What is CVE-2020-1900?

CVE-2020-1900 is a vulnerability in Facebook HHVM that allows an attacker to resize the dynamic property array, potentially invalidating previously stored references.

How does CVE-2020-1900 impact HHVM?

CVE-2020-1900 affects HHVM versions prior to v4.32.3, and from v4.33.0 to v4.56.1. It does not affect HHVM versions v4.57.0 and above.

What is the severity of CVE-2020-1900?

CVE-2020-1900 has a severity rating of 9.8, which is considered critical.

How can I fix CVE-2020-1900?

To fix CVE-2020-1900, update your HHVM installation to version v4.32.3 or higher if you are using a vulnerable version.

Where can I find more information about CVE-2020-1900?

More information about CVE-2020-1900 can be found in the official security update blog post by HHVM (https://hhvm.com/blog/2020/06/30/security-update.html) and in the GitHub commit (https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3).

Vulnerability/
CVE-2020-1900

critical

9.8

CWE

416

11/3/2021

4/8/2024

CVE-2020-1900: Use After Free

First published: Thu Mar 11 2021(Updated: )

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.

Credit: cve-assign@fb.com

Affected Software	Affected Version	How to fix
Facebook HHVM	<4.32.3
Facebook HHVM	>=4.33.0<4.56.1
Facebook HHVM	=4.57.0
Facebook HHVM	=4.58.0
Facebook HHVM	=4.58.1
Facebook HHVM	=4.59.0
Facebook HHVM	=4.60.0
Facebook HHVM	=4.61.0
Facebook HHVM	=4.62.0

Remedy

https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2020-1900?
CVE-2020-1900 is a vulnerability in Facebook HHVM that allows an attacker to resize the dynamic property array, potentially invalidating previously stored references.
How does CVE-2020-1900 impact HHVM?
CVE-2020-1900 affects HHVM versions prior to v4.32.3, and from v4.33.0 to v4.56.1. It does not affect HHVM versions v4.57.0 and above.
What is the severity of CVE-2020-1900?
CVE-2020-1900 has a severity rating of 9.8, which is considered critical.
How can I fix CVE-2020-1900?
To fix CVE-2020-1900, update your HHVM installation to version v4.32.3 or higher if you are using a vulnerable version.
Where can I find more information about CVE-2020-1900?
More information about CVE-2020-1900 can be found in the official security update blog post by HHVM (https://hhvm.com/blog/2020/06/30/security-update.html) and in the GitHub commit (https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3).

collector/nvd-index
agent/references
agent/type
agent/softwarecombine
collector/mitre-cve
source/MITRE
agent/weakness
agent/remedy
agent/author
agent/severity
agent/last-modified-date
agent/description
agent/event
agent/first-publish-date
agent/tags
vendor/facebook
canonical/facebook hhvm
version/facebook hhvm/4.33.0
version/facebook hhvm/4.57.0
version/facebook hhvm/4.58.0
version/facebook hhvm/4.58.1
version/facebook hhvm/4.59.0
version/facebook hhvm/4.60.0
version/facebook hhvm/4.61.0
version/facebook hhvm/4.62.0

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