CVE-2023-28115 Snappy vulnerable to PHAR deserialization, allowing remote code execution

2023-03-1721:15:25

CWE-502

GitHub_M

www.cve.org

snappy

php library

phar deserialization

remote code execution

version 1.4.2 fix

vulnerable pop chains

laravel

symfony

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

10 High

AI Score

Confidence

High

0.021 Low

EPSS

Percentile

89.1%

JSON

Snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page. Prior to version 1.4.2, Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_exists() function. If an attacker can upload files of any type to the server he can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution especially when snappy is used with frameworks with documented POP chains like Laravel/Symfony vulnerable developer code. If a user can control the output file from the generateFromHtml() function, it will invoke deserialization. This vulnerability is capable of remote code execution if Snappy is used with frameworks or developer code with vulnerable POP chains. It has been fixed in version 1.4.2.

CNA Affected

[
  {
    "vendor": "KnpLabs",
    "product": "snappy",
    "versions": [
      {
        "version": "< 1.4.2",
        "status": "affected"
      }
    ]
  }
]