CVE-2020-1917

xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

We have discovered 255 live websites that are affected by CVE-2020-1917.

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Affected Software

Product	HHVM
Category	Web Servers
Vulnerable Domains	255 live websites (100% of HHVM install base)
Vulnerable Versions	from 0 through 4.56.3 from 4.94 through 4.94 from 4.95 through 4.95 from 4.96 through 4.96 from 4.97 through 4.97 from 4.98 through 4.98
Vulnerable Versions Count	20 versions ( 95% of all versions)