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Bug #79046 NaN to int cast undefined behavior in exif
Submitted: 2019-12-30 03:37 UTC Modified: 2019-12-30 15:29 UTC
From: wxhusst at gmail dot com Assigned:
Status: Closed Package: EXIF related
PHP Version: 7.4.1 OS: linux
Private report: No CVE-ID: None
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 [2019-12-30 03:37 UTC] wxhusst at gmail dot com 
Description:
------------
exif_read_data may lead to integer overflow

raven@ubuntu ~/p/s/cli (master)> 
./php -r 'exif_read_data("/home/raven/php-src/crash-7cd841466926b2ce76d75b379568282a0fc8914b", "IFD0");'
/home/raven/php-src/ext/exif/exif.c:1677:10: runtime error: nan is outside the range of representable values of type 'unsigned long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/raven/php-src/ext/exif/exif.c:1677:10 in

sorry,  no backtrace for gdb

the file 
https://github.com/loveraven42/poc/blob/master/crash-7cd841466926b2ce76d75b379568282a0fc8914b

Test script:
---------------
./php -r 'exif_read_data("/home/raven/php-src/crash-7cd841466926b2ce76d75b379568282a0fc8914b", "IFD0");

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 [2019-12-30 15:29 UTC] nikic@php.net
-Summary: UndefinedBehaviorSanitizer: undefined-behavior +Summary: NaN to int cast undefined behavior in exif -Status: Open +Status: Verified -Type: Security +Type: Bug
 [2019-12-30 15:29 UTC] nikic@php.net 
This was partially addressed in https://github.com/php/php-src/commit/dd997a40d0be9b03973b1317041f92ad9582237f, but the NaN case wasn't handled.

Reclassifying as normal bug as this UBSan violation does not result in an actual miscompile.
 [2019-12-30 16:24 UTC] nikic@php.net 
Automatic comment on behalf of nikita.ppv@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=d1537e506edb48790c72a93e1d8505ef2c3e4dd3
Log: Fixed bug #79046
 [2019-12-30 16:24 UTC] nikic@php.net
-Status: Verified +Status: Closed
 
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