Internet Bug Bounty · Report #675578

Out of Bounds Memory Read in exif_scan_thumbnail

Validstatus

highseverity

$1,500bounty

20upvotes

9 Nov 2020disclosed

How it was found

I have found and reported an out of bounds memory read in PHP [exif_scan_thumbnail] When PHP EXIF extension is parsing EXIF information from an image, e.g. via exif_read_data() function, in PHP versions 7.1.x below 7.1.31, 7.2.x below 7.2.21 and 7.3.x below 7.3.8 it is possible to supply it with data what will cause it to read past the allocated buffer. This has been fixed and assigned CVE-2019-11041 The bug report is here: https://bugs.php.net/bug.php?id=78222 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11041 https://nvd.nist.gov/vuln/detail/CVE-2019-11041

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