PHP 5.6.x < 5.6.9 Multiple Vulnerabilities

Versions of PHP 5.6.x earlier than 5.6.9 are exposed to the following issues :

• Multiple flaws exist related to using pathnames containing NULL bytes. A remote attacker can exploit these flaws, by combining the ‘\0’ character with a safe file extension, to bypass access restrictions. This had been previously fixed but was reintroduced by a regression in versions 5.4+. (CVE-2006-7243, CVE-2015-4025)

• A flaw exists in the phar_parse_tarfile() function in ‘ext/phar/tar.c’ that is triggered when handling zero-length filenames. This may allow an attacker to corrupt memory, crashing an application or potentially allowing code execution. (CVE-2015-4021)

• An integer overflow condition exists in the ftp_genlist() function in ‘ftp.c’ due to improper validation of user-supplied input. A remote attacker can exploit this to cause a heap-based buffer overflow, resulting in a denial of service condition or possible remote code execution. (CVE-2015-4022)

• A flaw exists in the multipart_buffer_headers() function in ‘rfc1867.c’ due to improper handling of multipart/form-data in HTTP requests. A remote attacker can exploit this flaw to cause a consumption of CPU resources, resulting in a denial of service condition. (CVE-2015-4024)

• A security bypass vulnerability exists due to a flaw in the ‘pcntl_exec’ implementation that truncates a pathname upon encountering the ‘\x00’ character. A remote attacker can exploit this, via a crafted first argument, to bypass intended extension restrictions and execute arbitrary files. (CVE-2015-4026)

• The PCRE library contains an overflow condition in the functions ‘pcre_compile2()’ and ‘compile_branch()’. These issues are triggered as user-supplied input is not properly validated when handling regex. This may allow a context-dependent attacker to cause a heap-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code. (CVE-2015-2325, CVE-2015-2326)

• An integer overflow condition exists in the function str_repeat(). The issue is triggered due to a sign mismatch condition. This may allow a context-dependent attacker to create corrupted ZVALs, leading to memory corruption. This may result in a denial of service or potentially the execution of arbitrary code.

• An overflow condition affects the unpack() function in ‘ext/standard/pack.c’. The issue is triggered as user-supplied input passed via the ‘format’ parameter is not properly validated. This may allow a context-dependent attacker to cause a heap-based buffer overflow, resulting in a denial of service or potentially allowing the execution of arbitrary code.

• An unspecified flaw exists in the zend_std_get_method() function in ‘Zend/zend_compile.c’ that may allow an attacker to trigger an invalid read. No further details have been provided by the vendor.