What is CVE-2020-1898?

CVE-2020-1898 is a vulnerability in the fb_unserialize function in HHVM that could lead to stack exhaustion due to nested deserialization without a depth limit.

Which software versions are affected by CVE-2020-1898?

CVE-2020-1898 affects HHVM versions 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, and 4.62.0.

What is the severity of CVE-2020-1898?

CVE-2020-1898 has a severity rating of 7.5 out of 10, classified as high.

How can the CVE-2020-1898 vulnerability be exploited?

The CVE-2020-1898 vulnerability can be exploited by utilizing a maliciously constructed string to cause nested deserialization, leading to stack exhaustion.

Are there any patches or security updates available for CVE-2020-1898?

Yes, patches and security updates are available for CVE-2020-1898. It is recommended to update HHVM to version 4.32.3 or newer to fix the vulnerability.

Vulnerability/
CVE-2020-1898

high

7.5

CWE

674

11/3/2021

4/8/2024

CVE-2020-1898

First published: Thu Mar 11 2021(Updated: )

The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. This issue affected 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/1746dfb11fc0048366f34669e74318b8278a684c

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2020-1898?
CVE-2020-1898 is a vulnerability in the fb_unserialize function in HHVM that could lead to stack exhaustion due to nested deserialization without a depth limit.
Which software versions are affected by CVE-2020-1898?
CVE-2020-1898 affects HHVM versions 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, and 4.62.0.
What is the severity of CVE-2020-1898?
CVE-2020-1898 has a severity rating of 7.5 out of 10, classified as high.
How can the CVE-2020-1898 vulnerability be exploited?
The CVE-2020-1898 vulnerability can be exploited by utilizing a maliciously constructed string to cause nested deserialization, leading to stack exhaustion.
Are there any patches or security updates available for CVE-2020-1898?
Yes, patches and security updates are available for CVE-2020-1898. It is recommended to update HHVM to version 4.32.3 or newer to fix the vulnerability.

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collector/mitre-cve
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agent/author
agent/severity
agent/last-modified-date
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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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