CVE-2023-0567 password_verify() always returns true for some invalid hashes

2023-02-1606:15:50

php

www.cve.org

php password_verify()

blowfish hashes

invalid hashes

application security

CVSS3

7.7

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

8.1

Confidence

High

EPSS

0.001

Percentile

23.6%

JSON

In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16 and 8.2.X before 8.2.3, password_verify() function may accept some invalid Blowfish hashes as valid. If such invalid hash ever ends up in the password database, it may lead to an application allowing any password for this entry as valid.

CNA Affected

[
  {
    "defaultStatus": "affected",
    "product": "PHP",
    "programRoutines": [
      {
        "name": "password_verify"
      }
    ],
    "repo": "https://github.com/php/php-src",
    "vendor": "PHP Group",
    "versions": [
      {
        "lessThan": "8.0.28",
        "status": "affected",
        "version": "8.0.x",
        "versionType": "semver"
      },
      {
        "lessThan": "8.1.16",
        "status": "affected",
        "version": "8.1.x",
        "versionType": "semver"
      },
      {
        "lessThan": "8.2.3",
        "status": "affected",
        "version": "8.2.x",
        "versionType": "semver"
      }
    ]
  }
]