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CVE-2020-1900 When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property…

Description

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This pre-reservation was not occurring in HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.

Affected products and versions

Product Affected versions Fixed in
HHVM 4.62.0 4.62.1
HHVM 4.61.0 4.61.1
HHVM 4.60.0 4.60.1
HHVM 4.59.0 4.59.1
HHVM 4.58 4.58.0 → < 4.58.2 4.58.2
HHVM 4.57.0 4.57.1
HHVM 4.56 earliest → < 4.56.1 4.56.1
HHVM 4.33 4.33.0 → latest No fix stated
HHVM 4.32 earliest → < 4.32.3 4.32.3

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