that the PHP bzread() function incorrectly performed error handling. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-5399)

It was discovered that certain PHP multibyte string functions incorrectly handled memory. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS. (CVE-2016-5768)

It was discovered that the PHP Mcrypt extension incorrectly handled memory. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-5769)

It was discovered that the PHP garbage collector incorrectly handled certain objects when unserializing malicious data. A remote attacker could use this issue to cause PHP to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue was only addressed in Ubuntu Ubuntu 14.04 LTS. (CVE-2016-5771, CVE-2016-5773)

It was discovered that PHP incorrectly handled memory when unserializing malicious xml data. A remote attacker could use this issue to cause PHP to crash, resulting in a…