CVE-2020-1900

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.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://hhvm.com/blog/2020/06/30/security-update.html	Vendor Advisory
https://github.com/facebook/hhvm/commit/c1c4bb0cf9e076aafaf4ff3515556ef9faf906f3	Patch Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:facebook:hhvm::::::::
	cpe:2.3:a:facebook:hhvm::::::::
	cpe:2.3:a:facebook:hhvm:4.57.0:::::::*
	cpe:2.3:a:facebook:hhvm:4.58.0:::::::*
	cpe:2.3:a:facebook:hhvm:4.58.1:::::::*
	cpe:2.3:a:facebook:hhvm:4.59.0:::::::*
	cpe:2.3:a:facebook:hhvm:4.60.0:::::::*
	cpe:2.3:a:facebook:hhvm:4.61.0:::::::*
	cpe:2.3:a:facebook:hhvm:4.62.0:::::::*

Information

Published : 2021-03-10 17:15

Updated : 2021-03-18 07:10

NVD link : CVE-2020-1900

Mitre link : CVE-2020-1900

JSON object : View

CWE

CWE-416

Use After Free

Products Affected

facebook

hhvm

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9.8 /10