Snappy vulnerable to PHAR deserialization, allowing remote code execution (KnpLabs snappy)
At a glance
- Source
- NVD
- EPSS
- EPSS 2.76 % · percentile 86 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-502 — Deserialization of Untrusted Data
References
- https://github.com/KnpLabs/snappy/security/advisories/GHSA-gq6w-q6wh-jggc
- https://github.com/KnpLabs/snappy/pull/469
- https://github.com/KnpLabs/snappy/commit/1ee6360cbdbea5d09705909a150df7963a88efd6
- https://github.com/KnpLabs/snappy/commit/b66f79334421c26d9c244427963fa2d92980b5d3
- https://github.com/KnpLabs/snappy/blob/5126fb5b335ec929a226314d40cd8dad497c3d67/src/Knp/Snappy/AbstractGenerator.php#L670
- https://github.com/KnpLabs/snappy/releases/tag/v1.4.2
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-gq6w-q6wh-jggc — PHAR deserialization allowing remote code execution
European references
- ENISA EUVD · EUVD-2023-1015
- GCVE · GCVE-0-2023-28115
Affected configurations (NVD CPE)
cpe:2.3:a:knplabs:snappy:*:*:*:*:*:*:*:*< 1.4.2
Affected products
| Product | Versions |
|---|---|
| KnpLabs · snappy | affected < 1.4.2 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |