facebook hhvm 4.94.0 vulnerabilities and exploits

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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 ...

Facebook Hhvm Facebook Hhvm 4.94.0 Facebook Hhvm 4.95.0 Facebook Hhvm 4.96.0 Facebook Hhvm 4.97.0 Facebook Hhvm 4.98.0

In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions before 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.8...

Facebook Hhvm Facebook Hhvm 4.94.0 Facebook Hhvm 4.95.0 Facebook Hhvm 4.96.0 Facebook Hhvm 4.97.0 Facebook Hhvm 4.98.0

Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. This issue affects HHVM versions before 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, ...

Facebook Hhvm Facebook Hhvm 4.94.0 Facebook Hhvm 4.95.0 Facebook Hhvm 4.96.0 Facebook Hhvm 4.97.0 Facebook Hhvm 4.98.0

In the crypt function, we attempt to null terminate a buffer using the size of the input salt without validating that the offset is within the buffer. This issue affects HHVM versions before 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, a...

Facebook Hhvm Facebook Hhvm 4.94.0 Facebook Hhvm 4.95.0 Facebook Hhvm 4.96.0 Facebook Hhvm 4.97.0 Facebook Hhvm 4.98.0

2 Github repositories

Due to incorrect string size calculations inside the preg_quote function, a large input string passed to the function can trigger an integer overflow leading to a heap overflow. This issue affects HHVM versions before 4.56.3, all versions between 4.57.0 and 4.80.1, all versions b...

Facebook Hhvm Facebook Hhvm 4.94.0 Facebook Hhvm 4.95.0 Facebook Hhvm 4.96.0 Facebook Hhvm 4.97.0 Facebook Hhvm 4.98.0

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