PT-2020-15149 · Facebook · Hhvm

Published 2020-03-03 · Updated 2020-03-05 · CVE-2020-1893

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions HHVM versions 4.9.0 through 4.45.0 HHVM versions prior to 4.8.7

Description The issue is caused by insufficient boundary checks when decoding JSON in TryParse, which can lead to out of bounds memory reads, potentially resulting in a denial of service (DOS).

Recommendations For HHVM versions 4.9.0 through 4.45.0, update to a version that includes the fix for this issue. For HHVM versions prior to 4.8.7, update to a version that includes the fix for this issue. As a temporary workaround, consider restricting the use of the TryParse function when decoding JSON to minimize the risk of exploitation.

Fix

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2020-1893

Affected Products

Hhvm

References · 7

• https://github.com/facebook/hhvm/commit/bd586671a3c22eb2f07e55f11b3ce64e1f7961e7 · Patch
• https://osv.dev/vulnerability/CVE-2020-1893 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-1893 · Vendor Advisory
• https://hhvm.com/blog/2020/02/20/security-update.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-1893 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-1893 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-1893 · Security Note