CVE-2020-1900
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Facebook Hhvm
PublishedMar 11, 2021
First seenMar 11, 2021
Weakness typeCWE-416Use after free
How to fix
Update
- facebook hhvm4.32.3, 4.56.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| facebook hhvm | v < 4.32.3, 4.33.0 ≤ v < 4.56.1, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0 | 4.32.3, 4.56.1 |
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