PT-2021-10267 · Facebook · Hhvm

Jjergus · Published 2021-03-11 · Updated 2021-03-18 · CVE-2020-1900

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: HHVM versions prior to 4.32.3 HHVM versions 4.33.0 through 4.62.0

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 for the specified versions.

Recommendations: For HHVM versions prior to 4.32.3, update to version 4.32.3 or later. For HHVM versions 4.33.0 through 4.62.0, update to a version later than 4.62.0. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2020-1900

Affected Products

Hhvm

References · 8

• https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-1900 · Vendor Advisory
• https://hhvm.com/blog/2020/06/30/security-update.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-1900 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-1900 · Security Note
• https://osv.dev/vulnerability/CVE-2020-1900 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-1900 · Security Note
• https://t.me/cvenotify/11152 · Telegram Post