Home/CVE/Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument pass
CVE

CVE-2020-1919

Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument pass

Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.

HIGH · CVSS 7.5 EPSS 0.00361
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-125Out-of-bounds Read
CWE-125Out-of-bounds Read
▤

Affected Products & Versions

4
facebook hhvm< 4.56.3
facebook hhvm>= 4.57.0 and < 4.80.2
facebook hhvm>= 4.81.0 and < 4.93.2
facebook hhvmall versions
▣

Scoring & Timeline

7.5
HIGH · 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 NVD10 Mar 2021 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
🔗

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/08193b7f0cd3910256e00d599f0f3eb2519c44caPatchThird Party Advisory
https://hhvm.com/blog/2021/02/25/security-update.htmlRelease NotesVendor Advisory
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