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[email protected]CVE-2021-21703

HistoryOct 25, 2021 - 6:15 a.m.

CVE-2021-21703

2021-10-2506:15:06

CWE-787

CWE-284

[email protected]

web.nvd.nist.gov

1310

cve-2021-21703

php

security

vulnerability

privilege escalation

nvd

6.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

7.1 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

51.1%

JSON

In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.

Affected configurations

NVD

Node

phpphpRange7.3.0–7.3.31

phpphpRange7.4.0–7.4.25

phpphpRange8.0.0–8.0.12

Node

debiandebian_linuxMatch9.0

debiandebian_linuxMatch10.0

debiandebian_linuxMatch11.0

Node

fedoraprojectfedoraMatch33

fedoraprojectfedoraMatch34

fedoraprojectfedoraMatch35

Node

netappclustered_data_ontapMatch-

Node

oraclecommunications_diameter_signaling_routerRange8.0.0.0–8.5.0.2

CPENameOperatorVersion
php:phpphple7.3.31
php:phpphplt7.4.25
php:phpphplt8.0.12

CPE	Name	Operator	Version
php:php	php	le	7.3.31
php:php	php	lt	7.4.25
php:php	php	lt	8.0.12

CNA Affected

[
  {
    "product": "PHP",
    "vendor": "PHP Group",
    "versions": [
      {
        "lessThanOrEqual": "7.3.31",
        "status": "affected",
        "version": "7.3.x",
        "versionType": "custom"
      },
      {
        "lessThan": "7.4.25",
        "status": "affected",
        "version": "7.4.x",
        "versionType": "custom"
      },
      {
        "lessThan": "8.0.12",
        "status": "affected",
        "version": "8.0.X",
        "versionType": "custom"
      }
    ]
  }
]