imap_rfc822_parse_headers GS Violation

Upstream issue ---- https://bugs.php.net/bug.php?id=72968 Description ----- Exception when processing a long header string causes GS violation on Windows platform. ``` 0:000:x86> r;!exploitable -v eax=00000001 ebx=08a13020 ecx=00000007 edx=00000000 esi=00000003 edi=08a6116c eip=5221468b esp=0712e408 ebp=0712e418 iopl=0 nv up ei pl nz na po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000202 ucrtbase!abort+0x4b: 5221468b cd29 int 29h !exploitable 1.6.0.0 HostMachine\HostUser Executing Processor Architecture is x86 Debuggee is in User Mode Debuggee is a live user mode debugging session on the local machine Event Type: Exception *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\SysWOW64\KERNEL32.DLL - *** ERROR: Symbol file could not be found. Defaulted to export symbols for ntdll.dll - Exception Faulting Address: 0x5221468b Second Chance Exception Type: STATUS_STACK_BUFFER_OVERRUN (0xC0000409) Exception Hash (Major/Minor): 0x3eec876b.0x85eecc65 Hash Usage : Stack Trace: Major+Minor : ucrtbase!abort+0x4b Major+Minor : php_imap!rfc822_parse_msg_full+0x14 Major+Minor : php_imap!zif_imap_rfc822_parse_headers+0x62 Major+Minor : php7!execute_ex+0xfb Major+Minor : php7!zend_execute+0x124 Minor : php7!zend_execute_scripts+0xe7 Minor : php7!php_execute_script+0x372 Minor : php!do_cli+0x3d3 Minor : php!main+0x2cb Minor : php!__scrt_common_main_seh+0xf9 Minor : KERNEL32!BaseThreadInitThunk+0x24 Excluded : ntdll_776f0000!RtlInitializeExceptionChain+0x8f Excluded : ntdll_776f0000!RtlInitializeExceptionChain+0x5a Instruction Address: 0x000000005221468b Description: Stack Buffer Overrun (/GS Exception) Short Description: GSViolation Exploitability Classification: EXPLOITABLE Recommended Bug Title: Exploitable - Stack Buffer Overrun (/GS Exception) starting at ucrtbase!abort+0x000000000000004b (Hash=0x3eec876b.0x85eecc65) An overrun of a protected stack buffer has been detected. This is considered exploitable, and must be fixed. ``` Fixed in PHP 7.0.11 and PHP 5.6.26 --- https://gist.github.com/anonymous/39b697c75a0502e091a1191f83029034 http://php.net/ChangeLog-5.php http://php.net/ChangeLog-7.php