Home/CVE/When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property arr
CVE

CVE-2020-1900

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property arr

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.

CRITICAL · CVSS 9.8 EPSS 0.00806
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
CWE-416Use After Free
▤

Affected Products & Versions

3
facebook hhvm< 4.32.3
facebook hhvm>= 4.33.0 and < 4.56.1
facebook hhvmall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve-assign@fb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Mar 2021 · 01:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3PatchThird Party Advisory
https://hhvm.com/blog/2020/06/30/security-update.htmlVendor Advisory
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